JP2001234505A - Road reinforcing sheet, structure of asphalt-reinforced paved road, and method of paving road - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thin-layer pavement, which displays remarkably excellent durability to a rutting and cracking and in which the thickness of an asphalt layer is thinned particularly. SOLUTION: In the paved road constituted, containing a reinforcing sheet layer (1A) and a paving layer (22), the reinforcing sheet layer (1A) is configured in such a manner that continuous glass fiber is used as reinforcing fiber and a reinforcing sheet (1) composed, containing a composite material impregnated with a thermoplastic resin so that the volume content of the continuous glass fiber reaches 30-85% is used and an asphalt layer (2) laminated on at least one surface is comprised.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road-reinforcing sheet capable of significantly improving the durability against cracking and rutting caused by vehicle traffic on an asphalt-paved road, and an asphalt-reinforced pavement using the road-reinforcing sheet. In particular, the present invention relates to a road reinforcing sheet which is effective for reinforcing and thinning an asphalt-paved road, and the asphalt-reinforced paved road. Furthermore, the present invention relates to a pavement method enabling a thin pavement of a road and a method of repairing a pavement road.

[0002]

2. Description of the Related Art In recent years, damage to road pavement has become apparent due to an increase in traffic volume of a road and a traffic volume of a large vehicle, resulting in impaired driving safety and comfort. In particular, heavy pavement road pavement is severely damaged by rutting and cracking due to asphalt flow, and repair work is frequently performed to ensure traffic safety, which has become a social problem. Also, when cracks occur on the pavement of the road, rainwater infiltrates there, further damaging the roadbed, and promoting cracks. In bridge surface pavement, not only does the water penetrating into the reinforced concrete slab from the bridge surface through the asphalt pavement not only corrode the reinforcing steel and steel inside the slab, but also deteriorate the concrete, especially the slab concrete under repeated loading. Promotes load-bearing capacity and durability.

Various methods have been proposed to improve the rutting and cracking of these road pavements. As a general method, asphalt mixture used for asphalt pavement has a high flow resistance and abrasion resistance and is effective for rut digging, and a cutting overlay using asphalt that has high crack resistance and is effective for preventing cracking There is a construction method. However, these methods are not effective methods for suppressing both rutting and cracking on asphalt pavement surfaces, and do not significantly extend the service life of paved roads at present.

[0004] Various methods and compositions have been proposed to enhance the overlay of asphalt pavement. For example, JP-A-62-268413 and JP-A-64-144
As shown in Japanese Patent Publication No. 15, there is a so-called geotextile method. In the geotextile method, a geotextile is laid on a roadbed, and a granular material such as embankment material or gravel is laid thereon to form a pavement roadbed, thereby dispersing and supporting a load applied to the pavement. However, this method has almost no effect on damage such as rutting and cracking that occurs on the asphalt pavement surface.

[0005] Further, a method has been proposed in which the shear force inside the asphalt mixture is restrained in asphalt pavement using geotextile to reinforce the asphalt mixture. For example, a product using a grid made of a uniaxially / biaxially stretched synthetic resin or a product using a grid made of a strand in which a resin is impregnated into glass fiber is used as a product aimed at improving the reinforcing performance of an asphalt mixture. is there.

However, the tensile strength of the synthetic resin grid at the stretched portion of the grid is as low as 0.4 GPa, and it is necessary to increase the basis weight to reinforce the asphalt mixture. Grids using glass fibers also have the disadvantage that the tensile strength is reduced due to cutting of the fibers due to wear and hooking during asphalt pavement.

Further, these glass fiber grids and synthetic resin grids having high rigidity have a high rigidity as a geotextile in order to increase the material strength, and cannot be continuously unwound during construction. Surface handling is difficult.

Further, since this geotextile is used sandwiched between the lower layer and the upper layer of asphalt, it is necessary to prevent slippage between the upper layer and the lower layer and enhance the bonding strength. The geotextile is therefore grid-shaped.
As a result, it has a drawback that it is not possible to prevent the collapse of the roadbed and subgrade due to cracks occurring on the asphalt pavement surface or rainwater entering from the damaged portion.

In order to solve the above problems, the present inventors have made intensive studies, and as a result, have disclosed in
By using the sheet for reinforcing roads described in Japanese Patent No. 7014, the asphalt pavement is strengthened, and the penetration of rainwater or the like is effectively prevented, so that the reflection crack,
And it has been found to exert a great effect on cracks in the asphalt surface layer.

According to the publication, the road reinforcing sheet is compatible with the asphalt pavement, and the asphalt of the road reinforcing sheet is melted at the asphalt mixture temperature (usually 110 ° C. or higher) at the time of construction to form a good bond with the asphalt pavement. Form and integrate surfaces. By exhibiting this adhesive effect, the road reinforcing sheet suppresses the flow of the asphalt pavement, reduces the deflection of the pavement, and suppresses the rutting and cracking phenomena. As a result, it is described that cracking and rutting phenomena occurring on the road surface exhibit twice or more the durability of a normal pavement.

The road reinforcing sheet disclosed in the publication also has a waterproof function as a composite waterproof sheet as shown in Japanese Patent Application No. 07-083678, and has a reflection crack preventing performance.
It also has waterproof performance such as pavement on a bridge. However, asphalt pavement has been more and more damaged due to an increase in automobile traffic and an increase in the size of a truck in recent years. In addition, the demand for paved roads from road users and residents along the roads has diversified, and the pavement has special features that are excellent in durability, and that consider traffic safety, environment, cost reduction, and long life. And various high-performance pavement materials have been developed. Examples include drainage pavement with drainage function and noise reduction function, thin asphalt pavement, recycled asphalt compound using recycled aggregate, slag that melts and cools incinerated ash of general waste as aggregate, waste Recently, hot asphalt mixtures, which are obtained by mixing crushed glass, waste plastic and waste plastic bottles, have attracted attention.

For example, regarding drainable pavement, a drainage pavement technical guideline (draft) has been published. High-viscosity asphalt is used as a binder for asphalt mixture used for drainage pavement, and rubber-containing asphalt emulsion is used as a tack coat. Is usually used.

[0013] For the asphalt pavement using the asphalt mixture, even if the road reinforcing sheet described in JP-A-09-177014 is used, cracks and rut digging generated on the asphalt pavement surface can be prevented. May not be fully effective.

The present inventors have conducted further research on materials, production methods, and the like that can cope with such various high-performance pavement materials and can also solve these problems.

[0015] It is an object of the present invention to provide a pavement road in which the above disadvantages are eliminated.

One of the major objects of the present invention is to reduce the amount of asphalt used for paving,
That is, it is to enable a thin-layer pavement in which the thickness of asphalt is reduced.

The thickness of asphalt used for pavement on roads is described in various guidelines and documents. For example, asphalt pavement outline (1975 version, 6-19
According to the Japan Road Association, the thickness of the surface asphalt is designed according to the traffic volume of the vehicle. A (traffic volume less than 250 vehicles / day): Surface asphalt 5 cm, B (250-1000 vehicles / day): Surface asphalt 5cm, C (1000-3000 units / day): Surface asphalt 10cm, D (3000 units / day or more): Surface asphalt 15cm *, * including base layer Asphalt pavement basic course; Design of asphalt pavement (day According to Hitachi Chemical Co., Ltd., it is stated that "in general, asphalt mixtures are finished in a single layer up to a thickness of 6 cm, and when the thickness is larger, they are finished in multiple layers based on a thickness of 5 cm." ) "If the total of the surface layer and the base layer is 10 cm as standard and the vehicle traffic volume per unit section is less than 2000 vehicles / day, It is described that it is possible to make a surface layer having a thickness of 5cm on base course omitted. "

Japanese Patent Application Laid-Open No. 9-177014 is a patent using a reinforcing sheet, and it is described that the strength of the road is improved by using the reinforcing sheet. Only the test results are listed.

It has been considered that it is very difficult to make the thickness of the surface asphalt thinner than 5 cm from the above design values and the like. As described above, with respect to road pavement, the problem of reducing the thickness of asphalt in the surface layer was not considered due to long-term customs or the provisions of construction guidelines, etc., which were 5 cm or more.

When the thickness of the asphalt is large, it takes a long time for the construction and the amount of asphalt to be used becomes enormous.

Further, asphalt cutting is necessary for repairing roads and changing asphalt, and the cutting generates noise and dust, which inevitably inconveniences residents along the road. There are also regulatory restrictions.

If the thickness of asphalt is large, the construction period is prolonged, the amount of cut asphalt waste is increased, and the construction period is prolonged due to the prolonged traffic cut-off period, the prolonged bad environment for roadside residents, and the cost of road construction. There is a problem that the impact on the economy and the environment is large, such as the increase in cost. Mitigating these is a critical issue.

[0023]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems and provides a road reinforcing sheet capable of significantly reducing damage such as rutting and cracking that occurs on the surface of asphalt pavement, and asphalt reinforcement using the road reinforcing sheet. It is an object of the present invention to provide a road reinforcing sheet effective for reinforcing and thinning a pavement road, particularly an asphalt pavement road, and to provide the asphalt reinforced pavement road.

[0024]

Means for Solving the Problems The present inventors have made intensive studies to achieve the above object, and as a result, have completed the present invention. That is, the present invention includes the following inventions.

(A) A pavement road including a reinforcing sheet layer (1A) and a pavement layer (22), wherein the reinforcing sheet layer (1A) uses continuous glass fibers as reinforcing fibers. Glass fiber volume content of 30% or more 8
A reinforcing sheet (1) comprising a composite material impregnated with a thermoplastic resin so as to have a concentration of 5% or less, and an asphalt layer (2) laminated on at least one surface of the reinforcing sheet (1). And paved road.

(B) The reinforcing sheet layer (1A) further comprises:
A reinforcing sheet layer (1B) having a woven or nonwoven fabric layer (3) containing natural fibers or synthetic fibers on at least a part of the surface between the reinforcing sheet (1) and the asphalt layer (2). The paved road according to (A), wherein

(C) A paved road comprising a reinforcing sheet layer (1A) and a paving layer (22), wherein the reinforcing sheet layer (1A) uses continuous glass fibers as reinforcing fibers. Glass fiber volume content of 30% or more 8
A reinforcing sheet (1) comprising a composite material impregnated with a thermoplastic resin so as to be 5% or less, and an asphalt layer (2) laminated on both sides of the reinforcing sheet (1). (A).

(D) The reinforcing sheet (1) has a tensile strength at break of 290 MPa or more, a tensile elongation at break of 10% or less, a coefficient of thermal expansion of 2 × 10 ⁻⁶ to 8 × 10 ⁻⁶ / ° C., and a thickness of 10%.
(A) characterized in that the thickness is 0 μm to 600 μm.
(C) The paved road according to any one of the above.

(E) The thickness of the asphalt layer (2) is 4
The paved road according to any one of (A) to (D), which is not less than 00 μm and not more than 2,000 μm.

(F) When the reinforcing sheet (1) and the asphalt layer (2) are subjected to shear peel strength, the layers are bonded with a strength equal to or higher than the cohesive force of the asphalt layer (2). A paved road according to any one of (A) to (E).

(G) The thickness of the paving layer (22) is 50 mm
And the breaking energy by the bending test is 4
The pavement road according to any one of (A) to (F), which has a remarkably thin pavement layer of not less than [kN · mm] and a function remarkably excellent in crack resistance. .

(H) The thickness of the paving layer (22) is 50 mm
Less than and a dynamic stability by wheel tracking test of 600 [times / mm] or more, having both a remarkably thin pavement layer and a function with remarkably excellent rut resistance. The pavement road according to any one of (A) to (G), characterized in that:

(I) the pavement layer (22) is drainable,
And the reinforcing sheet layer (1A or 1B) is water-blocking,
(A)-(A) is characterized in that it has a drainage function in the road shoulder direction along the upper surface of the reinforcing sheet layer (1A or 1B) without the rainwater permeating the pavement layer (22) penetrating into the roadbed. H) The paved road according to any one of the above.

(J) The thickness of the paving layer (22) is 4.5c.
m. The paved road according to any one of (A) to (I), wherein m is equal to or less than m.

(K) The thickness of the paving layer (22) is 4-1.
The paved road according to (J), which is 5 cm.

(L) The reinforcing sheet layer (1A or 1B) according to any one of (A) to (C) is laid, and the road reinforcing sheet is the surface layer of the road without laying asphalt thereon. Construction.

(M) Road works in which the reinforcing sheet layer (1A or 1B) according to any one of (A) to (C) is laid, and the reinforcing sheet layer is a surface layer without laying asphalt thereon. Temporary road structure used inside.

(N) In the case where cracks, ruts, or defects occur on the pavement surface of a road paved with asphalt or concrete, at least a part of the surface of the pavement road is cut, and if necessary, the cracks or defects are removed. A method for repairing a pavement road, comprising providing the structure of the pavement road according to any one of (A) to (K) after the partial repair.

(O) On a road paved with asphalt or concrete, after cutting the surface and partially repairing cracks or defective portions, a paved road structure having a drainage function in the direction of the road shoulder described in (I) is provided. A method for repairing a pavement road, characterized in that:

[0040]

BEST MODE FOR CARRYING OUT THE INVENTION Tensile breaking strength is 290 MPa or more, tensile breaking elongation is 10% or less, and thermal expansion coefficient is 2 × 10 5
⁻⁶ to 8 × 10 ⁻⁶ / ° C., thickness 100 μm to 600 μ
m having a thickness of 400 μm on both sides of the reinforcing sheet (1).
A road reinforcing sheet characterized in that an asphalt layer (2) having a size of 2,000 μm is bonded to the reinforcing sheet (1) at a shear peel strength equal to or higher than the cohesive force of the asphalt layer (2), and the road reinforcing sheet. The present invention relates to a structure of an asphalt reinforced pavement road in which crack performance and rut digging resistance are remarkably improved, which are laid at a depth of less than 5 cm from the asphalt surface side of the asphalt pavement to be reinforced.

The pavement road of the present invention has remarkably excellent crack resistance, and has a breaking energy of 4 [kN · mm] by a bending test.
The above is obtained, and usually about 4-40 [kN · mm] is obtained. It also has excellent wheel tracking properties and dynamic stability of 600 times / mm or more, usually 600 to
About 15,000 times are obtained.

Crack performance, wherein the road reinforcing sheet is laid at a depth of less than 5 cm, preferably less than 4.5 cm, more preferably 4 to 1.5 cm from the asphalt surface side of the asphalt pavement to be reinforced, To provide an asphalt reinforced pavement structure with significantly improved rut resistance. The invention also includes temporary roads that are used during road construction where the road reinforcement sheet is a surface layer without laying a road reinforcement sheet and asphalt thereon.

Hereinafter, the structure of the road reinforcing sheet of the present invention and the structure of the asphalt reinforced pavement road using the road reinforcing sheet will be described in detail with reference to the drawings.

The reinforcing sheet (1) of the present invention has a tensile strength at break of 290 MPa or more, a tensile elongation at break of 10% or less, a coefficient of thermal expansion of 2 × 10 ⁻⁶ to 8 × 10 ⁻⁶ / ° C., and a thickness of 1%.
It is a sheet having a size of from 00 μm to 600 μm, and is not particularly limited as long as it has these properties.
For example, a thin metal or a composite material may be used.
It is preferable to select a reinforcing sheet (1) that can bond to the asphalt layer (2) with a cohesive strength higher than the asphalt layer (2). From such a viewpoint, it is preferable to use a composite material composed of a reinforcing fiber and a polymer resin for the reinforcing sheet (1).

When a composite material is used as the reinforcing sheet (1) of the present invention, the reinforcing fibers used are not particularly limited, but for example, glass fibers, carbon fibers, aramid fibers, silicon carbide fibers and the like are typical. Things. Particularly preferred fibers include glass fibers, and more preferably continuous glass fibers.

The thermoplastic resin used for the reinforcing sheet (1) of the present invention is not particularly limited, and examples thereof include polypropylene, polyethylene, ethylene-propylene copolymer, α-olefin homopolymer and copolymer, and the like. Uses polyolefin resins, homopolymers such as styrene and methylstyrene, polystyrene resins such as copolymers of these with α-olefins, and polyvinyl chloride resins such as homopolymers of vinyl chloride and copolymers of α-olefins You can do it. Other, A
S resin, ABS resin, ASA resin (polyacrylonitrile / polystyrene / polyacrylate), polymethyl methacrylate, nylon, polyacetal, polycarbonate, polyethylene terephthalate, polyphenylene oxide, fluororesin, polyphenylene sulfide, polysulfone, polyether sulfone, Various resins such as polyetherketone, polyetheretherketone, polyimide, and polyarylate can also be used.However, from the viewpoints of strength, abrasion resistance, price, and ease of recycling when it becomes waste, As a desirable resin,
General-purpose polyolefin resins such as polyethylene and polypropylene, polystyrene resins, polyvinyl chloride resins, and nylon are recommended.

When a composite material is used as the reinforcing sheet (1) of the present invention, the volume content of the reinforcing fibers should be 30% or more and 85% or more.
%, Preferably 30% or more and 80% or less.

The thickness of the reinforcing sheet (1) of the present invention is preferably from 100 μm to 600 μm, and more preferably from 150 μm to 550 μm, considering the strength and flexibility of the sheet.
m. When the thickness of the reinforcing sheet (1) is 100 μm or more, sufficient strength is obtained. When the thickness is less than 600 μm, the flexibility of the sheet is appropriate, and the workability as a road reinforcing sheet is good.

The reinforcing sheet (1) of the present invention is 10% tensile elongation at break less, the thermal expansion coefficient of ^{2 × 10 - 6 ~8 × 10} -6 /
Various methods can be used to achieve both the performances of ° C. When a composite material is used as the reinforcing sheet (1),
It is preferable to use a reinforcing sheet (1) in which continuous reinforcing fibers are arranged in one direction and a plurality of sheets impregnated with a thermoplastic resin are orthogonally laminated.

The method for producing the sheet impregnated with the thermoplastic resin used in the method of the present invention is not particularly limited as long as it has the above-mentioned physical properties. For example, the method described in the claims and examples of Japanese Patent Publication No. 4-42168 is not limited. It can be manufactured by the method described.

According to claim 1 of the publication, the thermoplastic resin is applied to at least one of a pair of belts heated to a temperature higher than the softening point of the thermoplastic resin, and the coating film is applied between a pair of belts facing each other. The method of producing a fiber-reinforced sheet-like prepreg by impregnating fibers with a thermoplastic resin by passing a fiber sheet between the pair of belts, and more specifically, a method subordinate to this is disclosed. I have. More specifically, as shown in FIG. 1, the publication is composed of a fiber feeding section, a supply section, a resin impregnating section, and a take-up section, and the detailed description shows the details of FIG.

The prepreg used in the present invention is disclosed in
No. 177014.

In the prepreg of the present invention, the reinforcing fibers are such that continuous filaments continuous in one direction are arranged almost uniformly. As the fiber used for the prepreg, for example, glass fiber,
Representative examples include carbon fibers, aramid fibers, and silicon carbide fibers, but are not limited thereto. Particularly preferred fibers include glass fibers.

As the fiber, a yarn or roving obtained by bundling 200 to 12,000 monofilaments having a thickness of 3 to 25 μm is usually arranged in a predetermined number in one direction. When the fibers are glass fibers, various surface treatments are usually performed to improve the adhesion to the resin. As a specific example of a prepreg production method in which the surface treatment is performed by combining a sizing agent and a coupling agent, for example,
There is a method disclosed in JP-A-4-042168. According to this method, in the case of glass fiber, for example, the surface of a monofilament having a thickness of 13 μ is treated with γ-methacryloxy-propyltrimethoxysilane and
No yarn is bundled into a yarn without twist, and the yarn is 80
The resin can be manufactured by arranging the resin in one direction while pulling the resin under uniform tension, wrapping the resin in the yarn, and squeezing the resin with a hot roll while impregnating the yarn.

Further, more specifically, JP-A-9-177
No. 014 (0032) describes a method for producing a prepreg,
(0034) describes a method for producing a reinforced sheet, and a sheet produced by this method can be used.
Preferably, the reinforcing fibers are glass fibers and the resin is polypropylene. For example, "Preglon" (trade name) manufactured by Mitsui Chemicals, Inc. can be used.

The reinforcing sheet (1) of the present invention may be provided with a woven or nonwoven fabric (3) made of fibrous material on one or both sides of the entire surface or a part thereof. In this case, the woven or nonwoven fabric (3) used for the reinforcing sheet (1) is generally made of natural fibers, for example, fibers such as cotton and hemp as plant fibers, wool and silk as animal fibers, and asbestos as mineral fibers. And high-molecular-weight fibers and high-molecular-weight fibers, such as high-density polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polystyrene, polyvinyl alcohol, polyester, nylon, and various copolymers thereof. Merging can be used. Considering the processing temperature at the time of producing the reinforcing sheet (1) and the processing temperature at the time of providing the asphalt layer (2) thereafter, a woven or non-woven fabric made of polyester and various copolymers thereof is preferable. That's not true.

The basis weight per unit area of the fibrous woven or nonwoven fabric (3) used in the present invention is 10 g.
/ M2 to 500 g / m2 can be used.
5 g / m2 to 60 g / m2. By using such a fibrous woven or nonwoven fabric, the fibrous portion is impregnated with asphalt to improve the adhesive strength and the durability of the road reinforcing sheet itself.

The road reinforcing sheet of the present invention can be obtained by heat-welding an asphalt layer (2) on both sides of the above-mentioned reinforcing sheet (1).

As the material constituting the asphalt layer (2) used in the present invention, straight asphalt, blown asphalt, modified asphalt and the like can be mainly mentioned, and modified asphalt is particularly preferred. The asphalt layer (2) used in the present invention is not particularly limited as long as the asphalt is within this condition.

To this modified asphalt, in addition to semi-blown asphalt whose viscosity has been increased by oxidative polymerization by blowing air at a high temperature into straight asphalt, modifiers such as rubber and thermoplastic elastomer were added to increase the viscosity at 60 ° C. Such asphalt can be used in the present invention. Rubber, resin, and the like are used as the modifier for the modified asphalt. The rubber used as the additive is usually a synthetic rubber, styrene-butadiene rubber, styrene-butadiene block polymer, styrene-butadiene copolymer,
There are chloroprene butadiene nitrile copolymer, isobutylene isoprene copolymer and the like. The amount of rubber added is generally from 2 to 5% by weight. In addition, there are styrene / isoblock polymer, ethylene / vinyl acetate copolymer (EVA) and ethylene / ethyl acrylate copolymer (EEA).

By using modified asphalt for the asphalt layer (2) in the road reinforcing sheet of the present invention, the asphalt layer (2) of the road reinforcing sheet of the present invention has a temperature of 60 ° C.
Increased viscosity improves flow resistance, adhesion to non-adhesives, and toughness. As a result, the reinforcing sheet (1)
And the asphalt layer (2) are further improved in adhesion. Further, as described above, the performance of the asphalt layer (2) is improved, so that the road reinforcing sheet is firmly adhered to the asphalt pavement, the base adherend, and the like, and the mechanical performance of the reinforcing sheet (1) is reduced by the asphalt structure. It can be applied to the body, and it is possible to efficiently suppress rut digging and cracking occurring on the asphalt pavement road.

The thickness of the asphalt layer (2) of the present invention is as follows:
Usually it can be 300 μm to 4000 μm,
Preferably it is 400 μm to 2000 μm. When the thickness of the asphalt layer (2) is 300 μm or more, the amount of asphalt in the asphalt layer (2) is appropriate, the layer can be formed, and the adhesion with the base layer during construction is good.
Further, when the thickness of the asphalt layer (2) is 4000 μm or less, there is no problem of air bleeding, thickness unevenness, surface property, and the like when manufacturing the road reinforcing sheet, and the asphalt layer (2) can be formed. The road reinforcement sheet is flexible, has a proper weight, and has good workability during construction.

The method for producing the road reinforcing sheet of the present invention includes heating the reinforcing sheet (1) above the melting temperature of the thermoplastic resin used for the reinforcing sheet (1), and adding the reinforcing sheet (1) to asphalt. The layer (2) is melted or mixed, solidified, and integrally laminated.

In the case where a woven or nonwoven fabric made of fibrous material is disposed on the entire surface or on one or both sides of the reinforcing sheet (1), the thermoplastic resin is similarly used on the fibrous portion. And asphalt are melted or mixed with each other, solidified, and integrally laminated. At this time, at the interface between the thermoplastic resin and the asphalt, a state where the thermoplastic resin and the asphalt are melted or mixed with each other and solidified is formed in the fibrous material, and has a kind of composite material configuration. As a result, the adhesive strength between the reinforcing sheet (1) and the asphalt layer (2) is improved, and the durability of the road reinforcing sheet itself is further improved.

As a method for producing a road reinforcing sheet, generally, the reinforcing sheet (1) is heated to a temperature not lower than the melting temperature of the thermoplastic resin used for the reinforcing sheet (1), or is melted without heating. There are a method of dipping on asphalt, a method of roll coating, and the like. The asphalt layers (2) are melted or mixed with each other on both surfaces of the target reinforcing sheet (1) to form a solidified state and are integrated. The production method is not particularly limited as long as a heat-sealed sheet can be obtained.

The road reinforcing sheet of the present invention has a tensile strength at break of 290 MPa or more, a tensile elongation at break of 10% or less, a coefficient of thermal expansion of 2 × 10 ⁻⁶ to 8 × 10 ⁻⁶ / ° C., and a thickness of 10%.
A reinforcing sheet (1) having a size of 0 μm to 600 μm is used as a constituent material. As an example, when a reinforcing sheet (1) in which reinforcing fibers in which a reinforcing sheet (1) is continuous is arranged in one direction and a plurality of sheets impregnated with a thermoplastic resin are orthogonally laminated is used,
The tensile strength of the road reinforcing sheet is 49 per meter.
It has a strength of kN or more and a tensile elongation at break of 10% or less.

The road reinforcing sheet has a thickness of 400.
Since the outermost layer has an asphalt layer (2) having a thickness of from μm to 2,000 μm, the adhesiveness to an object to be bonded such as an asphalt mixture or a concrete floor slab, which is a constituent of pavement, becomes extremely high. In addition, the asphalt layer (2) of the road reinforcing sheet of the present invention is bonded to the reinforcing sheet (1) at a shear peel strength equal to or higher than the cohesive force of the asphalt layer (2). By combining with the mixture, it is possible to form a state in which the reinforcing sheet (1) is firmly bonded to the asphalt mixture, the concrete slab, etc., which are the adherends, and thus the mechanical performance of the reinforcing sheet (1) Can be imparted to the asphalt structure, the strength of the asphalt pavement can be improved, cracks generated on the asphalt pavement can be reduced, and rut digging due to the flow of the asphalt mixture can be suppressed.

In the road reinforcing sheet of the present invention, since the asphalt layer (2) is bonded to the reinforcing sheet (1) at a shear peel strength equal to or higher than the cohesive force of the asphalt layer (2), Is strongly bonded to the asphalt mixture, the concrete floor slab, and the like, and the mechanical performance of the reinforcing sheet (1) can be efficiently expressed. It is possible to open traffic as a temporary road without paving the asphalt mixture.

In the present invention, when a reinforcing sheet in which continuous reinforcing fibers are arranged in one direction as the reinforcing sheet (1) and a plurality of sheets impregnated with a thermoplastic resin are orthogonally laminated is used, this effect is further enhanced. Become.

Next, the structure of an asphalt reinforced pavement using the road reinforcing sheet of the present invention will be described. The structure of ordinary asphalt pavement consists of a roadbed and a base layer (5) on the subgrade.
And the surface layer (4), but the surface layer (4) may be directly laid on the roadbed (6) without the base layer (5).
In addition, when the ground is soft ground, etc., asphalt stabilization method is performed in which asphalt (straight asphalt, asphalt emulsion, cutback asphalt, etc.) is added to a local material or a material obtained by adding a supplementary material thereto on a subgrade to treat the material. In some cases. The subgrade is a part with a thickness of 1m under the pavement.
In the cut area, this is the part 1 m below the excavated surface. The subgrade is the basis for determining the thickness of the pavement.

The roadbed is a layer that distributes the traffic load and safely transmits it to the roadbed. Therefore, the material must have a sufficient supporting force and be made of a highly durable material and compacted to the required thickness. In order to make the roadbed economically and mechanically balanced, the lower roadbed (7) using an inexpensive material having a relatively small bearing capacity and the upper roadbed (7) using a high-quality material having a large supporting force are usually used. 8) The materials used for the lower subgrade (7) and the upper subgrade (8) are local materials, crushed crushed stone, crusher lances,
It is mountain gravel, cut gravel or sand.

The surface layer (4) and the base layer (5) are the parts most affected by traffic loads and weather effects, and use a heated asphalt mixture. As the type of the heated asphalt mixture, coarse-grained asphalt concrete is used for the base layer (5), and fine-grained asphalt concrete, fine-grained asphalt concrete, and dense-gap asphalt concrete are used for the surface layer (4). In recent years, drainage asphalt mixtures have been used to reduce noise and remove rainwater on road surfaces. The selection of the asphalt mixture used for the surface layer (4) and the base layer (5) of the present invention is determined in consideration of weather conditions, traffic conditions, construction conditions, and the like, and is not particularly limited.

As the structure of the asphalt reinforced pavement road of the present invention, a road reinforcing sheet is laid on a cut road surface (13) or a roadbed (6), and a base layer (5) and a surface layer (4) are laid in this order. Alternatively, there are a case where only the surface layer (4) is laid, and a case where a road reinforcing sheet is laid on the base layer (5) and the surface layer (4) is laid. This includes the construction of roads, the use of road-reinforcement sheets (for example, suppressing cracks on asphalt pavement surfaces, suppressing rut digging due to asphalt flow, reinforcing drainage asphalt mixtures, reinforcing thin pavement, asphalt It is determined in consideration of construction conditions, etc., such as laying a waterproof layer under the pavement.

As a method of forming the structure of the asphalt-reinforced pavement road of the present invention, a method of applying a hot-melted asphalt to an adherend on which a road-reinforcing sheet is laid is applied while flowing the asphalt on the surface of the road-reinforcing sheet using a torch burner. There is a method of melting and attaching to the adherend, a method of attaching to the adherend by the heat of asphalt mixture used for asphalt pavement, etc., but it is possible to adhere with sufficient strength to the adherend. If so, it doesn't matter how.

A typical example of the method for forming the structure of the asphalt reinforced pavement road of the present invention is shown below, but the present invention is not limited to the following example.

When cracks on the asphalt pavement surface are suppressed by using the road reinforcing sheet, the asphalt melted by heating is poured on the cut road surface (13) to close the cracks on the road surface and level the unevenness of the road surface while the road reinforcing sheet is leveled. Laying.

After laying the road reinforcing sheet, the surface layer (4)
When assembling, the temperature of the asphalt mixture must be 11
The temperature must be 0 ° C. or higher. If the temperature is lower than 110 ° C, do not apply. After laying down the surface layer (4), heat is transmitted to the base layer (5) by using an iron wheel roller and a tire roller for compaction, the asphalt is melted, and the base layer (5), the road reinforcing sheet and the surface layer (4) are further melted. ) Are firmly integrated.

When pavement having extremely excellent rutting performance is performed using the road reinforcing sheet, the road reinforcing sheet is laid on the base layer (5). In this case, first, as the base layer (5),
For example, a coarse-grained asphalt mixture is spread on a roadbed (6) with an asphalt finisher or the like, and after compaction using an iron wheel roller or a tire roller, the road reinforcing sheet is laid. As a method of laying the road reinforcing sheet and affixing the non-adhesive body thereto, the road reinforcing sheet is laid while flowing asphalt heated and melted on the road surface, or the temperature of the base layer (5) after pressing and rolling is 110 If the temperature is higher than ° C., there is a method in which a road reinforcing sheet is directly laid, the sheet is melted by the heat of the base layer (5), and the sheet is bonded to the base layer (5) and laid. However, when the temperature of the base layer (5) after pressing and rolling is 110 ° C. or lower, the road reinforcing sheet is heated by directly heating the road reinforcing sheet by an open flame such as a torch burner and melting the sheet to adhere to the base layer (5). Will be laid. When the surface layer (4) is laid after completion of the laying of the road reinforcing sheet, the temperature of the asphalt mixture must be 110 ° C. or more. If the temperature is lower than 110 ° C, do not apply. After laying down the surface layer (4), heat is transmitted to the base layer (5) by using an iron wheel roller and a tire roller for compaction, the asphalt is melted, and the base layer (5), the road reinforcing sheet and the surface layer (4) are further melted. ) Are firmly integrated.

In order to significantly improve the performance of suppressing cracks generated on the surface of a pavement road and suppressing rut digging caused by asphalt flow, which is the main feature of the present invention, the position at which a road reinforcing sheet is laid is adjusted, and It is necessary to adjust and lay the thickness of the asphalt mixture layer on the reinforcing sheet. That is, in order to greatly improve the performance of suppressing cracks generated on the surface of a pavement road, it is preferable to lay a road reinforcing sheet at a location close to the source of the crack. In addition, in order to greatly improve the rut digging suppression performance due to the flow of asphalt, it is preferable to lay the road reinforcing sheet at a position close to the asphalt surface of the surface layer (4), and 4 cm from the asphalt surface of the surface layer (4). It is more preferable to lay the road reinforcing sheet at a location less than the above.

In recent maintenance and repair of asphalt-paved roads, as a temporary measure for repairing rut digging and cracks generated on the asphalt pavement surface, a method of injecting asphalt compound into a damaged portion is generally employed. . However, this repair method is not an essential repair but a temporary solution, which may cause damage to the asphalt pavement surface over time. Therefore, generally, these asphalt-paved roads are evaluated, and construction using a reshaping method, a cutting overlay method, or the like is employed.

However, if the replacement work is performed, the construction period is long, noise is generated, and the construction cost is high.
There are problems such as a large amount of waste material, a great deal of cost for the processing problem, and a large amount (cost) of material (for example, asphalt mixture) used for replacement.

Also, when the cutting overlay method is used, the construction period is long, the construction cost is high, the amount of waste material (cutting waste) is large, and the processing problem is extremely expensive. There is a problem that it costs (cost). Even in view of these problems, forming an asphalt reinforced pavement road using the road reinforcing sheet of the present invention is an effective means for the construction period, construction cost, and the like. That is, forming an asphalt reinforced pavement using the road reinforcing sheet of the present invention has the following advantages.

The road reinforcing sheet of the present invention is firmly bonded to an asphalt mixture, a concrete slab, or the like used for an asphalt pavement road, so that the mechanical performance of the reinforcing sheet (1) can be imparted to the asphalt structure. It improves the strength of asphalt pavement, reduces cracks that occur on asphalt pavement, and suppresses rut digging due to the flow of asphalt mixture. For this reason, it becomes possible to reduce the amount and thickness of asphalt laid on the road reinforcing sheet of the present invention. Therefore, the thickness when cutting the damaged asphalt pavement surface can be reduced only to the surface portion of the damaged portion, which leads to a reduction in the amount of waste material (cutting waste), a reduction in cost, and a reduction in the construction period.

The structure of the road reinforcing sheet according to the present invention and the asphalt-reinforced pavement road using the road reinforcing sheet are three times or more and 1.5 times or less, respectively, as compared with ordinary roads with respect to rutting and cracking of asphalt pavement occurring on the road surface. It is a structure of a road reinforcing sheet and asphalt reinforced pavement road which has excellent performance indicating twice or more durability and is useful for economy, environmental resistance, etc. in maintenance and repair work of asphalt pavement.

Hereinafter, the present invention will be described more specifically with reference to the drawings and embodiments, but the present invention is not limited to the following embodiments.

The various test methods used in the present specification were carried out in accordance with the “Pavement Test Method Handbook” (published by the Japan Road Association, the first edition of the 14th printing on November 16, 1998). The main test methods are shown below.

Bending test The bending test was carried out as shown in FIG. 15 by using a reinforcing sheet layer and an asphalt layer (honey grain 13 mm-straight asphalt: 6).
0/80 parts) 50mm x 50mm x 300mm
Was measured at −10 ° C. at a load speed of 50 mm / min. Arrows indicate loads.

Breaking energy in bending test The area under the load-deformation curve in the bending test up to the peak load was defined as the breaking energy.

The peak load is determined by referring to "Bending Fracture Properties and Tensile Softening Curve of Steel Fiber Reinforced Concrete"("Journal of the Japan Society of Civil Engineers: 1993, No. 2, 460V-18, p. 57") and the load-deformation amount. The measurement of the area under the curve up to the peak load in the curve is as follows: (1) “Characteristics of glass fiber reinforced cement”: Composite material technology integrated II-6-6 glass fiber reinforced cement (GRC) (2) “Glass fiber reinforced concrete Characteristics of (GRC) ": Journal of the Society of Composite Materials, Japan, Vol. 13, No. 2, (1987)
Year) page 58 Wheel tracking test (dynamic stability) As shown in FIG.
m-straight asphalt: 60/80 parts)-300 mm x 30 made of asphalt mixture (straight asphalt, modified asphalt, drainage asphalt, etc.)
Using a sample piece of 0 mm x 50 mm, 60 ° C, load 70 kg
f, Measured at a loading speed of 42 pass / min. The measurement was 50 mm from the surface layer or 30 mm from the surface layer (the base layer was 20 mm).
mm). Arrows indicate the direction of load movement.

[0090]

EXPERIMENTAL EXAMPLE 1 Production of Road Reinforcement Sheet [Production of Road Reinforcement Sheet] A road reinforcement sheet in which an asphalt layer (2) is laminated on both sides of a reinforcement sheet (1) is shown in FIG.
The device was manufactured by the following device. While heating the reinforcing sheet (1) from both sides to 180 ° C. or more with infrared heaters at a speed of 5 m / min, the reinforcing sheet (1) was passed through a container filled with asphalt heated to 200 ° C., and asphalt was applied.
After passing between heating rolls heated to 60 ° C., it was then cooled while passing between cooling rolls heated to 60 ° C. while adjusting the thickness. Thus, a road reinforcing sheet was obtained. As the reinforcing sheet (1), "Preglon" manufactured by Mitsui Chemicals was used.

This sheet uses a sheet made of glass fiber and polypropylene according to the method described in Example 1 of JP-A-9-177014, and is provided with 15 g / cm 2 polyester nonwoven fabric on both sides, which is further reinforced. In order to mix at the interface between the sheet (1) and the modified asphalt layer (2), and to sufficiently impregnate the asphalt into the nonwoven fabric, a roller which had been subjected to an extra step with a roll in a container filled with asphalt was used. (The modified asphalt used in this example had a softening point of 110 ° C. and a penetration of 20.
-30, viscosity (180 ° C) 6 Pa · s, specific gravity 1.02. ) "Preglon" is 50% glass fiber, thickness 27
0 μm, tensile strength at break: 395 MPa, tensile elongation at break: 2.2%, coefficient of thermal expansion: 5 × 10 ⁻⁶ / ° C.

Experimental Example 2 Basic Physical Properties of Road Reinforcement Sheet The basic physical properties of the road reinforcing sheet obtained in the above experimental examples are shown below (Table 1), and similar sheets and their tensile breaking strengths were compared (Table 2). As similar sheets, sheets of 2 mm thickness and 3 mm thickness in which asphalt was impregnated using a nonwoven fabric as a core material were used. Tensile test is JIS K7113
The measurement was performed according to “Plastic tensile test method”. The shear adhesive strength and the vertical adhesive strength were measured in accordance with Japan Road Public Corporation's "Slab waterproofing quality standard test method". The tensile strength at break of the road reinforcing sheet was five times or more that of the conventional sheet material.

[0093]

[Table 1]

[0094]

[Table 2]

EXPERIMENTAL EXAMPLE 3 Performance Comparison Regarding Crack Suppression Effect When using the road reinforcing sheet obtained in Experimental Example 1, when there is no sheet, and when a similar sheet is used, the “bending test” in the pavement test method handbook , And a “repeated bending fatigue test” were performed to compare the crack inhibiting effect.

The test piece for the bending test was prepared in accordance with the “Bending Test” of the Handbook for Pavement Testing, and the road reinforcing sheet and similar sheets were attached under the asphalt mixture of the test piece. The layers were integrated by heat. For the test method, bending strength, strain at break, displacement until break, and fracture energy were measured in accordance with the Handbook of Pavement Test Methods.

The test piece for the repeated bending fatigue test was prepared according to the “bending test” in the Handbook for Pavement Testing. The size of the test piece was 50 mm × 50 mm × 400 mm. The test method is to maintain the constant temperature layer of the testing machine at 5 ° C. and 20 ° C., to give load control by 3 equally divided loading at a loading speed of 5 Hz, and to give a constant deformation (2 mm, 3 m
m, 5 mm). Load is 20 ℃
50% of the flexural fracture strength of the asphalt mixture at
75%.

From the test results of the bending test, the breaking energy when using the road reinforcing sheet was 1 unit less than when there was no sheet.
The value was 5 times or more and 11 times or more as compared with the case where the conventional sheet material was used. (Table 3) Based on the results of this repeated bending fatigue test, the number of times of loading up to a certain amount of deformation when using the road reinforcing sheet is 5.5 times or more as compared with the case without the sheet and compared with the case using the conventional sheet material. The value was 7.5 times or more. (Table 4)

[0099]

[Table 3]

[0100]

[Table 4]

Experimental Example 4 Construction Test on Crack Suppressing Effect and Evaluation of Crack Suppressing Effect [Construction Test] A pavement test was performed using the road reinforcing sheet manufactured in Experimental Example 1. 3 sections (width 4m x length 10)
m) was dug down by about 80 cm, and a 40 cm lower subgrade (7) was formed in the subgrade with a crusher, and a 25 cm upper subgrade (8) was further formed thereon by grain quarrying.

A 5 cm thick styrofoam plate (9) was laid over the upper subgrade (8) to make the subgrade (6) softened. Furthermore, asphalt stabilization treatment layer (1
8) was paved by 8 cm to form a test section. In each of the test sections, the base layer (5), the first section in which the surface layer (4) was laid, the second section in which the road reinforcing sheet was laid below the base layer (5), and the surface layer (4) without laying the road reinforcing sheet. It was classified as the third section under which a road reinforcing sheet was laid, and a pavement test was performed. First
For the section, a base layer (5) of 5 cm and a surface layer (4) of 5 cm were laid on the asphalt stabilization layer (10), and a pavement was prepared without laying a road reinforcing sheet. In the second section, a road reinforcing sheet was laid on the asphalt stabilization layer (10), followed by laying a base layer (5) 5 cm and a surface layer (4) 5 cm to make a paved road. In the third section, a base layer (5) of 5 cm is laid on the asphalt-stabilized treatment layer (10), and a road reinforcing sheet is laid thereon, followed by a surface layer (4) of 5 cm.
And a pavement was made.

In all of the above asphalt pavements, the production and shipment were carried out at 140 ° C., and those which were shipped were used, and were spread by a normal asphalt finisher having a single tamper and a solid screed. Rolling was performed with a large vibrating roller and a tire roller, and the rolling temperature was 110 ° C. The test is complete pavement 1
Two hours later, the road was opened and the pavement surface was observed. After the road was opened, the average daily traffic was 6,000 vehicles. The surface cracking time of the pavement surface is first
The plot was at 1.6 years, the second plot was at 2.9 years, and the third plot was at 3.6 years. .

Next, a test was conducted with the thickness of the surface asphalt in the second and third sections being 4 cm, and as in the case of 5 cm, significantly better results were obtained than in the first section.

Experimental Example 5 Construction Test on Crack Suppressing Effect and Evaluation of Crack Suppressing Effect [Construction Test] A pavement test was performed using the road reinforcing sheet manufactured in Experimental Example 1. On a road with a traffic volume of D, after cutting the existing road surface by 10 cm, a road reinforcing sheet was laid at the joint of the existing RC slab (11), and then the base layer (5) (reforming)
II type dense grain asphalt compound) 4 cm, surface layer (4) (drainable asphalt compound) 4 cm 2
Layer overlay was performed. The pavement works according to the asphalt pavement requirements and is the same as the conventional pavement method.
The road reinforcement sheet was laid while flowing asphalt melted by heating. One and a half years after the construction, the road surface condition was observed. As a result, it was confirmed that the surface asphalt had no cracks for one and a half years.

Experimental Example 6 Construction Test on Crack Suppression Effect and Evaluation of Crack Suppression Effect [Construction Test] A pavement test was performed using the road reinforcing sheet manufactured in Experiment Example 1. On a road with a traffic volume of D, after cutting the existing road surface by 4 cm, a road reinforcing sheet is laid in the through crack portion of the existing lower goose asphalt layer (12), and the surface layer (4) (dense asphalt compound) 4c
m, a one-layer overlay was performed. The pavement works according to the asphalt pavement requirements and is the same as the conventional pavement method. The road reinforcement sheet was laid while flowing asphalt melted by heating.
One and a half years after the construction, the road surface condition was observed. As a result, 1
It was confirmed that no cracks were found in the surface asphalt even in the year and a half.

Experimental Example 7 Performance Comparison Regarding Rutting Exclusion Effect When the road reinforcing sheet obtained in Experimental Example 1 was used, when there was no sheet, and when a similar sheet was used, “Wheel tracking” in the pavement test manual was used. Test "
A comparison was made of the effect of deterring rutting.

The test pieces were prepared according to the pavement test method handbook 3-3-7.
It was prepared according to the “wheel tracking test”, and the road reinforcing sheet and similar sheets were attached according to the respective sheet construction manuals. For the test method, the dynamic stability was measured according to the Handbook of Pavement Tests. According to the wheel tracking test results, the dynamic stability when using the road reinforcing sheet is 1.5 times or more compared to the case without the sheet, and 2.5 times or more compared to when using the conventional sheet material. Was. (Table 5) Also, when the surface layer was 3 cm, it had sufficient strength, and it was confirmed that thin-layer pavement was possible.

[0109]

[Table 5]

Experimental Example 8 Construction Test Regarding Rutting Exclusion Effect and Evaluation of Rutting Extrusion Suppression Effect [Construction Test] A pavement test was performed using the road reinforcing sheet manufactured in Experimental Example 1. On a road with a traffic volume of C, a part where a road reinforcing sheet is laid and a part where it is not laid are made on a 5 cm cut road surface (13), and then a surface layer (4)
A one-layer overlay (5 cm) was performed with (Modified Type II dense grain asphalt compound). One year after construction, the road surface condition was measured with a cross-sectional profiling meter.
The pavement works according to the asphalt pavement requirements and is the same as the conventional pavement method. Laying of road reinforcement sheet,
The road-reinforcing sheet was laid while flowing the heated and melted asphalt. (Table 6) Next, a test was performed with the thickness of the cut surface (13) set to 4 cm. As in the case of 5 cm, remarkably excellent results were obtained.

[0111]

[Table 6]

In Table 6, the rut amounts 1 and 2 show data when the locations of the roads are different.

Experimental Example 9 Construction Test Regarding Rutting Exclusion Effect and Evaluation of Rutting Exclusion Effect [Construction Test] A pavement test was performed using the road reinforcing sheet produced in Experimental Example 1. On roads with D traffic, jet cement (14)
After the construction, a portion where the road reinforcing sheet was laid and a portion where the road reinforcing sheet was not laid were prepared, and then a one-layer overlay (5 cm) was formed by drainage pavement (15). One year after construction, the road surface condition was measured with a cross-sectional profiling meter. The pavement works according to the asphalt pavement requirements and is the same as the conventional pavement method. The road reinforcement sheet was laid while flowing asphalt melted by heating. (Table 7) Next, a test was performed with the single-layer overlay set to 4 cm. As in the case of 5 cm, remarkably excellent results were obtained.

[0114]

[Table 7]

Experimental Example 10 Construction Test on Crack Suppressing Effect and Evaluation of Crack Suppressing Effect [Construction Test] A pavement test was performed using the road reinforcing sheet manufactured in Experimental Example 1. After cutting the existing road surface of 3 cm, a road reinforcing sheet is laid on the cracked portion of the cut road surface (13), and then the surface layer (5) (modified II type fine grain asphalt compound) (the modified II type asphalt is manufactured by Bridgestone Corporation) 1) overlay of 3 cm). The pavement work conforms to the asphalt pavement requirements and is the same as the conventional method. The road reinforcement sheet was laid while flowing asphalt melted by heating. One year after the construction, the road surface condition was observed. As a result, it was confirmed that the surface asphalt had no cracks for one and a half years.

Experimental Example 11 Construction Test on Crack Suppressing Effect and Evaluation of Crack Suppressing Effect [Construction Test] A pavement test was performed using the road reinforcing sheet manufactured in Experimental Example 1. After cutting the existing road surface of 3 cm, a road reinforcing sheet was laid on the cracked portion of the cut road surface (13), followed by a one-layer overlay of the drainable pavement road surface (15) 3cm. The pavement work conforms to the asphalt pavement requirements and is the same as the conventional method. The road reinforcement sheet was laid while flowing asphalt melted by heating. One year after the construction, the road surface condition was observed. As a result, it was confirmed that the surface asphalt had no cracks for one and a half years.

Experimental Example 12 Construction Test on Rutting Exclusion Effect and Evaluation of Rutting Exercise Effect A pavement test was performed using the road reinforcing sheet manufactured in Experimental Example 1. A base layer (coarse-grain asphalt compound) was laid 4 cm on an 8 cm cutting road surface (13), a place where a reinforcing sheet was laid and a place where no lay sheet was laid were made, and then a surface layer (modified II type fine grain asphalt compound) was laid 4 cm. . The pavement work conforms to the asphalt pavement requirements and is the same as the conventional method. The road reinforcement sheet was laid while flowing asphalt melted by heating. One year after construction, the pavement condition was measured with a cross-sectional profiling meter. Table 8 shows the measurement results.

[0118]

[Table 8]

Experimental Example 13 Performance Comparison of Crack Suppressing Effect on Drainage Road When the road reinforcing sheet obtained in Experimental Example 1 was used, a bending test was performed for the case where no reinforcing sheet was used, and the crack suppressing effect was evaluated. A comparison was made.

The test piece for the bending test was 50 mm × 50 mm ×
The measurement was performed using a drainable asphalt compound with a size of 300 mm. Attachment of the road reinforcing sheet was performed by laminating and unifying the asphalt mixture under the asphalt mixture of the test body by heat. Bending strength, displacement (deflection amount) to failure, and fracture energy were measured. Table 9 shows the results.

From the results shown in Table 9, the breaking energy when the reinforcing sheet was used was about 14 times that when no reinforcing sheet was used.

[0122]

[Table 9] Performance comparison on crack suppression effect of road reinforcement sheet

Experimental Example 14 Performance comparison of the effect of suppressing rut digging on drainage roads When the road reinforcing sheet obtained in Experimental Example 1 was used and when the reinforcing sheet was not used, a "wheel tracking test" was performed to perform dynamic stability. A degree comparison was made.

Using the same drainable asphalt compound as in Experimental Example 13, the samples were laminated and measured. Table 1 shows the results
0 is shown.

[0125]

[Table 10] Performance comparison of rut digging suppression effect on drainage roads

From the results shown in Table 10, the dynamic stability when the reinforcing sheet was used was about twice that in the case where no sheet was used.

The sheet used in this example was tested in accordance with the shear adhesive strength test of the Japan Highway Public Corporation Testing Laboratory Data No. 124, but no peeling was observed between the reinforcing sheet and the asphalt layer.

Example 14 and Comparative Example A base asphalt having a thickness of 20 mm was prepared by using various reinforcing materials.
Various reinforcing sheets were disposed on the test piece, and a test piece having a surface asphalt thickness of 40 mm was formed thereon, and a bending test was performed. Table 11 shows the results. In addition, asphalt is dense grain 1
A 3 mm modified asphalt type II was used.

[0129]

[Table 11]

[0130]

The structure of the road reinforcing sheet and the asphalt reinforced pavement road according to the present invention is remarkably resistant to the increase in traffic volume, which has become a social problem in recent years, and to the rut and cracking of asphalt pavement caused by the increase in traffic load. Shows excellent durability.

The performance described above makes it possible, in particular, to make a thin pavement with a thin asphalt layer. Cost reduction and construction period can be reduced by reducing the amount of asphalt used. 2. When repairing roads, the surface layer is thin, reducing the amount of waste,
The cutting time can be shortened, the road cutoff time can be shortened, and environmental problems such as noise can be reduced. 3. Since the vehicle can pass through the reinforcing sheet of the present invention as it is, the vehicle can pass even during the construction, so that the construction period can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a pavement road according to the present invention.

FIG. 2 is a perspective view showing another embodiment of the paved road according to the present invention.

FIG. 3 is a diagram showing a cross section of the road reinforcing sheet used in FIG.

FIG. 4 is a diagram showing a cross section of the road reinforcing sheet used in FIG.

FIG. 5 is a view schematically showing one embodiment of an apparatus for manufacturing a road reinforcing sheet of the present invention.

FIG. 6 is a view schematically showing another embodiment of the apparatus for manufacturing the road reinforcing sheet of the present invention.

FIG. 7 is a sectional view of a general pavement structure according to the present invention.

FIG. 8 is a cross-sectional view of a general pavement structure used in a construction test of the road reinforcing sheet of the present invention.

FIG. 9 is a cross-sectional view of a pavement configuration in a construction test in which a road reinforcing sheet of the present invention is laid on a roadbed, and subsequently a base layer and a surface layer are laid.

FIG. 10 is a sectional view of a pavement configuration in a construction test in which a base layer is laid on a roadbed, a road reinforcing sheet of the present invention is laid, and then a surface layer is laid.

FIG. 11 is a cross-sectional view of a pavement configuration in a construction test in which a road reinforcing sheet of the present invention is laid on an existing RC slab after cutting an existing road surface, and subsequently a base layer and a surface layer are laid.

FIG. 12 is a cross-sectional view of a pavement configuration in a construction test in which a road reinforcing sheet of the present invention is laid on an existing lower goose asphalt layer after cutting an existing road surface, and then a base layer and a surface layer are laid.

FIG. 13 is a sectional view of a pavement configuration in a construction test in which a road reinforcing sheet of the present invention is laid on a cut road surface after cutting an existing road surface, and subsequently a base layer and a surface layer are laid.

FIG. 14 is a sectional view of a pavement configuration in a construction test in which a road reinforcing sheet of the present invention is laid on a road surface after jet cement construction by a slab thickening method, and then a surface layer is laid.

FIG. 15 is a conceptual diagram of a bending test measurement method.

FIG. 16 is a conceptual diagram of a wheel tracking test measurement method.

[Explanation of symbols]

 1A Road Reinforcement Sheet 1B Road Reinforcement Sheet 1 Reinforcement Sheet 2 Asphalt Layer 3 Fibrous Woven or Nonwoven Fabric 4 Surface Layer (Asphalt Compound) 5 Base Layer (Asphalt Compound) 6 Roadbed 7 Lower Roadbed (Crusher Run) 8 Upper Layer Roadbed (Granulated Stone) 9) Styrofoam plate 10 Asphalt stabilization layer 11 RC floor slab 12 Goose asphalt layer 13 Cutting road surface 14 Jet cement 15 Drainable pavement 16 Fused layer 17 Heating heater 18 Heating roll 19 Cooling roll 20 Butt 21 Coating roll 22 Solid tire 23 Load 24 Simulated roadbed

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuaki Koda 1190 Kasama-cho, Sakae-ku, Yokohama-shi, Kanagawa Mitsui Chemicals Co., Ltd. (72) Inventor Yukio Yokote 3-5-2 Kasumigaseki, Chiyoda-ku, Tokyo Mitsui Chemicals, Inc. In-company (72) Inventor Yoshiharu Miyasaka 1190 Kasama-cho, Sakae-ku, Yokohama-shi, Kanagawa Prefecture Inside Mitsui Chemicals, Inc. (72) Inventor Yoshitaka Hoya 1-6 Takasago, Takaishi-shi, Osaka Mitsui Chemicals Co., Ltd.In-house (72) Inventor Takashi Iiyama 1190 Kasama-cho, Sakae-ku, Yokohama-shi, Kanagawa F-term (reference) 2D051 AE04 AG01 AH01 EA01 EA03 EA06

Claims (15)

[Claims] 1. Reinforcing sheet layer (1A) and paving layer (22)
The reinforcing sheet layer (1A) includes continuous glass fibers as reinforcing fibers, and heat is applied so that the volume content of the continuous glass fibers is 30% or more and 85% or less. A pavement road comprising: a reinforcing sheet (1) comprising a composite material impregnated with a plastic resin; and an asphalt layer (2) laminated on at least one surface of the reinforcing sheet (1). 2. The reinforcing sheet layer (1A) further comprises a woven fabric layer comprising natural fibers or synthetic fibers on at least a part of the surface between the reinforcing sheet (1) and the asphalt layer (2). The reinforcing sheet layer (1) having the nonwoven fabric layer (3)
The paved road according to claim 1, wherein B). 3. A reinforcing sheet layer (1A) and a pavement layer (22).
The reinforcing sheet layer (1A) includes continuous glass fibers as reinforcing fibers, and heat is applied so that the volume content of the continuous glass fibers is 30% or more and 85% or less. The pavement road according to claim 1, comprising a reinforcing sheet (1) comprising a composite material impregnated with a plastic resin, and an asphalt layer (2) laminated on both surfaces of the reinforcing sheet (1). . 4. The reinforcing sheet (1) has a tensile breaking strength of 29.
0 MPa or more, tensile elongation at break of 10% or less, coefficient of thermal expansion of 2 × 10 ⁻⁶ to 8 × 10 ⁻⁶ / ° C., thickness of 100 μm
The paved road according to any one of claims 1 to 3, wherein the diameter is from 600 to 600 µm. 5. The pavement road according to claim 1, wherein the thickness of the asphalt layer (2) is 400 μm or more and 2,000 μm or less. 6. When the reinforcing sheet (1) and the asphalt layer (2) are subjected to shear peel strength, the layers are bonded with a strength equal to or higher than the cohesive force of the asphalt layer (2). A pavement road according to any one of claims 1 to 5. 7. The pavement layer (22) has a thickness of less than 50 mm and has a breaking energy of 4 kN in a bending test.
The pavement road according to any one of claims 1 to 6, further comprising a remarkably thin pavement layer having a thickness of not less than [mm] and a function having remarkably excellent crack resistance. 8. A remarkably thin pavement layer in which the thickness of the pavement layer (22) is less than 50 mm and the dynamic stability according to a wheel tracking test is 600 [times / mm] or more. The pavement road according to any one of claims 1 to 7, further comprising a function excellent in rut digging resistance. 9. The pavement layer (22) is drainable, and
The reinforcing sheet layer (1A or 1B) is water-blocking, and the rainwater that has passed through the pavement layer (22) does not permeate into the roadbed, and the rainwater flows along the upper surface of the reinforcing sheet layer (1A or 1B) toward the road shoulder. Claim 1 characterized by having a drainage function.
The pavement according to any one of claims 8 to 13. 10. The paved road according to claim 1, wherein the thickness of the paved layer (22) is 4.5 cm or less. 11. The thickness of the paving layer (22) is 4 to 1.5 c.
The paved road according to claim 10, wherein m is m. 12. A road structure in which the reinforcing sheet layer (1A or 1B) according to claim 1 is laid, and the road reinforcing sheet is a surface layer without laying asphalt thereon. 13. Use during road construction in which the reinforcing sheet layer (1A or 1B) according to claim 1 is laid, and the reinforcing sheet layer is a surface layer without laying asphalt thereon. The structure of the temporary road. 14. When a crack, a rut or a defect occurs on a pavement surface of a road paved with asphalt or concrete, at least a part of the surface of the pavement road is cut, and if necessary, the crack or the defect is partially removed. A method for repairing a pavement road, comprising: providing the pavement road structure according to any one of claims 1 to 11 after the repair. 15. A pavement road structure having a drainage function in a shoulder direction according to claim 9, wherein after cutting a surface and partially repairing a crack or a defective portion on a road paved with asphalt or concrete, the road is drained in a shoulder direction. A method for repairing paved roads, characterized by the following.