CN112779835A - Anti-reflection crack road surface structure based on flexible transformation of rigid road surface - Google Patents

Anti-reflection crack road surface structure based on flexible transformation of rigid road surface Download PDF

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Publication number
CN112779835A
CN112779835A CN202011629698.5A CN202011629698A CN112779835A CN 112779835 A CN112779835 A CN 112779835A CN 202011629698 A CN202011629698 A CN 202011629698A CN 112779835 A CN112779835 A CN 112779835A
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layer
asphalt
pavement
modified
modified geopolymer
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CN112779835B (en
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季晓丽
李熙
钟世云
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Shanghai Liyang Road Reinforcement Technology Co ltd
Tongji University
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Shanghai Liyang Road Reinforcement Technology Co ltd
Tongji University
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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C7/00Coherent pavings made in situ
    • E01C7/08Coherent pavings made in situ made of road-metal and binders
    • E01C7/32Coherent pavings made in situ made of road-metal and binders of courses of different kind made in situ
    • E01C7/325Joining different layers, e.g. by adhesive layers; Intermediate layers, e.g. for the escape of water vapour, for spreading stresses
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/006Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing mineral polymers, e.g. geopolymers of the Davidovits type
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C11/00Details of pavings
    • E01C11/16Reinforcements
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00Technologies relating to the processing of minerals
    • Y02P40/10Production of cement, e.g. improving or optimising the production methods; Cement grinding

Abstract

The invention discloses an anti-reflection crack pavement structure based on flexible transformation of a rigid pavement, which comprises a fine particle type modified asphalt concrete layer, a coarse particle type modified asphalt concrete layer, an asphalt modified geopolymer stress absorption layer, a modified geopolymer anti-cracking layer and a concrete plate, wherein the fine particle type modified asphalt concrete layer, the coarse particle type modified asphalt concrete layer, the asphalt modified geopolymer stress absorption layer, the modified geopolymer anti-cracking layer and the concrete plate are sequentially arranged from top to bottom, and the modified geopolymer anti-cracking layer covers the joint of the concrete plate. According to the reflection crack resistant pavement structure based on flexible transformation of the rigid pavement, the asphalt modified geopolymer stress absorbing layer is compact after being formed, strong in bonding force and free of water seepage, the bonding performance between the asphalt modified geopolymer stress absorbing layer and cement concrete and an asphalt surface layer is good, the asphalt modified geopolymer stress absorbing layer can deform along with deformation of a base layer, and the reflection crack resistant pavement structure has excellent self-healing capability, so that the reflection crack of the traditional cement pavement which is changed from white to black is eliminated, asphalt pavement diseases caused by plate joints are reduced, the service life of a road is prolonged, and the driving comfort is improved.

Description

Anti-reflection crack road surface structure based on flexible transformation of rigid road surface
Technical Field
The invention relates to a pavement structure, in particular to an anti-reflection crack pavement structure based on flexible transformation of a rigid pavement.
Background
Along with economic development and urbanization progress, the highway industry gradually makes a rigid pavement flexible, namely, an original cement concrete pavement is reformed into an asphalt concrete pavement, so that the effects of environmental protection, dust prevention, noise reduction and driving comfort increase are achieved. Compared with the original concrete pavement, the adhesion between the road pavement which is changed into black from white and the tires is enhanced, the braking performance of the vehicle in the emergency treatment is greatly improved, and the vehicle is safer and more stable to run; the noise generated in the running process of the vehicle is greatly reduced, and the noise reduction device plays an important role in reducing the urban noise; the black asphalt pavement has better dust absorption performance and can effectively absorb the raised dust in the running process of the vehicle, thereby improving the air quality of shops and residential houses at two sides of a street and improving the quality of beautifying the urban environment.
At present, most of 'white to black' projects adopt a construction method of directly paving an asphalt surface layer on a concrete plate pavement, and reflection cracks are the most common problems and can bring adverse effects on pavement performance and durability. Firstly, the water resistance of a pavement structure is reduced, and the foundation is damaged by rain wash; secondly, the discontinuous pavement slab structure can increase the deformation of the pavement under the load of the traveling crane; thirdly, the stability of the road structure is reduced, and the driving comfort is influenced.
Therefore, it is necessary to provide an anti-reflective crack pavement structure based on a modified geopolymer material applied to the flexible modification of a rigid pavement, aiming at the problem of diseases such as reflective cracks frequently occurring in the flexible modification engineering of a concrete rigid pavement. The invention provides an anti-reflection crack pavement structure based on a modified geopolymer material and applied to flexible transformation of a rigid pavement, and an epoxy resin modified geopolymer material.
Disclosure of Invention
The invention aims to solve the technical problem of providing an anti-reflection crack pavement structure based on flexible transformation of a rigid pavement, which has good mechanical property and durability, can eliminate the reflection cracks of changing white into black on the traditional cement pavement, reduces asphalt pavement diseases caused by plate joints, prolongs the service life of the pavement and increases the driving comfort.
The invention provides an anti-reflection crack pavement structure based on flexible transformation of a rigid pavement, which comprises a fine particle type modified asphalt concrete layer, a coarse particle type modified asphalt concrete layer, an asphalt modified geopolymer stress absorption layer, a modified geopolymer anti-crack layer and a concrete plate, wherein the fine particle type modified asphalt concrete layer, the coarse particle type modified asphalt concrete layer, the asphalt modified geopolymer stress absorption layer, the modified geopolymer anti-crack layer and the concrete plate are sequentially arranged from top to bottom, and the modified geopolymer anti-crack layer covers the joint of the concrete plate.
Furthermore, the modified geopolymer anti-cracking layer comprises a three-layer structure which is sequentially provided with an asphalt modified geopolymer layer, graphite carbon fiber cloth and an epoxy resin modified geopolymer layer from top to bottom.
Furthermore, the monofilament diameter of the graphite carbon fiber cloth is 8-10 microns, the tensile strength of the mesh cloth formed by the graphite carbon fibers is 6000-8000 MPa, the tensile elastic modulus is 300-400 GPa, and the elongation is 1.5-2.0%.
Further, the thickness of the stress absorption layer of the asphalt modified geopolymer is 2-3 cm, and the stress absorption layer comprises the following components in parts by weight:
Figure BDA0002875939780000021
further, the metakaolin is formed by dehydrating kaolin at the temperature of 800-850 ℃, and the mesh number is 600-800 meshes; the mesh number of the steel slag powder is 400 meshes; the mesh number of the quartz powder is 200 meshes; the sodium silicate is sodium silicate with the modulus of 1.2-1.4 and the solid content of 40%; the length of the polyvinyl alcohol fiber is 9mm, the diameter of the polyvinyl alcohol fiber is 15-30 mu m, the tensile strength of the polyvinyl alcohol fiber is 1200-1500 MPa, and the elongation at break of the polyvinyl alcohol fiber is 8-12%; the emulsified asphalt is cation emulsified asphalt, the solid content is 50%, and the elongation at break is 40%.
Further, the epoxy resin modified polymer layer comprises the following components in parts by weight:
Figure BDA0002875939780000022
further, the zeolite powder is 400-600 meshes; the low-calcium fly ash is first-grade fly ash with 5-6% of calcium content; the sodium silicate is sodium silicate with the modulus of 1.2-1.4 and the solid content of 40%; the waterborne epoxy resin is prepared from emulsion and a curing agent according to the proportion of 1:0.8, the solid content of the emulsion is 50-55%, and the viscosity is 1000-2000 MPa s; the curing agent contains 50% of effective components, and has a viscosity of 2000-3000 MPa s.
Furthermore, the 7d flexural strength of the modified geopolymer anti-cracking layer is 20-25 MPa, and the 7d tensile bonding strength is 6-8 MPa.
Compared with the prior art, the invention has the following beneficial effects: the reflection crack resistant pavement structure based on flexible transformation of the rigid pavement, provided by the invention, has the advantages of compactness, strong bonding force, no water seepage after the asphalt modified geopolymer is subjected to stress absorption forming, good bonding performance with cement concrete and an asphalt surface layer, deformation along with deformation of a base layer and excellent self-healing capability. The asphalt modified geopolymer stress absorbing layer improves the cohesiveness of asphalt and cement concrete, and absorbs and improves the stability and durability of a pavement structure. The modified geopolymer anti-cracking layer has a three-layer structure, and the epoxy resin modified geopolymer material slurry on the lower layer can freely permeate into and fill gaps of concrete slabs, so that the stability of the original concrete slabs is improved. Through the construction of the modified geopolymer anti-cracking layer at the joint of the concrete plate, the occurrence of reflection cracks at the gap position of the road surface plate changed from white to black is delayed or even eliminated.
Drawings
FIG. 1 is a schematic structural diagram of an anti-reflective cracked pavement based on flexible transformation of a rigid pavement in an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a modified polymer anti-cracking layer according to an embodiment of the present invention.
In the figure:
1-1 fine particle type modified asphalt concrete layer; 1-2 coarse grain type modified asphalt concrete layer; 3 asphalt modified geopolymer stress absorbing layer; 2 modified geopolymer anti-cracking layer; 4, concrete plate; 5, original pavement base course and roadbed; 6 concrete slab clearance; 2-1 an asphalt-modified geopolymer layer; 2-2 of graphite carbon fiber cloth; 2-3 epoxy resin modified polymer layer.
Detailed Description
The invention is further described below with reference to the figures and examples.
Fig. 1 is a schematic structural diagram of an anti-reflection crack pavement based on flexible transformation of a rigid pavement in the embodiment of the invention.
Please refer to fig. 1; the reflection crack resisting pavement structure based on flexible transformation of the rigid pavement comprises a fine particle type modified asphalt concrete layer 1-1, a coarse particle type modified asphalt concrete layer 1-2, an asphalt modified geopolymer stress absorption layer 3, a modified geopolymer anti-cracking layer 2, a concrete plate 4, an original pavement base layer and roadbed 5 and a concrete plate block gap 6 which are sequentially arranged from top to bottom.
The modified geopolymer material is applied to an anti-reflection crack pavement structure transformed by rigid pavement flexibility, and the modified geopolymer anti-crack layer 2 is 10cm in width and 5mm in thickness and is divided into three layers. The 7d flexural strength is 20-25 MPa, and the 7d tensile bonding strength is 6-8 MPa.
As shown in fig. 2, the device sequentially comprises, from top to bottom: 2-1 of asphalt modified geopolymer layer with the thickness of 3mm, 2-2 of graphite carbon fiber cloth and 2-3 of epoxy resin modified geopolymer layer with the thickness of 2 mm. The 3mm asphalt modified geopolymer layer 2-1 and the asphalt modified geopolymer stress absorbing layer 3 are made of the same material, the cohesiveness and the compatibility of the two layers are good, and the tensile stress and the shear stress generated by the concrete slab block gap 6 can be effectively eliminated by being compounded with the graphite carbon fiber cloth 2-2; the 2-3 cm epoxy resin modified polymer layer has good fluidity, and can penetrate into the gaps 6 of the concrete slabs to fill and bond adjacent slabs, and can be well adhered to the surfaces of the concrete slabs, and has high mechanical property. The anti-cracking layer with the three-layer structure acts on the joint position of the original concrete plate, so that the reflection crack caused by the plate gap can be effectively eliminated and delayed, and the waterproof performance of the pavement is improved.
The asphalt modified geopolymer stress absorption layer 3 provided by the invention has the thickness of 2-3 cm, and has the performance characteristics of high ductility, high compactness, excellent mechanical property and cohesiveness, good waterproofness and good self-healing property. The formulation of the asphalt modified geopolymer material comprises:
Figure BDA0002875939780000041
the material of the epoxy resin modified geopolymer layer 2-3 provided by the invention has high mechanical property, good fluidity and permeability and good bonding property with cement concrete. The formula comprises the following components:
Figure BDA0002875939780000042
Figure BDA0002875939780000051
the use method comprises the following steps: epoxy resin modified geopolymer material slurry with the thickness of 2mm is spread and spread at the joint of the original concrete plate, and meanwhile, the slurry freely permeates into and fills gaps between the plates. Laying a layer of graphite carbon fiber cloth before the epoxy resin modified geopolymer slurry is initially solidified, and then spreading asphalt modified geopolymer slurry with the thickness of 3mm on the graphite carbon fiber cloth. And after the whole surface of the modified geopolymer anti-cracking layer is dried and cured, sequentially paving an asphalt modified geopolymer stress absorption layer with the thickness of 2cm, a coarse grain type modified asphalt concrete layer with the thickness of 6cm and fine grain type modified asphalt concrete with the thickness of 4 cm.
The anti-reflection crack pavement structure based on the modified geopolymer material applied to the flexible transformation of the rigid pavement is characterized in that the monofilament diameter of 2-2 of the graphite carbon fiber cloth is 8-10 mu m, the tensile strength of the mesh cloth formed by the graphite carbon fiber is 6000-8000 MPa, the tensile elastic modulus is 300-400 Gpa, and the elongation is 1.5-2.0%.
The asphalt modified geopolymer material is characterized in that the metakaolin is formed by dehydrating kaolin at the temperature of 800-850 ℃, and the mesh number is 600-800 meshes; the mesh number of the steel slag powder is 400 meshes; the mesh number of the quartz powder is 200 meshes; the sodium silicate has the modulus of 1.2-1.4 and the solid content of 40%.
Preferably, the length of the polyvinyl alcohol fiber is 12mm, the diameter is 15-30 μm, the tensile strength is 1200-1500 MPa, and the elongation at break is 8-12%; the emulsified asphalt is cation emulsified asphalt, the solid content of the emulsified asphalt is 50%, and the elongation at break of the emulsified asphalt is 40%.
In the epoxy resin modified geopolymer material, the zeolite powder is 400-600 meshes; the low-calcium fly ash is first-grade fly ash with 5-6% of calcium content; the sodium silicate has the modulus of 1.2-1.4 and the solid content of 40%; the waterborne epoxy resin is prepared from emulsion and a curing agent according to the proportion of 1:0.8, the solid content of the emulsion is 50-55%, and the viscosity is 1000-2000 MPa s; the curing agent contains 50% of effective components, and has a viscosity of 2000-3000 MPa s.
The modified geopolymer anti-cracking layer has the characteristic of high strength and crack resistance, the 7d rupture strength is 20-25 MPa, and the 7d tensile bonding strength is 6-8 MPa.
The reflection crack resisting pavement structure based on the modified geopolymer material applied to the flexible modification of the rigid pavement can effectively treat the plate gaps and reflection cracks caused by the plate gaps in the flexible modification engineering of the rigid pavement of cement concrete, and the concrete pavement is well combined with an asphalt surface layer. Can be applied to the reconstruction of highways and municipal roads, and improves the integrity and the aesthetic degree of the 'white to black' road surface.
While the invention has been described above with reference to preferred embodiments; however, it is not intended to limit the present invention; any person skilled in the art; without departing from the spirit and scope of the present invention; but is amenable to various modifications and enhancements; therefore, the protection scope of the present invention is defined by the claims.

Claims (8)

1. The anti-reflection crack pavement structure based on flexible transformation of the rigid pavement is characterized by comprising a fine particle type modified asphalt concrete layer, a coarse particle type modified asphalt concrete layer, an asphalt modified geopolymer stress absorption layer, a modified geopolymer crack resistant layer and a concrete plate, wherein the fine particle type modified asphalt concrete layer, the coarse particle type modified asphalt concrete layer, the asphalt modified geopolymer stress absorption layer, the modified geopolymer crack resistant layer and the concrete plate are sequentially arranged from top to bottom, and the modified geopolymer crack resistant layer covers the joint of the concrete plate.
2. The antireflection crack-resistant pavement structure based on the flexible modification of the rigid pavement as claimed in claim 1, wherein the modified geopolymer crack-resistant layer comprises a three-layer structure comprising an asphalt modified geopolymer layer, a graphite carbon fiber cloth and an epoxy resin modified geopolymer layer from top to bottom.
3. The antireflection crack pavement structure based on flexible transformation of rigid pavement according to claim 2, wherein the monofilament diameter of the graphite carbon fiber cloth is 8-10 μm, the tensile strength of the mesh cloth formed by the graphite carbon fibers is 6000-8000 MPa, the tensile elastic modulus is 300-400 GPa, and the elongation is 1.5-2.0%.
4. The anti-reflection crack pavement structure based on flexible transformation of a rigid pavement according to claim 1, wherein the thickness of the stress absorption layer of the asphalt modified geopolymer is 2-3 cm, and the structure comprises the following components in parts by weight:
Figure FDA0002875939770000011
5. the anti-reflective cracked pavement structure based on flexible transformation of a rigid pavement according to claim 4, wherein the metakaolin is formed by dehydrating kaolin at a temperature of 800-850 ℃ and has a mesh number of 600-800 meshes; the mesh number of the steel slag powder is 400 meshes; the mesh number of the quartz powder is 200 meshes; the sodium silicate is sodium silicate with the modulus of 1.2-1.4 and the solid content of 40%; the length of the polyvinyl alcohol fiber is 9mm, the diameter of the polyvinyl alcohol fiber is 15-30 mu m, the tensile strength of the polyvinyl alcohol fiber is 1200-1500 MPa, and the elongation at break of the polyvinyl alcohol fiber is 8-12%; the emulsified asphalt is cation emulsified asphalt, the solid content is 50%, and the elongation at break is 40%.
6. The anti-reflective cracked pavement structure based on flexible modification of rigid pavement according to claim 2, wherein the epoxy resin modified geopolymer layer comprises the following components in parts by weight:
Figure FDA0002875939770000021
7. the anti-reflective cracked pavement structure based on flexible transformation of a rigid pavement as claimed in claim 6, wherein the zeolite powder is 400-600 meshes; the low-calcium fly ash is first-grade fly ash with 5-6% of calcium content; the sodium silicate is sodium silicate with the modulus of 1.2-1.4 and the solid content of 40%; the waterborne epoxy resin is prepared from emulsion and a curing agent according to the proportion of 1:0.8, the solid content of the emulsion is 50-55%, and the viscosity is 1000-2000 MPa s; the curing agent contains 50% of effective components, and has a viscosity of 2000-3000 MPa s.
8. The anti-reflective cracked pavement structure based on flexible transformation of rigid pavements as claimed in claim 1, wherein the modified geopolymer anti-cracking layer has a 7d flexural strength of 20-25 MPa and a 7d tensile bond strength of 6-8 MPa.
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