JPH0791802B2 - Water-permeable pavement - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a bituminous water-permeable pavement, in which the road surface of the pavement is colored, and then the projections of the irregularities on the pavement surface are polished. The present invention relates to a water-permeable pavement with improved flatness and aesthetics.

[Conventional technology]

Conventionally, as a pavement having water permeability, there are, for example, an open-grain size asphalt concrete pavement and a cement-based water-permeable pavement obtained by adding cement and emulsified rubber to an aggregate mainly composed of crushed stone.

This open-grain size asphalt concrete pavement is joined by the bituminous mixture of the coating materials and the interlocking of the coated aggregates with the coating layer of the bituminous mixture formed on the surface of the aggregate having the large open-grain size.

In addition, the cement-based water-permeable pavement is provided after a certain number of curing days after laying the mixture, and allows rainwater to permeate underground through the gaps in the aggregate.

[Problems to be Solved by the Invention]

These conventional bituminous water-permeable pavements have the following problems.

(1) Aggregates are so-called lumpy granules because crushed stone is used, and even if a coating layer of a bituminous mixture is formed on this surface, the shape of the coated aggregate is the same as that of the inside aggregate. For this reason, even if this coated aggregate is laid on a roadbed and flattened by a compacting machine, the pavement surface is not flat with unevenness only because the grain tops are aligned.

Therefore, it becomes difficult for pedestrians to walk, and there is a problem that it is easy to fall, especially when high heel heels are put on the top of the grain, while when the grain size of the aggregate is small, water permeability is low. There is a problem of getting worse.

(2) Since the top of the aggregate grain is not flat, the coating layer on the top of the coated aggregate easily wears, and there is a problem in durability for maintaining aesthetics.

(3) Since it is coated with the bituminous mixture, it is easy to absorb solar heat, and thus the coating layer is softened by this heat and easily flows.

(4) When the bituminous mixture is heated beyond the softening point of asphalt, sand dust and the like adhere to the surface of the pavement, causing clogging and impairing the water permeability function.

(5) Since it is coated with the bituminous mixture, there is a problem that the ground color black of the mixture is difficult to match with the aesthetics of the surrounding environment.

(6) Cement-based water-permeable pavement cannot follow the subsidence of the roadbed, resulting in destruction even with a small amount of displacement. Furthermore, the surface is hard crushed stone, which makes walking difficult, and when it falls, it is deep in the body. There is a risk of injury.

[Means for Solving the Problems]

The present invention has been made to solve these problems, and as a first feature of the means for solving the problems,
Aggregates or crushed stones and sand that make up the pavement are crushed stones,
This aggregate is a bituminous mixture of filler, asphalt, and powdered ethylene-ethyl acrylate copolymer that has affinity with asphalt and melts and flows below the asphalt mixing temperature in an amount of 0.1 to less than 0.2% by weight relative to the total mixture. In a water-permeable pavement composed of a mixture, the surface of the water-permeable pavement has a colored layer colored with a color other than the ground color of the bituminous mixture, and the pavement road surface of the convex and concave portions formed continuously By polishing the surface, the coloring and the aggregated color of the polishing portion are expressed in a striped pattern or other pattern.

Further, as a second feature, the colored layers are configured to use different colors according to the pattern.

[Operation] The present invention thus configured operates as follows.

(1) Since the apex of the coated aggregate is ground flat, the entire pavement without the angular apex of the coated aggregate has a flat surface and is easy to walk.

(2) The colored layer other than the ground color of the bituminous mixture reflects solar heat more than the color other than the background color of the bituminous mixture, and suppresses the temperature rise of the pavement.

(3) A powdery ethylene-ethyl acrylate copolymer is added to the asphalt to raise the softening point of the asphalt, so that the asphalt is prevented from flowing and clogging, and therefore the change in the color tone of the asphalt is prevented.

(4) The colored layer forms an aesthetic feeling that matches the surrounding environment.

〔Example〕

 An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view for explaining the cross-section of the structure of the water-permeable pavement of the present invention. In FIG. 1, a water-permeable roadbed 2 is formed on the upper layer of the roadbed 1. The material of the roadbed 2 is CBR60 or more, 0.4mm PI for passing through the sieve is 4 or less, and crusher run with a water permeability coefficient of 1X10 ^-3 Cm / Sec or more is used. It is desirable that the maximum particle size is small from the viewpoint of securing.

The coated aggregate 4 is laid in layers on the water-permeable roadbed 2 to form the pavement 3, and the pavement 3 has a thickness of 5c.
It was m.

In addition, as shown in FIG. 2, the coated aggregate 4 constituting the pavement 3 has filler, straight asphalt and ethylene.
It has a coating layer 6 of a bituminous mixture consisting of an acrylate copolymer.

The coated aggregate 4 has a maximum grain size of 13 mm or less, 2.
The passing weight% of the 5 mm sieve was set in the range of 12 to 25, and it was constructed as follows.

No. 6 crushed stone 70.0 parts No. 7 crushed stone 10.0 parts Sand 16.0 parts Filler 4.0 parts and straight asphalt (penetration 80/100)
The content of the coated aggregate 4 was 4.0% by weight, and the addition amount of the ethylene-ethyl acrylate copolymer as an additive was 0.16% by weight based on the total amount of the coated aggregate 4.

First, the aggregate 5 is dried at 180 ° C in a dryer.
After heating, the mixture is added to a mixer, the filler is added to the mixer, the mixture is kneaded for 10 seconds, and then the straight asphalt having a viscosity of 230 centistoke that is separately heat-treated at 140 ° C. is added. In addition, the powder of ethylene / acrylate copolymer at room temperature is added separately and kneading is performed sufficiently.
By this kneading, the coating layer 6 of the bituminous mixture is formed on the surface of the aggregate 5.

The coated aggregate 4 formed in this way is used as the water-permeable roadbed 2
Laying is done to a thickness of 5 cm on the top. When laying and spreading is wide, a compacting machine is used, and in the case of a narrow laying, paving body 3 by manual roller rolling or tampering. Is formed.

The coated aggregate 4 of the pavement 3 formed in this way is the third
As shown in the figure, since it is a granular material, it has a form in which a void Z, which is a so-called concavo-convex portion, which occurs in a gap between adjacent coated aggregates 4 is generated.

FIG. 4 shows a cross section of the pavement body 3 of the first embodiment of the water-permeable pavement body according to the present invention. The pavement body 3 of FIG. Fig. 4 shows a cross section of the exposed surface of the material 4 when colored, and in Fig. 4, the surface of the pavement 3 is a color other than black which is the ground color of the bituminous mixture, that is, yellow or red. It shows a state in which the coloring layer 7 has been formed by applying the coloring agent of No. 3, and the applied amount is 0.
It is set to 8 Kg / m ² .

The coloring agent forming the colored layer 7 has the following composition.

Coloring resin 79.5% by weight Silica 11.4% by weight Water 9.1% by weight Acrylic ester copolymer resin aqueous emulsion is used as the coloring resin of the colorant, and its physical properties are as shown in Table 1 below.

The coloring layer 7 thus formed completes the cross-linking reaction by curing at room temperature for 24 hours, and forms a film having durability and water resistance. Table 2 shows a comparison with the resin film.

It can be seen from Table 2 that the colored layer 7 in the example of the present invention exhibits a unique rheological viscous behavior, and therefore, the resin emulsions of other resin films all have a yield value and a thysotropic movement. However, the colored layer of this example does not have a yield value, which shows that it is excellent in leveling property, and its physical properties also indicate that it is a property close to oiliness. .

The water absorption of the colored layer 7 in this example is as shown in Table 3. In the water absorption test of this water absorption, the material was dried at 40 ° C. for 16 hours and then aged at 20 ° C. for 168 hours. As shown in Table 3, the water resistance is excellent.

When the convex portions of the unevenness formed on the surface of the pavement body 3 shown in FIG. 4 are ground flat by a grinder, a form as shown in FIG. 5 is obtained. In this FIG. The top of No. 4 is ground flat, which makes walking significantly easier than the surface of the aggregate shown in FIG. 3 and contributes to the improvement of durability of the coloring material.

Table 4 shows a comparison of the abradability of the coated aggregate 4 that has been abraded and the colored layer 7 that is not abraded in the abrasion test of the colored layer 7 of the pigmented coated aggregate 4. By polishing the coated aggregate 4, it is recognized that the abrasion property is improved by about 2.5 to 3 times.

Further, since the surface of the aggregate 5 is covered with the colored layer 7, the absorption of solar heat is lower than that of the uncoated one, and therefore the temperature of the pavement 3 is less likely to rise. It also prevents clogging of the pavement 3 due to the flow of asphalt and bleeding of the colored color.

Therefore, it is possible to maintain the harmony of the color that matches the environment forever, and since the aggregate 5 in the coated aggregate 4 is exposed on the surface, the coating layer of the black bituminous mixture is formed around the stone material. 6 is surrounded and colored layers 7 are scattered around it to express the pattern, so it is possible to create a paved road that matches the environment such as a luxurious shopping street, which is not found on conventional paved roads, and is durable. Since it has water resistance and water permeability, it can contribute to groundwater protection.

6 to 8 are cross-sectional views showing a cross section of the second embodiment of the water-permeable pavement of the present invention, and the same parts as those in the first embodiment have the same reference numerals.

FIG. 6 shows a coloring agent on the upper surface of the pavement body 3 composed of the coated aggregate 4 shown in FIG. FIG. 7 shows a state in which the colored layer 7 is formed on the right side surface of the coated aggregate 4 by further spraying. Further, like FIG. 6, FIG. It shows a state in which a coloring agent is sprayed obliquely downward to form a colored layer 7 ′ on the left side surface of the coated aggregate 4.

Further, when the upper surface of the pavement 3 is ground flatly, the state shown in FIG. 8 is obtained. In this FIG.
The right side of the colored layer 7'on the left side is colored with the colored layers 7 of different colors, and therefore changes depending on the viewing angle of the surface of the pavement body 3.

FIG. 9 is a plan view showing the plane of the pavement body 3 showing the third embodiment of the water-permeable pavement body of the present invention. In FIG. 9, the pavement body 3 has its surface polished flat and , Showing a state in which a pattern is expressed by partially providing height differences on the polishing surface, and the road width 10 is divided into four vertical stripes 11,11,
11 is polished one step lower, and the striped pattern 11 is expressed by this.

Further, FIG. 10 is a sectional view showing a cross section taken along the line AA in FIG. 9, but in FIG. 10, the wide surfaces on both sides sandwiching the vertical stripes 11, 11, 11 are the high surfaces 12, 12 and the low surfaces 13. By polishing with steps of 13 and 13, a shaded pattern is expressed.For example, the vertical stripes 11, 11, 11 have a width of 5 mm and a depth of 5 m.
m, the height difference between the high surface 12 and the low surface 13 is 2 mm to 3 mm, and the coloring layer 7 can be expressed by color-coding the high surface 12 and the low surface 13 as red and yellow, and green and blue. Becomes

FIG. 11 is a plan view showing a plane of a fourth embodiment of the water-permeable pavement of the present invention, and FIG. 12 is a sectional view showing a section taken along line BB in FIG.

This fourth embodiment expresses a groove-like lattice pattern 14 on the pavement 3 shown in FIG. 10, and further, a screen type or the like is placed on the upper surface of the pavement 3 to spray a colorant to give a multicolored pattern. Colored pattern
It shows the possible states of 15,15 ...

The present invention is not limited to the embodiment described above. For example, in FIG. 1, a filter layer is installed between the roadbed 1 and the roadbed 2, and the filter layer having a thickness of 0.074 mm is used. Use sand with a flow rate of 6% or less to reduce its thickness to 5
It is also possible to provide it when the soil of the roadbed 1 is likely to enter the roadbed 2 by setting it to about cm. At that time, the aggregate particle size range of the coated aggregate 4 is 0.074-20 m
m, of which 0.074 mm for aggregates is 3-6% for aggregates 0.3 mm for aggregates 5-13% for aggregates 2.5 mm for aggregates 12-25% for aggregates 5 mm for aggregates 20-36% for aggregates Grain 13 mm aggregate is 95 to 100%, and sieve grain 20 mm aggregate is 100%, the asphalt amount to this is 3.5 to 4.5% by weight, and the colorant application amount is 0.6 to 1 kg / m ² .

The striped pattern 11 and the lattice pattern 14 may have a protruding shape, but may also have a state in which the surface of the pavement body 3 is left unpolished.

In the construction of the present invention, it is necessary to pay attention to the water permeability and to finish it as a flat paved surface in order to obtain a uniform polished surface. The points to be noted at the time of construction are shown below.

(1) Points to keep in mind when constructing roadbed Be careful not to separate the material when spreading and leveling the material of the roadbed. If the surface is rough and the finish is poor, 7
It is necessary to ensure flatness by sprinkling crushed stones and take care not to stain the surface with dirt or dust.

(2) Points to keep in mind when constructing the surface layer It is necessary to use an asphalt finisher equipped with a smooth screed plate to spread the surface, but if it is done manually, it is necessary to work before the temperature of the mixture falls. is there.

In addition, it is necessary to compact compaction so that roller marks do not remain on the roller compaction and that aggregates do not scatter during polishing, and the joint portion is compacted sufficiently.

(3) Points to keep in mind when performing polishing Polishing is performed wet, and using a silicon carbide segment as the grindstone, be careful not to scatter aggregates and obtain a uniform surface. After polishing, wash with water and clean with a vacuum sweeper. I do.

〔effect〕

The water-permeable pavement of the present invention configured in this way has the following effects.

(1) A pedestrian can walk easily because the convex portion of the uneven portion on the crest of the coated aggregate continuously formed on the surface of the pavement is polished to be flat.

(2) Since it has a colored layer colored with a color other than black which is the background color of the bituminous mixture, the absorption rate of solar heat is low,
It is possible to prevent the pavement from reaching a high temperature.

(3) A modified asphalt mixture containing asphalt and a powdery ethylene-ethyl acrylate copolymer, which has an affinity for asphalt and has an affinity for asphalt and melts and flows at a temperature lower than the asphalt mixing temperature, in an amount of 0.1 to less than 0.2% by weight based on the total mixture. Therefore, it is possible to raise the softening point of the straight asphalt, prevent clogging of the water-permeable pavement due to softening of the straight asphalt, and prevent bleeding of the asphalt on the colored layer.

(4) A beautiful sidewalk where the combination of the colored layer remaining in the recess and the aggregate color of the polished part matches the environment when the convex part of the concavo-convex part formed continuously on the pavement is ground and formed flat. It is possible to enhance the distinctiveness of the sign patterned on the pavement.

(5) The water-permeable pavement allows rainwater to penetrate underground to maintain groundwater.

[Brief description of drawings]

The drawings relate to the water-permeable pavement of the present invention, and FIG. 1 is a cross-sectional view for explaining the cross-section of the structure of the water-permeable pavement of the present invention.
2 is a sectional view of the coated aggregate, FIG. 3 is an enlarged sectional view of the surface layer portion in FIG. 1, and FIG. 4 is a diagram of the coated aggregate 4 of the pavement 3 of the first embodiment. FIG. 6 is a cross-sectional view showing a cross-section when the exposed surface is colored, and FIG. 5 is a cross-sectional view showing a state where the surface of the pavement body in FIG.
FIG. 7 and FIG. 7 are operation explanatory views of forming a colored layer on the pavement body of the second embodiment, FIG. 8 is a sectional view showing a cross section of the second embodiment, and FIG. 3 is a plan view showing the plane of the third embodiment, FIG. 10 is a cross-sectional view taken along the line AA in FIG. 9, and FIG. 11 is a plan view showing the plane of the fourth embodiment. FIG. 12 is a sectional view showing a section taken along the line BB in FIG. 1 ... Roadbed, 2 ... Permeable roadbed, 3 ... Pavement, 4 ...
Coated aggregate, 5 ... Aggregate, 6 ... Coating layer, 7,7 '... Colored layer, 8,9 ... Injection nozzle, 10 ... Road width, 11 ... Striped pattern, 12 ... High Face, 13 …… Low face, 14 …… Lattice pattern, 15 ……
Color pattern

Claims (2)

[Claims] 1. Crushed stone or crushed stone and sand are used as an aggregate, and this aggregate has an affinity with asphalt and asphalt,
A water-permeable pavement made of a bituminous mixture containing 0.1% or more and less than 0.2% by weight of the whole mixture of a powdery ethylene-ethyl acrylate copolymer that melts and flows below the asphalt mixing temperature. Having a colored layer whose surface is colored with a color other than the ground color of a bituminous mixture, and expressing it as a striped pattern or other pattern by polishing the pavement road surface of the convex portion of the unevenness formed continuously A water-permeable pavement having a coloring and an aggregate color of a polished portion. 2. The water-permeable pavement according to claim 1, wherein the colored layers have different colors according to the pattern.