CN113322743A - Epoxy modified cement pavement anti-skid wearing layer and construction method thereof - Google Patents
Epoxy modified cement pavement anti-skid wearing layer and construction method thereof Download PDFInfo
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- CN113322743A CN113322743A CN202110621783.5A CN202110621783A CN113322743A CN 113322743 A CN113322743 A CN 113322743A CN 202110621783 A CN202110621783 A CN 202110621783A CN 113322743 A CN113322743 A CN 113322743A
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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
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/32—Coherent pavings made in situ made of road-metal and binders of courses of different kind made in situ
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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
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/35—Toppings or surface dressings; Methods of mixing, impregnating, or spreading them
- E01C7/358—Toppings or surface dressings; Methods of mixing, impregnating, or spreading them with a combination of two or more binders according to groups E01C7/351 - E01C7/356
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Abstract
The anti-skid wearing layer of the epoxy modified cement pavement comprises: the water-based epoxy resin bonding layer is formed by spraying water-based epoxy resin and a water-based epoxy curing agent on a cement concrete pavement; the epoxy asphalt sealing layer is formed by sequentially spreading a first epoxy asphalt cement, a first aggregate and a second epoxy asphalt cement on the water-based epoxy resin bonding layer and has a sandwich structure of a first epoxy asphalt cement layer/a first aggregate layer/a second epoxy asphalt cement layer; wherein the first aggregate is limestone, diabase or basalt; the high-viscosity modified asphalt macadam seal coat is formed by synchronously spreading high-viscosity modified asphalt and second aggregates on an epoxy asphalt seal coat and rolling the epoxy asphalt seal coat by a road roller, and the high-viscosity modified asphalt macadam seal coat and the epoxy asphalt seal coat are mutually embedded and extruded to form an integrated fusion structure; wherein the grain size of the second aggregate is not larger than that of the first aggregate, and the second aggregate is basalt or diabase; the asphalt seal layer is formed by spreading a seal fabric on the high-viscosity modified asphalt macadam seal layer.
Description
Technical Field
The application belongs to the technical field of asphalt roads, and particularly relates to an epoxy modified cement pavement anti-skid wearing layer and a construction method thereof.
Background
The cement concrete pavement has the advantages of high strength, high rigidity, good durability, low manufacturing cost, easy daily maintenance and the like, and is widely applied in China, wherein the specific gravity of the cement concrete pavement of the expressway is about 7.3 percent, the specific gravity of the cement concrete pavement of the first-level highway is about 40 percent, and the specific gravity of the cement concrete pavement of the second-level highway is about 57 percent. A surface macro structure of a newly-built cement concrete pavement, which is obtained by adopting the processes of galling, grooving and the like in the construction period, is greatly damaged in early stage after the cement concrete pavement is put into use for 3-5 years, and particularly, the cement concrete pavement macro structure and the micro texture are gradually worn after the cement concrete pavement is opened, so that the road surface anti-skid performance is sharply reduced, and the anti-skid force is insufficient. Under the further damaging effect of rain, snow, etc., the road surface friction coefficient is again reduced, seriously affecting the safe driving of the vehicle and the service level of the road. In recent years, the problem of skid resistance of cement concrete pavements has become one of the hot points of social attention.
At present, the research on the improvement of the anti-skid performance of cement concrete pavements at home and abroad is less, the design and construction technical rules in the aspect are lacked, and when the anti-skid performance of the pavements is insufficient, the surface of the pavements is mainly subjected to hard grooving or rough surface in a fine milling mode, so that the aim of improving the anti-skid performance is fulfilled. The mode can obtain higher anti-skid performance at the initial stage, but can seriously affect the passing quality of vehicles and increase the driving noise, and meanwhile, the anti-skid performance of the road surface is quickly attenuated under the influence of external climate and vehicle load, thereby causing serious traffic safety hidden danger again.
In recent years, on the premise of not obviously damaging the surface of the original cement concrete pavement, the research reports of improving the anti-skid performance of the pavement by additionally paving a functional layer are gradually increased.
At present, the additional paving functional layer mainly comprises a super micro-surfacing layer, high-modulus asphalt concrete, a Nova Chip ultrathin overlay, an ultrathin epoxy anti-slip layer and the like. (1) In the process of additionally laying the super micro-surfacing, the super micro-surfacing is in common physical connection with a cement concrete pavement, and the bonding problem is always not effectively solved, so that the super micro-surfacing is easy to fall grains and peel under the action of the driving shearing force, and the large-area application of the super micro-surfacing is limited. (2) In the process of additionally paving the high-modulus asphalt concrete, the high-modulus asphalt concrete is directly additionally paved on a cement concrete pavement, so that the anti-rutting and anti-crack reflection capacities can be improved, but the application limitation on occasions with limitations on bearing and elevation is large. (3) In the process of additionally paving the NovaChip ultrathin covering surface, the NovaChip ultrathin covering surface is directly additionally paved on the cement concrete pavement, so that the skid resistance and the running quality of the pavement can be rapidly improved, but the application limitation on occasions with limitations on bearing and elevation is large. (4) In the process of additionally paving the ultrathin anti-slip layer, the anti-slip performance of the tunnel pavement can be greatly improved by additionally paving the ultrathin anti-slip layer on the cement concrete pavement, but the requirement on the cement concrete pavement foundation is high, and the reflection capability of an antigen pavement crack is extremely poor.
Disclosure of Invention
In view of the above, some embodiments disclose an epoxy modified cement pavement anti-skid wearing course and a construction method thereof. In one aspect, an epoxy modified cementitious pavement anti-skid wear layer comprises:
the water-based epoxy resin bonding layer is formed by spraying water-based epoxy resin and a water-based epoxy curing agent on a cement concrete pavement; wherein the pavement structure of the cement concrete pavement is not less than 0.5 mm;
the epoxy asphalt sealing layer is a sandwich structure of a first epoxy asphalt cement layer/a first aggregate layer/a second epoxy asphalt cement layer formed by sequentially spreading a first epoxy asphalt cement, a first aggregate and a second epoxy asphalt cement on the water-based epoxy resin bonding layer; the first aggregate is any one of limestone, diabase or basalt, the dosage of the first aggregate is 4-12 kg per square meter, the dosage of the first epoxy asphalt cement is 0.4-1.0 kg per square meter, and the dosage of the second epoxy asphalt cement is 0.3-0.8 kg per square meter;
the high-viscosity modified asphalt macadam seal layer is formed by synchronously paving high-viscosity modified asphalt with the temperature of 180-190 ℃ and second aggregate on an epoxy asphalt seal layer and rolling the epoxy asphalt seal layer by a rubber-tyred road roller, and the high-viscosity modified asphalt macadam seal layer and the epoxy asphalt seal layer are mutually embedded and extruded to form an integrated fusion structure; the particle size of the second aggregate is not more than that of the first aggregate, the second aggregate is basalt or diabase, the dosage of the second aggregate is 3-7 kg per square meter, and the dosage of the high-viscosity modified asphalt is 0.5-0.9 kg per square meter;
the asphalt seal coat is formed by spreading a seal fabric on a high-viscosity modified asphalt macadam seal coat, wherein the seal fabric is a mixture of high-viscosity modified emulsified asphalt and fine sand with the weight percentage of 0-50%, and the granularity of the fine sand is 40-120 meshes.
Further, some embodiments disclose the anti-skid wearing layer of the epoxy modified cement pavement, wherein the granularity of the first aggregate is 5-8 mm, and the granularity of the second aggregate is 1-3 mm or 3-5 mm.
Some embodiments disclose the anti-skid wearing layer of the epoxy modified cement pavement, wherein the granularity of the first aggregate is 3-5 mm, and the granularity of the second aggregate is 1-3 mm.
On the other hand, the construction method of the anti-skid wearing layer of the epoxy modified cement pavement comprises the following steps:
treating the cement concrete pavement to enable the pavement structure to be not less than 0.5 mm;
uniformly spraying the waterborne epoxy resin and the waterborne epoxy curing agent on a cement concrete pavement by using a synchronous layer sealing vehicle to form a waterborne epoxy resin bonding layer;
after the waterborne epoxy resin adhesive layer is cured and initially set, sequentially spreading a first epoxy asphalt cement, a first aggregate and a second epoxy asphalt cement on the waterborne epoxy resin adhesive layer by using a synchronous sealing vehicle to form an epoxy asphalt sealing layer with a sandwich structure of a first epoxy asphalt cement layer/a first aggregate layer/a second epoxy asphalt cement layer; the first aggregate is any one of limestone, diabase or basalt, the dosage of the first aggregate is 4-12 kg per square meter, the dosage of the first epoxy asphalt cement is 0.4-1.0 kg per square meter, and the dosage of the second epoxy asphalt cement is 0.3-0.8 kg per square meter;
synchronously spreading high-viscosity modified asphalt and second aggregate with the temperature of 180-190 ℃ on an epoxy asphalt seal by using a synchronous macadam seal vehicle, and rolling for 2-4 times at the speed of 2-3 km/h by using a rubber-tyred roller with the weight of 9-16 tons to form a high-viscosity modified asphalt macadam seal; the particle size of the second aggregate is not more than that of the first aggregate, the second aggregate is basalt or diabase, the dosage of the second aggregate is 3-7 kg per square meter, and the dosage of the high-viscosity modified asphalt is 0.5-0.9 kg per square meter;
and (3) spreading a sealing fabric on the high-viscosity modified asphalt macadam sealing layer by using an asphalt sealing vehicle to form the asphalt sealing layer, wherein the sealing fabric is a mixture of high-viscosity modified emulsified asphalt and fine sand with the weight percentage of 0-50%, and the granularity of the fine sand is 40-120 meshes.
Further, some examples disclose the method for constructing the anti-skid wearing layer of the epoxy modified cement pavement, wherein the aqueous epoxy resin is an emulsion with a solid content of not less than 40%.
Some embodiments disclose the construction method of the anti-skid wearing layer of the epoxy modified cement pavement, wherein the granularity of the first aggregate is 5-8 mm, and the granularity of the second aggregate is 1-3 mm or 3-5 mm.
Some embodiments disclose the construction method of the anti-skid wearing layer of the epoxy modified cement pavement, wherein the granularity of the first aggregate is 3-5 mm, and the granularity of the second aggregate is 1-3 mm.
Some embodiments disclose the construction method of the anti-sliding wearing layer of the epoxy modified cement pavement, wherein the first epoxy modified asphalt cement and the second epoxy modified asphalt cement are epoxy modified asphalt, and the mass ratio of epoxy to asphalt is not less than 1: 2.
Some embodiments disclose the construction method of the anti-skid wearing layer of the epoxy modified cement pavement, wherein the softening point of the high-viscosity modified asphalt is not less than 75 ℃, the ductility is not less than 30cm, the elastic recovery at 25 ℃ is not less than 85%, and the dynamic viscosity at 60 ℃ is not less than 100000 Pa-s.
Some embodiments disclose the construction method of the anti-skid wearing layer of the epoxy modified cement pavement, wherein the softening point of the high-viscosity modified emulsified asphalt is not less than 75 ℃, the ductility is not less than 30cm, and the dynamic viscosity at 60 ℃ is not less than 4000 Pa-s.
In the anti-skid wearing layer of the epoxy modified cement pavement disclosed by the embodiment of the application, the water-based epoxy resin of the water-based epoxy resin bonding layer can quickly permeate into the cement concrete pavement to reinforce the cement concrete pavement; the epoxy modified asphalt with high epoxy blending amount in the epoxy asphalt seal layer has high bonding performance, and the bonding force between the epoxy asphalt seal layer and the waterborne epoxy resin bonding layer is improved; meanwhile, the overall strength of the sandwich structure of the first epoxy asphalt cement layer/the first aggregate layer/the second epoxy asphalt cement layer of the epoxy asphalt sealing layer is improved; the contact surfaces between the high-viscosity modified asphalt macadam seal layer and the epoxy asphalt seal layer are mutually embedded and extruded to form an integrated fusion structure, so that the connection strength between the high-viscosity modified asphalt seal layer and the epoxy asphalt seal layer is effectively improved, cracks below the high-viscosity modified asphalt macadam seal layer are prevented from being reflected to the surface, meanwhile, a waterproof layer can be formed above a cement concrete layer, the road surface is prevented from being infiltrated underwater to protect a roadbed, a buffer layer is established, and the noise of the road surface can be effectively reduced; the asphalt seal can stabilize the loosely bonded aggregate in the high-viscosity modified asphalt macadam seal, improve the texture of the road surface and form a uniform black road surface.
The epoxy modified cement pavement anti-skid wearing layer is formed by paving on a cement concrete pavement, and comprises a water-based epoxy resin bonding layer, an epoxy asphalt sealing layer, a high-viscosity modified asphalt macadam sealing layer and an asphalt sealing layer from bottom to top, wherein the water-based epoxy resin bonding layer contains a large amount of epoxy resin which has stronger rigidity and is close to the modulus of the cement concrete pavement, and the structure has good transition property and good connection; the epoxy asphalt cementing material in the epoxy asphalt sealing layer has the rigidity of epoxy resin and the flexibility of asphalt, and the modulus of the epoxy asphalt cementing material is reduced relative to that of a water-based epoxy resin bonding layer; the high-viscosity modified asphalt macadam seal coat uses high-viscosity modified asphalt with the dynamic viscosity of not less than 100000 Pa.s at the temperature of 60 ℃, has higher modulus, and is smaller than an epoxy asphalt seal coat; the asphalt seal layer uses high-viscosity modified emulsified asphalt with dynamic viscosity not less than 20000 Pa.s at 60 ℃, and the modulus of the asphalt seal layer is reduced again. The rigidity of the cementing material of the antiskid wearing layer structure from bottom to top is gradually weakened, and the flexibility is gradually increased, so that a novel semi-rigid semi-flexible rigid-flexible antiskid wearing layer is formed. Under the action of external shearing force, the asphalt seal layer at the uppermost layer is stressed and has a certain buffering effect, the buffered acting force is transmitted to the high-viscosity modified asphalt macadam seal layer, the high-viscosity modified asphalt macadam seal layer has a certain buffering effect on the stress after being stressed, the buffered acting force is transmitted to the epoxy asphalt seal layer, and according to the rule, the acting force is gradually transmitted to the water-based epoxy resin bonding layer; the shearing acting force transmitted to the water-based epoxy resin bonding layer is far smaller than the shearing force borne by the asphalt sealing layer, so that the anti-skid wearing layer of the epoxy modified cement pavement is buffered and reduced layer by layer against the external shearing force, the direct action between the water-based epoxy resin bonding layer and the cement concrete pavement is greatly reduced, the bonding failure of two layers of materials is avoided, and the anti-skid wearing layer of the epoxy modified cement pavement newly paved on the cement concrete layer is prevented from falling off.
Drawings
FIG. 1 example 1 is a schematic view of the structure of an anti-skid wearing layer of an epoxy modified cement pavement
FIG. 2 example 1 partial enlarged view of anti-skid wearing layer structure of epoxy modified cement pavement
Reference numerals
1 cement concrete layer 2 waterborne epoxy resin bonding layer
3 epoxy asphalt seal 4 high-viscosity modified asphalt macadam seal
5 interlayer interface of asphalt seal 34
Detailed Description
The word "embodiment" as used herein, is not necessarily to be construed as preferred or advantageous over other embodiments, including any embodiment illustrated as "exemplary". Performance index tests in the examples of this application, unless otherwise indicated, were performed using routine experimentation in the art. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure.
Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; other test methods and techniques not specifically mentioned in the present application are those commonly employed by those of ordinary skill in the art.
The terms "substantially" and "about" are used herein to describe small fluctuations. For example, they may mean less than or equal to ± 5%, such as less than or equal to ± 2%, such as less than or equal to ± 1%, such as less than or equal to ± 0.5%, such as less than or equal to ± 0.2%, such as less than or equal to ± 0.1%, such as less than or equal to ± 0.05%. Numerical data represented or presented herein in a range format is used merely for convenience and brevity and thus should be interpreted flexibly to include not only the numerical values explicitly recited as the limits of the range, but also to include all the individual numerical values or sub-ranges encompassed within that range as if each numerical value and sub-range is explicitly recited. For example, a numerical range of "1 to 5%" should be interpreted to include not only the explicitly recited values of 1% to 5%, but also include individual values and sub-ranges within the indicated range. Thus, included in this numerical range are individual values, such as 2%, 3.5%, and 4%, and sub-ranges, such as 1% to 3%, 2% to 4%, and 3% to 5%, etc. This principle applies equally to ranges reciting only one numerical value. Moreover, such an interpretation applies regardless of the breadth of the range or the characteristics being described.
In this document, including the claims, conjunctions such as "comprising," including, "" carrying, "" having, "" containing, "" involving, "" containing, "and the like are understood to be open-ended, i.e., to mean" including but not limited to. The conjunctions "consisting of … …" and "consisting of … …" are closed conjunctions.
In the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present application may be practiced without some of these specific details. In the examples, some methods, means, instruments, apparatuses, etc. known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.
On the premise of no conflict, the technical features disclosed in the embodiments of the present application may be combined arbitrarily, and the obtained technical solution belongs to the content disclosed in the embodiments of the present application.
The anti-skid wearing layer of the epoxy modified cement pavement comprises: the water-based epoxy resin bonding layer is formed by spraying water-based epoxy resin and a water-based epoxy curing agent on a cement concrete pavement; the epoxy asphalt sealing layer is formed by sequentially spreading a first epoxy asphalt cement, a first aggregate and a second epoxy asphalt cement on the water-based epoxy resin bonding layer and has a sandwich structure of a first epoxy asphalt cement layer/a first aggregate layer/a second epoxy asphalt cement layer; the high-viscosity modified asphalt macadam seal coat is formed by synchronously spreading high-viscosity modified asphalt and second aggregates on an epoxy asphalt seal coat and rolling the epoxy asphalt seal coat by a rubber-tyred road roller, and the high-viscosity modified asphalt macadam seal coat and the epoxy asphalt seal coat are mutually embedded and extruded to form an integrated fusion structure; wherein the grain size of the second aggregate is not larger than that of the first aggregate, and the second aggregate is basalt or diabase; the asphalt seal layer is formed by spreading a seal fabric on the high-viscosity modified asphalt macadam seal layer. Fig. 1 is a schematic structural view of an anti-skid wearing layer of an epoxy modified cement pavement disclosed in example 1, wherein the lowest layer is a cement concrete layer 1, a waterborne epoxy resin bonding layer 2 is arranged on the cement concrete layer 1, an epoxy asphalt seal layer 3 is arranged on the waterborne epoxy resin bonding layer 2, a high-viscosity modified asphalt macadam seal layer 4 is arranged on the epoxy asphalt seal layer 3, and an asphalt seal layer 5 is arranged at the top; aggregate in the surface layer between the epoxy asphalt seal layer 3 and the high-viscosity modified asphalt macadam seal layer 4 is embedded into each other to form a three-dimensional staggered and mutually embedded interface layer, and the three-dimensional staggered and mutually embedded interface layer are mutually fused in the area of the interface layer to form an integrated fusion structure of the epoxy asphalt seal layer 3 and the high-viscosity modified asphalt macadam seal layer 4; for example, as shown in fig. 2, a partial enlarged view of an interface region a between the epoxy asphalt seal 31 and the high viscosity modified asphalt macadam seal 4 is shown, and the interlayer interface 34 is an interface layer which is three-dimensionally interlaced and mutually embedded.
In some embodiments, the water-based epoxy resin bonding layer is formed by spraying water-based epoxy resin and a water-based epoxy curing agent on a cement concrete pavement; wherein the pavement structure of the cement concrete pavement is not less than 5 mm. Usually, the water-based epoxy resin can quickly permeate into a cement concrete pavement, has a reinforcing effect on the cement concrete pavement and can enhance the strength of the cement pavement.
In some embodiments, the epoxy asphalt seal is a sandwich structure of a first epoxy asphalt cement layer/a first aggregate layer/a second epoxy asphalt cement layer formed by sequentially spreading a first epoxy asphalt cement, a first aggregate and a second epoxy asphalt cement on the aqueous epoxy resin bonding layer; the first aggregate is any one of limestone, diabase or basalt, the dosage of the first aggregate is 4-12 kg per square meter, the dosage of the first epoxy asphalt cement is 0.4-1.0 kg per square meter, and the dosage of the second epoxy asphalt cement is 0.3-0.8 kg per square meter; the epoxy mixing amount in the epoxy asphalt seal layer is high, and the epoxy modified asphalt has high bonding performance, so that the bonding force between the epoxy asphalt seal layer and the water-based epoxy resin bonding layer is improved; meanwhile, the sandwich structure of the first epoxy asphalt cement layer/the first aggregate layer/the second epoxy asphalt cement layer of the epoxy asphalt sealing layer improves the overall strength of the epoxy asphalt sealing layer.
In some embodiments, the high-viscosity modified asphalt macadam seal coat is formed by synchronously paving high-viscosity modified asphalt with the temperature of 180-190 ℃ and second aggregate on the epoxy asphalt seal coat and rolling the epoxy asphalt seal coat by a rubber-tyred roller, and the high-viscosity modified asphalt macadam seal coat and the epoxy asphalt seal coat are mutually embedded and extruded to form an integrated fusion structure; the particle size of the second aggregate is not more than that of the first aggregate, the second aggregate is basalt or diabase, the dosage of the second aggregate is 3-7 kg per square meter, and the dosage of the high-viscosity modified asphalt is 0.5-0.9 kg per square meter; usually the contact surface between high viscosity modified asphalt macadam seal and the epoxy asphalt seal inlays each other crowded, aggregate and cementing material fuse each other and form the integration and fuse the structure, effectively promoted the joint strength between high viscosity modified asphalt seal and the epoxy asphalt seal, prevent that the crack of high viscosity modified asphalt macadam seal below from reflecting to the surface, can form the waterproof layer in asphalt concrete layer top simultaneously, prevent that the road surface from oozing the protection road bed under water, and establish a buffer layer, can effectively reduce road surface noise.
In some embodiments, the asphalt seal is formed by spreading a seal material on a high-viscosity modified asphalt macadam seal, wherein the seal material is a mixture of high-viscosity modified emulsified asphalt and fine sand with the weight percentage of 0-50%, and the granularity of the fine sand is 40-120 meshes. Usually, the asphalt seal not only can stabilize the aggregate which is not firmly bonded in the high-viscosity modified asphalt macadam seal, but also can improve the texture of the road surface to form a uniform black road surface.
As an optional implementation mode, in the anti-skid wearing layer of the epoxy modified cement pavement, the granularity of the first aggregate of the epoxy asphalt sealing layer is 3-5 mm, the material is limestone, diabase or basalt, and the dosage is 4-7 kg/square meter; the dosage of the first epoxy asphalt cement is 0.4-0.7 kg per square meter, the dosage of the second epoxy asphalt cement is 0.3-0.6 kg per square meter, wherein the first epoxy asphalt cement and the second epoxy asphalt cement are epoxy modified asphalt, the mass ratio of epoxy to asphalt of the epoxy modified asphalt is not less than 1:2, the bonding strength is not less than 1.2MPa, and the gel time is not less than 10 min; the second aggregate of the high-viscosity modified asphalt macadam seal coat has the granularity of 1-3 mm, is made of basalt or diabase and is used in an amount of 3-5 kg per square meter; the dosage of the high-viscosity modified asphalt is 0.5-0.7 kg per square meter, the softening point is not less than 75 ℃, the ductility (5 ℃, 5cm/min) is not less than 30cm, the elastic recovery (25 ℃) is not less than 85%, and the dynamic viscosity at 60 ℃ is not less than 100000 Pa.s; the sealing fabric of the asphalt sealing layer is a mixture of high-viscosity modified emulsified asphalt and 70-120 meshes of fine sand with the weight percentage of 0-30%, and the dosage is 0.4-0.8 kg/square meter.
As an optional implementation mode, in the anti-skid wearing layer of the epoxy modified cement pavement, the granularity of the first aggregate of the epoxy asphalt sealing layer is 5-8 mm, the material is limestone, diabase or basalt, and the dosage is 7-12 kg/square meter; the dosage of the first epoxy asphalt cement is 0.6-1.0 kg per square meter, the dosage of the second epoxy asphalt cement is 0.4-0.8 kg per square meter, wherein the first epoxy asphalt cement and the second epoxy asphalt cement are epoxy modified asphalt, the mass ratio of epoxy to asphalt of the epoxy modified asphalt is not less than 1:2, the bonding strength is not less than 1.2MPa, and the gel time is not less than 10 min; the second aggregate specification of the high-viscosity modified asphalt macadam seal coat is 3-5 mm, the material is basalt or diabase, and the dosage is 5-7 kg per square meter; the dosage of the high-viscosity modified asphalt is 0.7-0.9 kg per square meter, the softening point is not less than 75 ℃, the ductility (5 ℃, 5cm/min) is not less than 30cm, the elastic recovery (25 ℃) is not less than 85%, and the dynamic viscosity at 60 ℃ is not less than 100000 Pa.s; the sealing fabric of the asphalt sealing layer is a mixture of high-viscosity modified emulsified asphalt and 40-70 meshes of fine sand with the weight percentage of 30-50%, the dosage is 0.7-1.2 kg/square meter, the softening point of the high-viscosity modified emulsified asphalt is not less than 75 ℃, the ductility (5 ℃, 5cm/min) is not less than 30cm, and the dynamic viscosity at 60 ℃ is not less than 4000 Pa.s.
In some embodiments, the anti-skid wearing layer of the epoxy modified cement pavement is formed by paving the anti-skid wearing layer on the cement concrete pavement, and comprises a water-based epoxy resin bonding layer, an epoxy asphalt sealing layer, a high-viscosity modified asphalt macadam sealing layer and an asphalt sealing layer from bottom to top, wherein the water-based epoxy resin bonding layer contains a large amount of epoxy resin, and the epoxy resin has stronger rigidity, has a modulus similar to that of the cement concrete pavement, and has good structural transition property and good cohesion; the epoxy asphalt cementing material in the epoxy asphalt sealing layer has the rigidity of epoxy resin and the flexibility of asphalt, and the modulus of the epoxy asphalt cementing material is reduced relative to that of a water-based epoxy resin bonding layer; the high-viscosity modified asphalt macadam seal coat uses high-viscosity modified asphalt with the dynamic viscosity of not less than 100000 Pa.s at the temperature of 60 ℃, has higher modulus, and is smaller than an epoxy asphalt seal coat; the asphalt seal layer uses high-viscosity modified emulsified asphalt with dynamic viscosity not less than 20000 Pa.s at 60 ℃, and the modulus of the asphalt seal layer is reduced again. The rigidity of the cementing material of the antiskid wearing layer structure from bottom to top is gradually weakened, and the flexibility is gradually increased, so that a novel semi-rigid semi-flexible rigid-flexible antiskid wearing layer is formed. Under the action of external shearing force, the asphalt seal layer at the uppermost layer is stressed and has a certain buffering effect, the buffered acting force is transmitted to the high-viscosity modified asphalt macadam seal layer, the high-viscosity modified asphalt macadam seal layer has a certain buffering effect on the stress after being stressed, the buffered acting force is transmitted to the epoxy asphalt seal layer, and according to the rule, the acting force is gradually transmitted to the water-based epoxy resin bonding layer; the shearing acting force transmitted to the water-based epoxy resin bonding layer is far smaller than the shearing force borne by the asphalt sealing layer, so that the anti-skid wearing layer of the epoxy modified cement pavement is used for buffering and reducing the external shearing force layer by layer, the direct action between the water-based epoxy resin bonding layer and the cement concrete pavement is greatly reduced, and the phenomenon that a new paving layer falls off due to bonding failure of two layers of materials is avoided.
In some embodiments, a method for constructing an anti-skid wearing layer of an epoxy modified cement pavement comprises the following steps:
treating the cement concrete pavement to enable the pavement structure to be not less than 0.5 mm; the treatment of cement concrete road surface usually, include the treatment to the slight road surface diseases such as exposed bone, crack, board angle fracture that the width is not greater than 5mm appearing on the cement concrete road surface, to the cement concrete road surface structure is complete, the intensity is sufficient, the road surface appears the great road surface diseases such as pot hole, hunch, purchasing, crack of the width is greater than 5mm, etc.; the common treatment process is to repair according to the related requirements of technical Specification for maintaining the cement concrete pavement of the highway (JTJ 073.1-2001) and to be used after reaching the standard; adopting a fine cleaning and planing machine to roughen the old cement concrete pavement when the pavement is smooth; the pavement structure is not less than 0.5 mm;
uniformly spraying the waterborne epoxy resin and the waterborne epoxy curing agent on a cement concrete pavement by using a synchronous layer sealing vehicle to form a waterborne epoxy resin bonding layer; after the treatment of the cement concrete pavement is usually finished, a synchronous sealing vehicle capable of spraying reaction type cementing materials is adopted for spraying operation, and a water-based epoxy resin bonding layer is formed after proper curing; usually, one or more of the trade marks of E20, E44 and E51 can be selected as the waterborne epoxy resin to prepare waterborne epoxy resin emulsion, wherein the solid content is not less than 40 percent, and the viscosity is not more than 100mPa & s; the waterborne epoxy curing agent can be selected from ammonia epoxy curing agents, and the solid content is not less than 40 percent;
after the waterborne epoxy resin adhesive layer is cured and initially set, sequentially spreading a first epoxy asphalt cement, a first aggregate and a second epoxy asphalt cement on the waterborne epoxy resin adhesive layer by using a synchronous sealing vehicle to form an epoxy asphalt sealing layer with a sandwich structure of a first epoxy asphalt cement layer/a first aggregate layer/a second epoxy asphalt cement layer; the first aggregate is any one of limestone, diabase or basalt, the dosage of the first aggregate is 4-12 kg per square meter, the dosage of the first epoxy asphalt cement is 0.4-1.0 kg per square meter, and the dosage of the second epoxy asphalt cement is 0.3-0.8 kg per square meter; the construction can be carried out by adopting a synchronous sealing vehicle capable of spraying reaction type cementing materials, the construction can be carried out by two steps, firstly, the synchronous sealing vehicle is adopted to synchronously spray the first epoxy asphalt cementing material and the first aggregate onto the water-based epoxy resin bonding layer, and after the surface of the first epoxy asphalt cementing material is dried, the synchronous sealing vehicle is adopted to spray the second epoxy asphalt cementing material onto the paved material; as an optional embodiment, the construction can be completed in one step, and the first epoxy asphalt cement, the first aggregate and the second epoxy asphalt cement are synchronously sprayed on the water-based epoxy resin bonding layer at one time by a synchronous sealing vehicle capable of spraying reaction type bonding materials; the epoxy asphalt seal obtained after the construction generally has a sandwich structure of a first epoxy asphalt cement layer/a first aggregate layer/a second epoxy asphalt cement layer, the first aggregate is completely wrapped in the epoxy asphalt cement, and pumice cannot occur;
synchronously spreading high-viscosity modified asphalt and second aggregate with the temperature of 180-190 ℃ on an epoxy asphalt seal by using a synchronous macadam seal vehicle, and rolling for 2-4 times at the speed of 2-3 km/h by using a rubber-tyred roller with the weight of 9-16 tons to form a high-viscosity modified asphalt macadam seal; the particle size of the second aggregate is not more than that of the first aggregate, the second aggregate is basalt or diabase, the dosage of the second aggregate is 3-7 kg per square meter, and the dosage of the high-viscosity modified asphalt is 0.5-0.9 kg per square meter; the construction and spreading of the high-viscosity modified asphalt at the temperature of 180-190 ℃ is beneficial to promoting the formation of epoxy asphalt seal and asphalt seal; the interference of natural weather is small, maintenance and molding are not needed, the construction time is saved, and the vehicle can be started when the temperature of the road surface is reduced after construction is finished;
spreading a sealing fabric on the high-viscosity modified asphalt macadam sealing layer by using an asphalt sealing vehicle to form an asphalt sealing layer, wherein the sealing fabric is a mixture of high-viscosity modified emulsified asphalt and fine sand with the weight percentage of 0-50%, and the granularity of the fine sand is 40-120 meshes;
generally, after construction, proper curing is required until the sealing fabric is demulsified and the pavement is formed, so that traffic can be opened and the sealing fabric is put into use.
As an optional implementation mode, in the construction method of the anti-skid wearing layer of the epoxy modified cement pavement, the granularity of the first aggregate of the epoxy asphalt seal layer is 3-5 mm, the material is limestone, diabase or basalt, and the dosage is 4-7 kg/square meter; the dosage of the first epoxy asphalt cement is 0.4-0.7 kg per square meter, the dosage of the second epoxy asphalt cement is 0.3-0.6 kg per square meter, the first epoxy asphalt cement and the second epoxy asphalt cement are epoxy modified asphalt, the mass ratio of epoxy to asphalt in the epoxy modified asphalt is not less than 1:2, the bonding strength is not less than 1.2MPa, and the gel time is not less than 10 min; the second aggregate of the high-viscosity modified asphalt macadam seal coat has the granularity of 1-3 mm, is made of basalt or diabase and is used in an amount of 3-5 kg per square meter; the dosage of the high-viscosity modified asphalt is 0.5-0.7 kg per square meter, the softening point is not less than 75 ℃, the ductility (5 ℃, 5cm/min) is not less than 30cm, the elastic recovery (25 ℃) is not less than 85%, and the dynamic viscosity at 60 ℃ is not less than 100000 Pa.s; the sealing fabric of the asphalt sealing layer is a mixture of high-viscosity modified emulsified asphalt and 70-120 meshes of fine sand with the weight percentage of 0-30%, and the dosage is 0.4-0.8 kg/square meter. The technical index of the high-viscosity modified emulsified asphalt meets the requirement of table 9.2.3 in technical Specification for maintaining road asphalt pavement (JTG 5142 and 2019) of the industry Specification.
As an optional implementation mode, in the construction method of the anti-skid wearing layer of the epoxy modified cement pavement, the granularity of the first aggregate of the epoxy asphalt seal layer is 5-8 mm, the material is limestone, diabase or basalt, and the dosage is 7-12 kg/square meter; the dosage of the first epoxy asphalt cement is 0.6-1.0 kg per square meter, the dosage of the second epoxy asphalt cement is 0.4-0.8 kg per square meter, wherein the first epoxy asphalt cement and the second epoxy asphalt cement are epoxy modified asphalt, the mass ratio of epoxy to asphalt of the epoxy modified asphalt is not less than 1:2, the bonding strength is not less than 1.2MPa, and the gel time is not less than 10 min; the second aggregate specification of the high-viscosity modified asphalt macadam seal coat is 3-5 mm, the material is basalt or diabase, and the dosage is 5-7 kg per square meter; the dosage of the high-viscosity modified asphalt is 0.7-0.9 kg per square meter, the softening point is not less than 75 ℃, the ductility (5 ℃, 5cm/min) is not less than 30cm, the elastic recovery at 25 ℃ is not less than 85%, and the dynamic viscosity at 60 ℃ is not less than 100000 Pa.s; the sealing fabric of the asphalt sealing layer is a mixture of high-viscosity modified emulsified asphalt and 40-70 meshes of fine sand with the weight percentage of 30-50%, the dosage is 0.7-1.2 kg/square meter, the softening point of the high-viscosity modified emulsified asphalt is not less than 75 ℃, the ductility (5 ℃, 5cm/min) is not less than 30cm, and the dynamic viscosity at 60 ℃ is not less than 4000 Pa.s. The technical index of the high-viscosity modified emulsified asphalt meets the requirement of table 9.2.3 in technical Specification for maintaining road asphalt pavement (JTG 5142 and 2019) of the industry Specification.
Some embodiments disclose the construction method of the anti-skid wearing layer of the epoxy modified cement pavement, wherein the softening point of the high-viscosity modified asphalt is not less than 75 ℃, the ductility is not less than 30cm, the elastic recovery at 25 ℃ is not less than 85%, and the dynamic viscosity at 60 ℃ is not less than 100000 Pa-s.
In the anti-skid wearing layer of the epoxy modified cement pavement disclosed by the embodiment of the application, the water-based epoxy resin of the water-based epoxy resin bonding layer can quickly permeate into the cement concrete pavement to reinforce the cement concrete pavement; the epoxy modified asphalt with high epoxy blending amount in the epoxy asphalt seal layer has high bonding performance, and the bonding force between the epoxy asphalt seal layer and the waterborne epoxy resin bonding layer is improved; meanwhile, the overall strength of the sandwich structure of the first epoxy asphalt cement layer/the first aggregate layer/the second epoxy asphalt cement layer of the epoxy asphalt sealing layer is improved; the contact surfaces between the high-viscosity modified asphalt macadam seal layer and the epoxy asphalt seal layer are mutually embedded and extruded to form an integrated fusion structure, so that the connection strength between the high-viscosity modified asphalt seal layer and the epoxy asphalt seal layer is effectively improved, cracks below the high-viscosity modified asphalt macadam seal layer are prevented from being reflected to the surface, meanwhile, a waterproof layer can be formed above a cement concrete layer, the road surface is prevented from being infiltrated underwater to protect a roadbed, a buffer layer is established, and the noise of the road surface can be effectively reduced; the asphalt seal can stabilize the loosely bonded aggregate in the high-viscosity modified asphalt macadam seal, improve the texture of the road surface and form a uniform black road surface.
The epoxy modified cement pavement anti-skid wearing layer is formed by paving on a cement concrete pavement, and comprises a water-based epoxy resin bonding layer, an epoxy asphalt sealing layer, a high-viscosity modified asphalt macadam sealing layer and an asphalt sealing layer from bottom to top, wherein the water-based epoxy resin bonding layer contains a large amount of epoxy resin which has stronger rigidity and is close to the modulus of the cement concrete pavement, and the structure has good transition property and good connection; the epoxy asphalt cementing material in the epoxy asphalt sealing layer has the rigidity of epoxy resin and the flexibility of asphalt, and the modulus of the epoxy asphalt cementing material is reduced relative to that of a water-based epoxy resin bonding layer; the high-viscosity modified asphalt macadam seal coat uses high-viscosity modified asphalt with the dynamic viscosity of not less than 100000 Pa.s at the temperature of 60 ℃, has higher modulus, and is smaller than an epoxy asphalt seal coat; the asphalt seal layer uses high-viscosity modified emulsified asphalt with dynamic viscosity not less than 20000 Pa.s at 60 ℃, and the modulus of the asphalt seal layer is reduced again. The rigidity of the cementing material of the antiskid wearing layer structure from bottom to top is gradually weakened, and the flexibility is gradually increased, so that a novel semi-rigid semi-flexible rigid-flexible antiskid wearing layer is formed. Under the action of external shearing force, the asphalt seal layer at the uppermost layer is stressed and has a certain buffering effect, the buffered acting force is transmitted to the high-viscosity modified asphalt macadam seal layer, the high-viscosity modified asphalt macadam seal layer has a certain buffering effect on the stress after being stressed, the buffered acting force is transmitted to the epoxy asphalt seal layer, and according to the rule, the acting force is gradually transmitted to the water-based epoxy resin bonding layer; the shearing acting force transmitted to the water-based epoxy resin bonding layer is far smaller than the shearing force borne by the asphalt sealing layer, so that the anti-skid wearing layer of the epoxy modified cement pavement is buffered and reduced layer by layer against the external shearing force, the direct action between the water-based epoxy resin bonding layer and the cement concrete pavement is greatly reduced, the bonding failure of two layers of materials is avoided, and the anti-skid wearing layer of the epoxy modified cement pavement newly paved on the cement concrete layer is prevented from falling off.
The technical solutions and the technical details disclosed in the embodiments of the present application are only examples to illustrate the inventive concept of the present application, and do not constitute a limitation on the technical solutions of the present application, and all the conventional changes, substitutions, combinations, and the like made to the technical details disclosed in the present application have the same inventive concept as the present application and are within the protection scope of the claims of the present application.
Claims (10)
1. The antiskid wearing layer of epoxy modified cement road surface, its characterized in that includes:
the water-based epoxy resin bonding layer is formed by spraying water-based epoxy resin and a water-based epoxy curing agent on a cement concrete pavement; wherein the pavement structure of the cement concrete pavement is not less than 0.5 mm;
the epoxy asphalt sealing layer is a sandwich structure of a first epoxy asphalt cement layer/a first aggregate layer/a second epoxy asphalt cement layer formed by sequentially spreading a first epoxy asphalt cement, a first aggregate and a second epoxy asphalt cement on the aqueous epoxy resin bonding layer; the first aggregate is any one of limestone, diabase and basalt, the dosage of the first aggregate is 4-12 kg per square meter, the dosage of the first epoxy asphalt cement is 0.4-1.0 kg per square meter, and the dosage of the second epoxy asphalt cement is 0.3-0.8 kg per square meter;
the high-viscosity modified asphalt macadam seal layer is formed by synchronously paving high-viscosity modified asphalt with the temperature of 180-190 ℃ and second aggregate on the epoxy asphalt seal layer and rolling the epoxy asphalt seal layer by a rubber-tyred road roller, and the high-viscosity modified asphalt macadam seal layer and the epoxy asphalt seal layer are mutually embedded and extruded to form an integrated fusion structure; the particle size of the second aggregate is not larger than that of the first aggregate, the second aggregate is basalt or diabase, the dosage is 3-7 kg per square meter, and the dosage of the high-viscosity modified asphalt is 0.5-0.9 kg per square meter;
and the asphalt seal coat is formed by spreading a seal fabric on the high-viscosity modified asphalt macadam seal coat, wherein the seal fabric is a mixture of high-viscosity modified emulsified asphalt and fine sand with the weight percentage of 0-50%, and the granularity of the fine sand is 40-120 meshes.
2. The epoxy modified cement pavement anti-skid wearing layer of claim 1, wherein the first aggregate has a particle size of 5-8 mm, and the second aggregate has a particle size of 1-3 mm or 3-5 mm.
3. The epoxy modified cement pavement anti-skid wearing layer as claimed in claim 1, wherein the first aggregate has a particle size of 3 to 5mm, and the second aggregate has a particle size of 1 to 3 mm.
4. The construction method of the anti-skid wearing course of the epoxy modified cement pavement is characterized by comprising the following steps:
treating the cement concrete pavement to enable the pavement structure to be not less than 0.5 mm;
uniformly spraying waterborne epoxy resin and a waterborne epoxy curing agent on the cement concrete pavement by using a synchronous sealing vehicle to form a waterborne epoxy resin bonding layer;
after the waterborne epoxy resin bonding layer is cured and initially set, sequentially spreading a first epoxy asphalt cement, a first aggregate and a second epoxy asphalt cement on the waterborne epoxy resin bonding layer by using a synchronous sealing vehicle to form an epoxy asphalt sealing layer with a sandwich structure of a first epoxy asphalt cement layer/a first aggregate layer/a second epoxy asphalt cement layer; the first aggregate is any one of limestone, diabase and basalt, the dosage of the first aggregate is 4-12 kg per square meter, the dosage of the first epoxy asphalt cement is 0.4-1.0 kg per square meter, and the dosage of the second epoxy asphalt cement is 0.3-0.8 kg per square meter;
synchronously spreading high-viscosity modified asphalt and second aggregate with the temperature of 180-190 ℃ on the epoxy asphalt seal by using a synchronous broken stone seal vehicle, and rolling for 2-4 times at the speed of 2-3 km/h by using a rubber-tyred roller with the weight of 9-16 tons to form a high-viscosity modified asphalt broken stone seal; the particle size of the second aggregate is not larger than that of the first aggregate, the second aggregate is basalt or diabase, the dosage is 3-7 kg per square meter, and the dosage of the high-viscosity modified asphalt is 0.5-0.9 kg per square meter;
and (3) spreading a sealing fabric on the high-viscosity modified asphalt macadam sealing layer by using an asphalt sealing vehicle to form an asphalt sealing layer, wherein the sealing fabric is a mixture of high-viscosity modified emulsified asphalt and fine sand with the weight percentage of 0-50%, and the granularity of the fine sand is 40-120 meshes.
5. The method for constructing an anti-skid wearing course for epoxy-modified cement pavement as claimed in claim 4, wherein said aqueous epoxy resin is an emulsion having a solid content of not less than 40%.
6. The construction method of the epoxy modified cement pavement anti-skid wearing course according to claim 4, wherein the granularity of the first aggregate is 5-8 mm, and the granularity of the second aggregate is 1-3 mm or 3-5 mm.
7. The construction method of the epoxy modified cement pavement anti-skid wearing course according to claim 4, wherein the granularity of the first aggregate is 3-5 mm, and the granularity of the second aggregate is 1-3 mm.
8. The method for constructing an anti-skid wearing course of epoxy modified cement pavement as claimed in claim 4, wherein the first epoxy modified asphalt binder and the second epoxy modified asphalt binder are epoxy modified asphalt, and the mass ratio of epoxy to asphalt is not less than 1: 2.
9. The method for constructing the anti-skid wearing course of the epoxy modified cement pavement as claimed in claim 4, wherein the high-viscosity modified asphalt has a softening point of not less than 75 ℃, a ductility of not less than 30cm, an elastic recovery of not less than 85% at 25 ℃ and a dynamic viscosity of not less than 100000 Pa-s at 60 ℃.
10. The method for constructing the anti-skid wearing course of the epoxy modified cement pavement as claimed in claim 4, wherein the high-viscosity modified emulsified asphalt has a softening point of not less than 75 ℃, a ductility of not less than 30cm and a dynamic viscosity of not less than 4000 Pa-s at 60 ℃.
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