CN112501977B - Composite bionic anti-cracking layer for road and construction method thereof - Google Patents
Composite bionic anti-cracking layer for road and construction method thereof Download PDFInfo
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- 239000002131 composite material Substances 0.000 title claims abstract description 96
- 238000005336 cracking Methods 0.000 title claims abstract description 33
- 239000011664 nicotinic acid Substances 0.000 title claims abstract description 19
- 238000010276 construction Methods 0.000 title claims description 11
- 239000004568 cement Substances 0.000 claims abstract description 66
- 239000004746 geotextile Substances 0.000 claims abstract description 52
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 20
- 239000010410 layer Substances 0.000 claims description 144
- 239000004744 fabric Substances 0.000 claims description 25
- 239000010426 asphalt Substances 0.000 claims description 23
- 239000002245 particle Substances 0.000 claims description 18
- 239000000835 fiber Substances 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 239000006004 Quartz sand Substances 0.000 claims description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 13
- 239000012790 adhesive layer Substances 0.000 claims description 11
- 239000003638 chemical reducing agent Substances 0.000 claims description 9
- 239000010881 fly ash Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- 229920005646 polycarboxylate Polymers 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 2
- 239000003469 silicate cement Substances 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims 2
- 241001275767 Stomatopoda Species 0.000 abstract description 15
- 230000035939 shock Effects 0.000 abstract description 7
- 238000010521 absorption reaction Methods 0.000 abstract description 3
- 238000009792 diffusion process Methods 0.000 abstract description 3
- 238000013329 compounding Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 10
- 238000012360 testing method Methods 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000000203 mixture Substances 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 239000002344 surface layer Substances 0.000 description 4
- 229920002101 Chitin Polymers 0.000 description 3
- 239000011384 asphalt concrete Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 239000011229 interlayer Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 238000003892 spreading Methods 0.000 description 3
- 230000007480 spreading Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009661 fatigue test Methods 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
- 230000036961 partial effect Effects 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 206010066054 Dysmorphism Diseases 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
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- 239000004571 lime Substances 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
- E01C11/005—Methods or materials for repairing pavings
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Structures (AREA)
Abstract
The invention provides a composite bionic anti-cracking layer for roads, which comprises a high-ductility cement-based composite material layer and a composite geotextile layer which are sequentially arranged from bottom to top, wherein a bidirectional geogrid is pre-buried in the high-ductility cement-based composite material layer, plugging rods perpendicular to the geogrid are arranged at the positions of grid nodes of the geogrid up and down, the composite geotextile layer is formed by compounding multiple layers of geotextiles, and corresponding lines in each geotextile layer from top to bottom deviate by a certain angle in the same direction in a horizontal plane. According to the invention, through mutual cooperative cooperation of the structures, the pavement anti-cracking layer similar to a mantis shrimp attached structure is finally formed, and the anti-cracking layer has good stress absorption and stress diffusion capacity, excellent shock resistance and excellent anti-cracking performance, and can effectively inhibit occurrence of reflection cracks.
Description
Technical Field
The invention relates to the field of asphalt pavement, in particular to a composite bionic anti-cracking layer for a road and a construction method thereof.
Background
The asphalt pavement has the advantages of high strength, good stability, comfortable running and the like, and is a main structural form of the high-grade pavement in China. The asphalt pavement has the characteristics of high strength and rigidity of the base layer, but insufficient deformation resistance. Under the action of temperature and humidity change, the phenomenon of base layer cracking is very easy to occur. Because of surface course, basic unit zonulae occludens, when basic unit fracture degree is great, the bottom fracture phenomenon will appear in basic unit crack and the corresponding position of surface course, and through driving load constantly rolling this moment, the crack will continue upwards to form reflection crack. The generation of such cracks is extremely fragile to the road surface structure. The existing reflection crack relieving method, such as increasing the thickness of a surface layer, arranging a crack relieving layer, pre-sawing a semi-rigid base layer and the like, has the problems of high manufacturing cost, high construction difficulty, substandard technical standards and quality of domestic materials, insignificant anti-reflection crack effect, premature failure and the like.
In the field of biological science, the structure of the mantis shrimp attached has high shock resistance, the attack speed of the mantis shrimp can reach 14-23m/s, the angular speed can reach 670-990rad/s, and the acceleration can reach 65-104km/s 2 A pistol bullet corresponding to a caliber of 0.22 inch (5.588 mm) causes a very large impact due to the rapid impact of the appendage and the friction with water. Subsequent researches find that the mantis shrimp attached foot structure has high impact resistance, and the mantis shrimp attached foot structure has a very hard and highly mineralized structure outside, and the inside of the mantis shrimp attached foot is a multi-layer spirally arranged chitin fiber bundle, so that impact energy can be diffused to various areas, and damage influence caused by impact is reduced.
Therefore, based on the unique structure of the rigid shell and the multilayer fibers of the mantis shrimp, the invention develops the road composite bionic anti-cracking layer suitable for asphalt pavement, and the anti-cracking layer has good stress absorption and stress diffusion capacity, excellent shock resistance and excellent cracking resistance, is an anti-cracking pavement structure capable of effectively inhibiting reflective cracks of pavement, and can cooperate with other structural layers to better prolong the service life of pavement.
Disclosure of Invention
In view of the above, the invention provides a composite bionic crack resistant layer for roads, which has good stress absorption and stress diffusion capability, excellent impact resistance and excellent cracking resistance, and also provides a construction method of the crack resistant layer.
The composite bionic anti-cracking layer for the road comprises a high-ductility cement-based composite material layer and a composite geotextile layer which are sequentially arranged from bottom to top, wherein a bidirectional geogrid is embedded in the high-ductility cement-based composite material layer, plugging rods perpendicular to the geogrid are arranged on the upper and lower parts of grid nodes of the geogrid, the composite geotextile layer is formed by compounding multiple layers of geotextiles, and corresponding lines in each geotextile layer from top to bottom deviate by a certain angle in the same direction in a horizontal plane.
The bidirectional geogrid is formed by crisscross transverse grid strips and longitudinal grid strips, and is provided with a plurality of unit grids, wherein grid nodes refer to the intersecting positions of the transverse grid strips and the longitudinal grid strips; the cross section of grafting pole is rectangle, triangle-shaped, T shape or other dysmorphism structures, can consider to set up the barb structure that the multiunit is used for strengthening the connection in the outside of grafting pole, and the mesh node upside of geogrid is connected to the grafting pole to the accessible welded mode, makes grafting pole and geogrid form integrated into one piece structure, also can adopt integrated into one piece's mode preparation area to insert the geogrid of pole, improves joint strength. The term "same direction" offset in the same direction in the horizontal plane means the same clockwise direction or the same counterclockwise direction; taking four geotextile composite preparation composite geotextile layers as an example, taking a first geotextile warp as a standard line, when the composite geotextile is paved, a second geotextile warp rotates 30 degrees clockwise, a third geotextile warp rotates 60 degrees clockwise, a fourth geotextile warp rotates 90 degrees clockwise, the fourth geotextile warp coincides with the first geotextile weft in the direction, and the composite geotextile layer paved in the mode forms a multi-layer spiral structure.
According to the invention, the high-ductility cement-based material with excellent compression resistance, tensile resistance and multi-microcrack performance is adopted to form the rigid shell similar to mantis shrimp attached, the stress transmission resistance of the anti-cracking layer can be effectively improved, the special geogrid embedded in the high-ductility cement-based material layer is provided with the inserting connection rods at grid nodes, the microstructure similar to mantis shrimp attached is formed, the toughness and the shock resistance of the anti-cracking layer structure are increased, the composite geotechnical cloth layer is formed into the multi-layer spiral structure by adopting a specific paving mode, the chitin fiber multi-layer spiral structure similar to mantis shrimp attached and high in shock resistance is formed, and finally the anti-cracking layer similar to mantis shrimp attached is formed by mutual cooperation of the structures.
Further, from top to bottom, the included angles formed by corresponding lines in two adjacent geotextiles in the horizontal plane are equal. Ensuring that the impact energy is spread evenly over the various areas.
Further, the included angle is 20-60 degrees.
Further, the thickness of the high-ductility cement-based composite material layer is 2-4 cm.
Further, the inserting connection rod is a solid rod or a hollow rod; the composite geotextile layer is formed by compositing at least 4 geotextiles, and the geotextiles are manufactured into the composite geotextile layer by adopting a bonding or sewing mode. The geotextile layers can be glued and then pressed and bonded; can also be sewn together by needle punching, with 50-60 needle/cm 2 The needle depth is 7-9mm.
In the invention, when the composite geotextile layer is paved and constructed on the high-ductility cement-based composite material layer, when each composite geotextile is spliced in a horizontal plane, the cloth surface is flattened by manual rolling, and a deformation allowance is properly reserved, and the splicing usually adopts a plurality of methods of lap joint, stitching and welding. The width of the seam and weld is generally 0.1m or more and the overlap width is generally 0.2m or more. Geotextiles that may be exposed for extended periods of time should be welded or seamed, all seams must be continuous (e.g., spot seams are not allowed). The geotextiles must overlap a minimum of 150mm before overlapping. The minimum stitch is at least 25mm from the selvedge (the exposed edge of the material).
The geotextile adopted by the invention is a woven filament geotextile, and the thickness of the geotextile adopted by the invention is 1.0-2.0 mm. The index requirements of the single-layer geotextile are as follows;
further, the geogrid is made of high-density polyethylene plastic, and the geogrid index requirements are as follows:
(the tensile strength is the same as the weft direction in the radial direction, and the grid shape is square)
Further, asphalt bonding layer oil bonding is adopted between the high-ductility cement-based composite material layer and the composite geotechnical cloth layer.
Further, the high-ductility cement-based composite material comprises the following raw materials:
380-410kg/m of cement 3 440-460kg/m quartz sand 3 Fly ash 850-870kg/m 3 6-10kg/m high efficiency water reducing agent 3 24-28kg/m PVA fiber 3 300-320kg/m of water 3 。
Further, the cement is P.II.42.5R Portland cement; the fly ash is class I fly ash; the high-efficiency water reducer is a polycarboxylate water reducer;
the PVA fiber has a diameter of 30-45 mu m, a length of 8-15 mm, an elastic modulus of not lower than 40GPa and an elongation of 7-10%.
According to the weight percentage, the quartz sand particles with the particle size of 0.15mm and less than or equal to 0.3mm are 10% -15%, the quartz sand particles with the particle size of 0.3mm and less than or equal to 0.6mm are 30% -35%, and the quartz sand particles with the particle size of 0.6mm and less than or equal to 1.18mm are 50% -60%.
The invention also provides a construction method of the composite bionic anti-cracking layer for the road, which comprises the following steps:
(1) Coating a layer of cement paste with the water-cement ratio of 0.4-0.5 on the surface of a cement base layer, then placing a bidirectional geogrid above the base layer, utilizing a die and a clamp to ensure that the bidirectional geogrid and a plugging rod arranged on the bidirectional geogrid are not contacted with the base layer, paving a high-ductility cement-based composite material above the cement base layer, embedding the bidirectional geogrid into the high-ductility cement-based composite material to form a high-ductility cement-based composite material layer, and self-compacting the cement-based composite material after paving without vibrating;
(2) Spraying asphalt adhesive layer oil on the upper surface of the high-ductility cement-based composite material layer, wherein the dosage is 0.6-0.8 kg/m 2 Then the composite geotechnical cloth layer is paved, and then asphalt adhesive layer oil is sprayed on the upper surface of the composite geotechnical cloth layer, wherein the dosage is 0.4-0.6 kg/m 2 And forming a composite bionic anti-cracking layer on the base layer.
The invention has the beneficial effects that:
according to the invention, the high-ductility cement-based material with excellent compression resistance, tensile resistance and multi-microcrack performance is adopted to form the rigid shell similar to mantis shrimp attached, the stress transmission resistance of the anti-cracking layer can be effectively improved, the special geogrid embedded in the high-ductility cement-based material layer is provided with the inserting connection rods at grid nodes, the microstructure similar to mantis shrimp attached is formed, the toughness and the shock resistance of the anti-cracking layer structure are increased, the composite geotechnical cloth layer is formed into the multi-layer spiral structure by adopting a specific paving mode, the chitin fiber multi-layer spiral structure similar to mantis shrimp attached and high in shock resistance is formed, and finally the anti-cracking layer similar to mantis shrimp attached is formed by mutual cooperation of the structures.
The invention provides a composite bionic anti-cracking layer for a road, which is a road surface structure suitable for the field of traditional asphalt road surfaces.
Drawings
The invention is further described below with reference to the accompanying drawings and examples:
fig. 1 is a schematic structural diagram of a composite bionic crack resistant layer for road use according to the first embodiment;
FIG. 2 is a schematic view of the structure of each layer in a composite geotextile layer formed by compositing 4 geotextiles according to the first embodiment;
FIG. 3 is a partial plan view of a geogrid according to the first embodiment;
FIG. 4 is a schematic view of a partial structure of various geogrids, (a) geogrid structures used in the first embodiment, (b), (c), and (d) other alternative geogrid structures;
in the figure:
1. 2, a high-ductility cement-based composite material layer, 3, a geogrid, 4 and a plug-in rod.
Detailed Description
Example 1
The embodiment provides a composite bionic anti-cracking layer for roads, which comprises a high-ductility cement-based composite material layer and a composite geotechnical cloth layer which are sequentially arranged from bottom to top, wherein asphalt adhesive layer oil bonding is adopted between the high-ductility cement-based composite material layer and the composite geotechnical cloth layer, a bidirectional geogrid is pre-buried in the high-ductility cement-based composite material layer, and plugging rods vertical to the geogrid are arranged at the positions of grid nodes of the geogrid from top to bottom; the inserting connection rod is a hollow slender rod, the cross section of the inserting connection rod is rectangular, the composite geotechnical cloth layer is formed by compositing 4 layers of geotechnical cloth, corresponding lines in each layer of geotechnical cloth from top to bottom are offset by a certain angle in the same direction in a horizontal plane, and an included angle formed by the corresponding lines in two adjacent layers of geotechnical cloth from top to bottom in the horizontal plane is 30 degrees.
In this embodiment, the thickness of the high-ductility cement-based composite material layer is 2cm, the composite geotextile layer is formed by bonding and connecting 4 geotextiles, the geotextile adopted is a woven filament geotextile, and the thickness of the geotextile adopted is 1.0-2.0 mm. When the first layer of geotextile warp yarns are used as alignment yarns, the second layer of geotextile warp yarns rotate 30 degrees clockwise, the third layer of geotextile warp yarns rotate 60 degrees clockwise, and the fourth layer of geotextile warp yarns rotate 90 degrees clockwise to coincide with the first layer of geotextile weft yarns.
In this embodiment, the geogrid is made of high-density polyethylene plastic, and the geogrid index requirements are: the mesh size was 25mm by 25mm, the tensile strength was 80kN/m, the elongation at break was 7%, and the tensile elastic modulus was 65GPa.
In this embodiment, the high-ductility cement-based composite material comprises: 380-410kg/m of cement 3 440-460kg/m quartz sand 3 Fly ash 850-870kg/m 3 6-10kg/m high efficiency water reducing agent 3 24-28kg/m PVA fiber 3 300-320kg/m of water 3 The method comprises the steps of carrying out a first treatment on the surface of the Wherein the cement is P.II.42.5R silicate cement; the fly ash is class I fly ash, the screen residue of 45 mu m is not more than 12%, and the water demand ratio is not more than 95%; the polycarboxylate water reducer is selected as the high-efficiency water reducer, so that the ECC slurry has good workability, and the requirement of uniformly dispersing fibers in the slurry is met; the diameter of the PVA fiber is 39 mu m, the length is 12mm, the elastic modulus of the PVA fiber is 42.8GPa, and the elongation is 7%; according to the weight percentage, the quartz sand particles with the particle size of 0.15mm < and less than or equal to 0.3mm are 10.8 percent, the quartz sand particles with the particle size of 0.3mm < and less than or equal to 0.6mm are 33.8 percent, and the quartz sand particles with the particle size of 0.6mm < and less than or equal to 1.18mm are 55.4 percent.
In the embodiment, a rut board test piece consisting of an ECC material layer, composite geotextile and a rubber asphalt paving layer is manufactured indoors, then a strip-shaped test piece with the length of 300mm multiplied by 100mm is cut to form a bending type (middle load) and shearing type (bending tension type) fatigue performance test, the middle load is applied to different composite test pieces, the number of initial cracking, 1cm and 2cm fatigue tests of the asphalt paving layer is observed, and the fatigue performance of an interlayer anti-cracking layer is evaluated by comparing and observing crack expansion conditions. The experimental results are shown in the following table:
the test results of the traditional rubber asphalt layer test piece are as follows:
as can be seen from the medium-load and bias-load fatigue tests of the composite test piece, the cracking resistance of the composite test piece of the interlayer crack-resistant layer is obviously better than that of the traditional rubber asphalt layer test piece, and the interlayer crack-resistant layer can effectively absorb bending tensile stress and shearing stress caused by traffic load and temperature change, can effectively slow down the generation and expansion of reflection cracks, and has excellent cracking resistance.
The construction method of the composite bionic anti-cracking layer for the road, provided by the implementation, comprises the following steps:
(1) Coating a layer of cement paste with the water-cement ratio of 0.4-0.5 on the surface of a cement base layer, then placing a bidirectional geogrid above the base layer, ensuring that the bidirectional geogrid and a plugging rod arranged on the bidirectional geogrid are not contacted with the base layer by using a die and a clamp, paving a high-ductility cement-based composite material above the cement base layer by using a slipform cement concrete paver, embedding the bidirectional geogrid into the high-ductility cement-based composite material to form a high-ductility cement-based composite material layer, and self-compacting the cement-based composite material after paving without vibrating;
(2) Spraying asphalt adhesive layer oil on the upper surface of the high-ductility cement-based composite material layer, wherein the dosage is 0.6-0.8 kg/m 2 Then the composite geotechnical cloth layer is laid, and then the geotechnical cloth layer is orientedThe upper surface of the composite geotechnical cloth layer is sprayed with asphalt adhesive layer oil with the dosage of 0.4-0.6 kg/m 2 The transverse range of the asphalt adhesive layer oil sprayed is 5-10 cm wider than that of the geotextile, one end of the composite geotextile layer is fixed by a fixer at first, then the composite geotextile layer is tensioned by mechanical power and manpower, the tensioning elongation is preferably 1.0-1.5%, and the other end of the composite geotextile layer is fixed by the fixer, so that the composite geotextile layer is required to be laid flatly without wrinkles. The fixer comprises a fixing nail and a fixing iron sheet, wherein the fixing nail can be a cement nail, a nail shooting nail or an expansion screw, the nail length is 8-10 cm, the diameter of the expansion screw is preferably 6mm, and the fixing iron sheet can be an iron sheet strip with the thickness of 1mm and the width of 3 cm; the composite geotechnical cloth layer is transversely overlapped by 4-5 cm, and the rear end is pressed below the front end according to the paving direction; longitudinally should overlap 4-5 cm; the transverse lap joint is fixed by a fixer, and the longitudinal lap joint can be directly bonded by adhesive layer oil; thus forming a composite bionic anti-cracking layer on the base layer. The asphalt concrete surface layer can be directly paved above the crack-resistant layer, the rubber asphalt stress absorbing layer with the length of 1cm can be paved firstly, then the asphalt concrete surface layer can be paved, and the sealing layer can be paved firstly, and then the asphalt concrete surface layer can be paved.
The construction method of the rubber asphalt stress absorbing layer comprises the following steps:
a. the fiber synchronous chip-sealing vehicle is used for spreading fibers, rubber asphalt and chips at the same time, the speed is kept at a constant speed in the running process of the vehicle and is controlled at 3-4.5 km/h, and the material spreading uniformity is ensured;
b. and after spreading, adopting a 10t rubber-tire road roller to roll for 2-3 times, wherein the rolling speed is coordinated with the running speed of the fiber synchronous chip seal coat vehicle.
When the sealing layer is paved, sequentially going from the center to the edge of the road, and drawing a paving machine walking control route by lime according to the paving width of the paving machine; before the paver is started, a certain amount of mixture must be in the paver box, the mixture has proper consistency and uniform distribution, and the paver can only advance at a constant speed of 2-4 m/min. And the paving box must be constructed manually in places which cannot be reached, and the paving box is even and smooth through manual treatment. The overlap width of two pavements should not exceed 75mm when paving, the phenomenon of residual material accumulation or lack of materials at the transverse joint and the longitudinal joint does not occur, and the flatness of the joint should not be more than 6mm when measured by a 3m ruler. After paving, the demulsified and preliminarily formed thin mixture is rolled by adopting a 6-10t pneumatic tire roller, so that the mixture has a better water sealing effect.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Claims (3)
1. The utility model provides a compound bionical crack resistant layer of way which characterized in that: including high-ductility cement-based composite material layer and the compound geotechnique cloth layer that sets gradually from the bottom up, pre-buried two-way geogrid that has in the high-ductility cement-based composite material layer, geogrid's net node department all is provided with the peg graft pole of perpendicular to geogrid from top to bottom, high-ductility cement-based composite material's raw materials include: 380-410kg/m of cement 3 440-460kg/m quartz sand 3 Fly ash 850-870kg/m 3 6-10kg/m high efficiency water reducing agent 3 24-28kg/m PVA fiber 3 300-320kg/m of water 3 The method comprises the steps of carrying out a first treatment on the surface of the The inserting rod is a solid rod or a hollow rod; the composite geotechnical cloth layer is formed by compositing 4 geotechnical cloth layers, corresponding lines in each geotechnical cloth layer from top to bottom deviate by a certain angle in the same direction in a horizontal plane, and an included angle formed by the corresponding lines in two adjacent geotechnical cloth layers from top to bottom in the horizontal plane is 30 degrees; the geotextile layers are bonded or sewed to form a composite geotextile layer; the cement is P.II.42.5R silicate cement; the fly ash is class I fly ash; the high-efficiency water reducer is a polycarboxylate water reducer;
the diameter of the PVA fiber is 30-45 mu m, the length is 8-15 mm, the elastic modulus of the PVA fiber is not lower than 40GPa, and the elongation is 7-10%;
according to the weight percentage, in the quartz sand, the quartz sand particles with the particle diameter of 0.15mm and less than or equal to 0.3mm are 10% -15%, the quartz sand particles with the particle diameter of 0.3mm and less than or equal to 0.6mm are 30% -35%, and the quartz sand particles with the particle diameter of 0.6mm and less than or equal to 1.18mm are 50% -60%;
the composite bionic anti-cracking layer for the road is manufactured by construction through the following steps: (1) Coating a layer of cement paste with the water-cement ratio of 0.4-0.5 on the surface of a cement base layer, then placing a bidirectional geogrid above the base layer, utilizing a die and a clamp to ensure that the bidirectional geogrid and a plugging rod arranged on the bidirectional geogrid are not contacted with the base layer, paving a high-ductility cement-based composite material above the cement base layer, embedding the bidirectional geogrid into the high-ductility cement-based composite material to form a high-ductility cement-based composite material layer, and self-compacting the cement-based composite material after paving without vibrating;
(2) Spraying asphalt adhesive layer oil on the upper surface of the high-ductility cement-based composite material layer, wherein the dosage is 0.6-0.8 kg/m 2 Then the composite geotechnical cloth layer is paved, and then asphalt adhesive layer oil is sprayed on the upper surface of the composite geotechnical cloth layer, wherein the dosage is 0.4-0.6 kg/m 2 And forming a composite bionic anti-cracking layer on the base layer.
2. The road use composite bionic crack resistant layer according to claim 1, wherein: the thickness of the high-ductility cement-based composite material layer is 2-4 cm.
3. The construction method of the composite bionic crack resistant layer for the road according to claim 1, wherein the construction method is characterized by comprising the following steps: the method comprises the following steps:
(1) Coating a layer of cement paste with the water-cement ratio of 0.4-0.5 on the surface of a cement base layer, then placing a bidirectional geogrid above the base layer, utilizing a die and a clamp to ensure that the bidirectional geogrid and a plugging rod arranged on the bidirectional geogrid are not contacted with the base layer, paving a high-ductility cement-based composite material above the cement base layer, embedding the bidirectional geogrid into the high-ductility cement-based composite material to form a high-ductility cement-based composite material layer, and self-compacting the cement-based composite material after paving without vibrating;
(2) Spraying asphalt adhesive layer oil on the upper surface of the high-ductility cement-based composite material layerThe amount is 0.6-0.8 kg/m 2 Then the composite geotechnical cloth layer is paved, and then asphalt adhesive layer oil is sprayed on the upper surface of the composite geotechnical cloth layer, wherein the dosage is 0.4-0.6 kg/m 2 And forming a composite bionic anti-cracking layer on the base layer.
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| CN1986968A (en) * | 2005-12-22 | 2007-06-27 | 深圳市海川实业股份有限公司 | Composite earthwork cloth for road |
| CN103334419A (en) * | 2013-07-16 | 2013-10-02 | 山东大学 | Novel geogrid with ground anchors attached |
| CN107354843A (en) * | 2017-09-01 | 2017-11-17 | 沈阳建筑大学 | A kind of porous pavement and its laying method |
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