CN112521056B

CN112521056B - Anti-seepage asphalt concrete ultrathin wear-resistant surface layer and construction method thereof

Info

Publication number: CN112521056B
Application number: CN202011549309.8A
Authority: CN
Inventors: 邵震鹏; 徐青松; 孙玉; 吴金伟
Original assignee: Nantong Traffic Construction Engineering Co ltd
Current assignee: Nantong Traffic Construction Engineering Co ltd
Priority date: 2020-12-24
Filing date: 2020-12-24
Publication date: 2022-07-05
Anticipated expiration: 2040-12-24
Also published as: CN112521056A

Abstract

The application relates to the field of building construction, and particularly discloses an anti-water-permeability asphalt concrete ultrathin wear-resistant surface layer and a construction method thereof, wherein the anti-water-permeability asphalt concrete ultrathin wear-resistant surface layer comprises the following substances in parts by weight: 55-60 parts of matrix asphalt, 10-15 parts of fine aggregate, 8-13 parts of wear-resistant powder and 1-3 parts of modified fiber; the modified fiber comprises porous fiber and basalt fiber which are mixed according to the mass ratio of 1: 1. This application twines the body through porous fibre and basalt fibre's thoughtlessly in the ultra-thin wear-resisting surface course of asphalt concrete for modified material, through the modified fiber formation skeleton texture that twines, the impervious water endurance quality of later stage concrete surface course has been improved to the structure of the ultra-thin wear-resisting surface course of effectively stable and closely knit concrete.

Description

Anti-seepage asphalt concrete ultrathin wear-resistant surface layer and construction method thereof

Technical Field

The application relates to the field of building construction, in particular to an anti-water-seepage asphalt concrete ultrathin wear-resistant surface layer and a construction method thereof.

Background

Water damage of asphalt pavements is a serious early disease on the current roads. The water damage is one of the key factors and main damage modes influencing the surface characteristics of the skid-resistant wearing layer, and the defects of loosening and stripping of the pavement surface, pit formation and the like in a short time are caused by the falling of the asphalt film, so that the surface characteristics are greatly influenced.

The existing asphalt concrete pavement usually adopts an ultrathin wear-resistant surface layer to improve the surface function and the service performance of the pavement, and the ultrathin wear-resistant surface layer is an effective measure for prolonging the service life of the pavement, improving the running quality, correcting surface defects, improving safety characteristics including skid resistance, drainage, reducing noise and other pavement functions.

Aiming at the related technologies, the inventor thinks that the existing ultrathin wear-resistant surface layer is prepared by simple component mixing, so that the defects of insufficient compactness, easy water infiltration, reduced interlayer bonding effect and quick attenuation of later-stage water impermeability caused by easy loosening are easily caused.

Disclosure of Invention

In order to overcome the defect that the interlayer bonding effect of the asphalt concrete ultrathin wear-resistant surface layer is poor and the later-stage water permeability resistance performance is rapidly attenuated, the application provides a water permeability resistance asphalt concrete ultrathin wear-resistant surface layer and a preparation method thereof, and the following technical scheme is adopted:

the utility model provides a first aspect, this application provides an ultra-thin wear-resisting surface course of impervious type asphalt concrete adopts following technical scheme:

the ultrathin water-seepage-resistant asphalt concrete wear-resistant surface layer comprises the following components in parts by weight: 55-60 parts of matrix asphalt, 10-15 parts of fine aggregate, 8-13 parts of wear-resistant powder and 1-3 parts of modified fiber; the modified fiber comprises porous fiber and basalt fiber which are mixed according to the mass ratio of 1: 1.

Through adopting above-mentioned technical scheme, because this application twines the body for modified material through porous fiber and basalt fiber's thoughtlessly in the ultra-thin wear-resisting surface course of asphalt concrete, because the modified fiber who twines the formation effectively combines the effective interlude of the compound body that forms with base member pitch and each component, form good integration configuration, modified fiber through tangling forms skeleton texture, effectively stable and closely knit ultra-thin wear-resisting surface course of concrete's structure, thereby it is not enough to improve the ultra-thin wear-resisting surface course compactness of concrete, it coheres effect defect between the layer to reduce, and then effectively improved the impervious water endurance quality of later stage concrete surface course.

Further, the porous fiber is prepared by adopting the following scheme: (1) respectively weighing 60-65 parts of SiO by weight₂25 to 30 parts of B₂O₃8-10 parts of NaO₂1-2 parts of Al₂O₃And 0.5 to 1.0 part of Sb₂O₃Stirring and mixing the mixture and placing the mixture in a corundum crucible; (2) putting the corundum crucible in a muffle furnace, heating and melting, drawing to prepare the glass fiber, adding the glass fiber into hydrochloric acid, stirring, mixing, standing, filtering, collecting a filter cake, washing and drying to obtain the porous glass fiber.

By adopting the technical scheme, the proportion for preparing the porous fiber is optimized, and the content of the silicon dioxide is properly reduced, so that the Na content is improved₂O-B₂O₃Content of, introducing an appropriate amount of Al₂O₃Due to Al³⁺Can preferentially abstract free oxygen to form AlO in glass₄Entering a silica framework to promote phase separation of glass, and soaking the glass fiber in hydrochloric acid to ensure that Na in the glass fiber is₂O-B₂O₃Effective acid hydrolysis and formationPore structure, thus preparing the porous glass fiber with excellent dispersion system.

Further, the diameter of the porous fiber is 1-2 mm.

By adopting the technical scheme, the diameter of the porous fiber is optimized, so that the porous fiber and the basalt fiber form a good entanglement structure, and the optimized modified fiber effectively improves the mechanical property of the modified fiber as a framework structure, and further improves the water seepage resistance and durability of a later-stage concrete surface layer while effectively reducing the preparation cost of the optimized fiber.

Further, the matrix asphalt is SBS modified matrix asphalt, and the matrix asphalt is prepared by adopting the following method: (1) putting the matrix asphalt into an oven, and performing heat preservation and heating treatment to obtain preheated asphalt; (2) and adding SBS rubber particles into the preheated asphalt, shearing in a high-speed shearing instrument, collecting the mixed shearing material, placing the mixed shearing material at 175-190 ℃ for swelling for 25-30 min, and collecting the matrix asphalt.

By adopting the technical scheme, as the SBS is selected as the modified material to be filled into the matrix asphalt, the SBS rubber molecules dispersed in the matrix asphalt generate swelling and partial dissolution reaction under the action of oil content of the asphalt, and then are dispersed in the asphalt matrix in a fine particle or filiform structure, and the rubber and the asphalt form respective network structures and penetrate through each other, so that the SBS rubber material forms a good skeleton structure, the mechanical strength of the matrix asphalt is effectively improved, and the water seepage resistance of a later-stage concrete surface layer is further improved.

Further, the shearing rate of the shearing treatment in the step (2) is 5000-6000 rpm/min. Through adopting above-mentioned technical scheme, this application has optimized the shear rate of shearing processing, makes under the shearing processing of this speed, and SBS and matrix pitch can form good disperse system, through the shearing action, effectively disperses SBS inside the matrix pitch to the mechanical strength of matrix pitch has further been improved, has improved the anti infiltration performance of later stage concrete surface course.

Further, the wear-resistant powder is silicon carbide particles subjected to dispersion modification treatment, and the dispersion modification treatment comprises the following steps: (1) washing silicon carbide particles with a sodium hydroxide solution and hydrochloric acid respectively in sequence, then washing with deionized water, drying and collecting pretreated silicon carbide particles; (2) adding the pretreated silicon carbide particles into a polyvinylpyrrolidone solution according to the mass ratio of 5-8: 10-12, standing for adsorption, filtering, washing and drying to prepare the modified wear-resistant powder.

By adopting the technical scheme, as the polyvinylpyrrolidone and the silicon carbide form a good combination effect, and as the nitrogen atom in the pyrrole ring in the polyvinylpyrrolidone molecule can obtain positive electricity of one proton with one unit, the positive electricity is converted into PVP-H⁺The nitrogen atoms in the polyvinylpyrrolidone molecules can also form hydrogen bonds with silanol groups on the surfaces of the silicon carbide particles, so that the polyvinylpyrrolidone molecules can be stably adsorbed on the surfaces of the SiC particles, the dispersion performance of the SiC particles is effectively improved, the modified nanopowder is effectively dispersed in a surface layer material, and the anti-seepage performance of a later-stage concrete surface layer is further improved by embedding the modified nanopowder in an entanglement structure of modified fibers.

In a second aspect, the application provides a preparation method of an anti-water-seepage asphalt concrete ultrathin wear-resistant surface layer, which is characterized in that the preparation method comprises the following steps: s1, weighing the matrix asphalt, the fine aggregate, the coarse aggregate, the wear-resistant powder and the modified fiber according to the formula, stirring and mixing, and collecting to obtain mixed components; s2, preheating the mixed components at 145-155 ℃, collecting the preheated mixture, and spreading the preheated mixture on the road surface while the preheated mixture is hot; and S3, after the paving of the preheated mixture is finished, rolling by using a road roller to prepare the asphalt concrete ultrathin wear-resistant surface layer.

Through adopting above-mentioned technical scheme, because this application passes through polyvinylpyrrolidone cladding at silicon carbide particle surface, thereby form good dispersed structure, make it effectively improve the wear resistance and the mechanical strength of surface course, the modified fiber that entangles simultaneously passes through the skeleton texture that forms, each component of asphalt concrete is effectively supported and connected, thereby realize good mechanical strength, and finally, the good mechanical properties that matrix asphalt modified through SBS has, the intensity of the asphalt concrete surface course of preparation has effectively been improved, thereby the anti-water permeability of later stage concrete surface course has further been improved.

Further, the rolling treatment in the step S3 includes rolling treatment with a road roller of 8-12T before the preheated mixture is cooled to 90 ℃.

Through adopting above-mentioned technical scheme, the temperature of rolling treatment has been optimized in this application, prevents that the temperature from crossing the back excessively, and the asphalt concrete can not effectively form required compact structure to improve the structural performance of the concrete surface course of preparation, improved the impervious water strength of later stage concrete surface course.

In summary, the present application includes at least one of the following beneficial technical effects:

first, this application twines the body for modified material through porous fiber and basalt fiber's thoughtlessly in the ultra-thin wear-resisting surface course of asphalt concrete, because the modified fiber that twines the formation effectively alternates the combination with the mixture that matrix pitch and each component formed, form good integration configuration, modified fiber through tangling forms skeleton texture, the structure of the ultra-thin wear-resisting surface course of effective stable and closely knit concrete, thereby it is not enough to improve the ultra-thin wear-resisting surface course compactness of concrete, reduce the effect defect of cohering between the layer, and then effectively improved the impervious water endurance quality of later stage concrete surface course.

Secondly, the application forms a good combination effect through polyvinylpyrrolidone and silicon carbide, and as the nitrogen atom in the pyrrole ring in the polyvinylpyrrolidone molecule can obtain positive electricity of one proton with one unit and is converted into PVP-H +, the nitrogen atom in the polyvinylpyrrolidone molecule can also form a hydrogen bond with the silanol group on the surface of the silicon carbide particle, so that the polyvinylpyrrolidone molecule can be stably adsorbed on the surface of the SiC particle, thereby effectively improving the dispersion performance of the SiC particle, effectively dispersing the modified nano powder in the surface layer material, and further improving the water seepage resistance of the later concrete surface layer by embedding in the entanglement structure of the modified fiber.

And thirdly, the SBS is selected as a modified material to be filled into the matrix asphalt, and as SBS rubber molecules dispersed in the matrix asphalt generate swelling and partial dissolution reaction under the action of oil content of the asphalt and are then dispersed in an asphalt matrix in a fine particle or filiform structure, rubber and the asphalt form respective network structures and penetrate through each other, so that the SBS rubber material forms a good framework structure, the mechanical strength of the matrix asphalt is effectively improved, and the water seepage resistance of a later-stage concrete surface layer is further improved.

Detailed Description

The present application will be described in further detail with reference to examples.

In the examples of the present application, the raw materials used are as follows, but not limited thereto:

raw materials:

SBS resin: SBS resin with the trade name KY1303H, produced by Jinhua market Baojia plastic science and technology Limited.

Fine aggregate: fineness modulus of 2.6 and apparent density of 2.65g/cm³The natural river sand.

Coarse aggregate: diameter of 20mm, crush index of 15%, water absorption of 5%, apparent density of 2590kg/m³The crushed stone of (1).

Matrix asphalt: matrix asphalt with the model number of 10 produced by the chemical industry Limited of Jinluno of Jinan.

Examples

Preparation example 1

Preparing an asphalt base material: placing 5kg of matrix asphalt in an oven, carrying out heat preservation and heating treatment at 165 ℃ for 25min to obtain preheated asphalt, adding 1kg of SBS rubber particles into the preheated asphalt, carrying out shearing treatment at a shearing rate of 5000rpm/min in a high-speed shearing instrument for 20min, collecting mixed shearing materials, placing the mixed shearing materials at 175 ℃ for swelling for 25min, and collecting a modified asphalt base material 1;

preparing modified wear-resistant powder: taking silicon carbide particles, washing the silicon carbide particles for 3 times by respectively sequentially using 0.1mol/L sodium hydroxide solution and 0.5mol/L hydrochloric acid, then washing the silicon carbide particles by using deionized water until the washing liquid is neutral, drying the silicon carbide particles at 75 ℃ to constant weight, collecting pretreated silicon carbide particles, adding 500g of the pretreated silicon carbide particles into 1000g of polyvinylpyrrolidone solution with the mass fraction of 10%, standing and adsorbing the silicon carbide particles for 6 hours, filtering, washing and drying the silicon carbide particles to prepare modified wear-resistant powder 1;

preparing modified fibers: 600g of SiO were weighed separately₂、250g B₂O₃、80g NaO₂、10 Al₂O₃And 5g Sb₂O₃Stirring and mixing the mixture, heating and melting the mixture in a corundum crucible, drawing the mixture to prepare glass fiber with the diameter of 1mm, adding 500g of the glass fiber into 1500g of hydrochloric acid with the mass fraction of 10%, stirring and mixing the mixture, standing the mixture, filtering the mixture, collecting filter cakes, washing the filter cakes with deionized water until the washing liquid is neutral, drying the filter cakes to obtain porous glass fiber, and mixing the porous glass fiber and the basalt fiber which are mixed according to the mass ratio of 1:1 to prepare modified fiber 1;

preparation example 2

Preparing an asphalt base material: putting 6.5kg of matrix asphalt into an oven, carrying out heat preservation and heating treatment at 170 ℃ for 27min to obtain preheated asphalt, adding 1.5kg of SBS rubber particles into the preheated asphalt, carrying out shearing treatment at a shearing rate of 5500rpm/min for 25min in a high-speed shearing instrument, collecting mixed shearing materials, placing the mixed shearing materials into a temperature range of 187 ℃ for swelling for 27min, and collecting a modified asphalt base material 2;

preparing modified wear-resistant powder: washing silicon carbide particles with 0.1mol/L sodium hydroxide solution and 0.5mol/L hydrochloric acid for 4 times respectively, then washing with deionized water until the washing liquid is neutral, drying at 77 ℃ to constant weight, collecting pretreated silicon carbide particles, adding 620g of pretreated silicon carbide particles into 1100g of polyvinylpyrrolidone solution with the mass fraction of 10%, standing for adsorption for 7 hours, filtering, washing and drying to prepare modified wear-resistant powder 2;

preparing modified fibers: 625g SiO₂、275g B₂O₃、90g NaO₂、15g Al₂O₃And 7g Sb₂O₃Stirring and mixing the mixture, placing the mixture in a corundum crucible for heating and melting, drawing the mixture to prepare glass fiber with the diameter of 1mm, adding 700g of the glass fiber into 1750g of hydrochloric acid with the mass fraction of 10%, stirring and mixing the mixture, standing the mixture, filtering the mixture, collecting filter cakes, washing the filter cakes with deionized water until a washing solution is neutral, drying the filter cakes to obtain porous glass fiber, and mixing the porous glass fiber and the deionized water according to the mass ratio of 11, mixing the mixed porous glass fiber and basalt fiber to prepare modified fiber 2;

preparation example 3

Preparing an asphalt base material: putting 8kg of matrix asphalt into an oven, carrying out heat preservation and heating treatment at 175 ℃ for 30min to obtain preheated asphalt, adding 2kg of SBS rubber particles into the preheated asphalt, carrying out shearing treatment at a shearing rate of 6000rpm/min for 30min in a high-speed shearing instrument, collecting mixed shearing materials, putting the mixed shearing materials into a temperature range of 190 ℃ for swelling for 30min, and collecting a modified asphalt base material 3;

preparing modified wear-resistant powder: taking silicon carbide particles, washing the silicon carbide particles for 5 times by respectively sequentially using 0.1mol/L sodium hydroxide solution and 0.5mol/L hydrochloric acid, washing the silicon carbide particles by using deionized water until the washing liquid is neutral, drying the silicon carbide particles at 85 ℃ to constant weight, collecting pretreated silicon carbide particles, adding 800g of the pretreated silicon carbide particles into 1200g of polyvinylpyrrolidone solution with the mass fraction of 10%, standing for adsorption for 8 hours, filtering, washing and drying to prepare modified wear-resistant powder 3;

preparing modified fiber: 650g SiO₂、300g B₂O₃、100g NaO₂、20g Al₂O₃And 10g Sb₂O₃Stirring and mixing the mixture, placing the mixture in a corundum crucible for heating and melting, drawing the mixture to prepare glass fiber with the diameter of 2mm, adding 900g of the glass fiber into 2000g of hydrochloric acid with the mass fraction of 10%, stirring and mixing the mixture, standing the mixture, filtering the mixture, collecting filter cakes, washing the filter cakes with deionized water until a washing solution is neutral, drying the filter cakes to obtain porous glass fiber, and mixing the porous glass fiber and the basalt fiber which are mixed according to the mass ratio of 1:1 to prepare modified fiber 3;

example 1

Respectively weighing 5.5kg of modified asphalt base material 1, 1kg of fine aggregate, 2.5kg of coarse aggregate, 0.8kg of modified wear-resistant powder 1 and 0.1kg of modified fiber 1, stirring and mixing, collecting to obtain mixed components, preheating the mixed components at 145 ℃, collecting to obtain a preheated mixture, paving the preheated mixture on a road surface while the preheated mixture is hot, controlling the paving thickness to be 1.8cm, cooling the preheated mixture to 90 ℃ after paving is finished, and rolling for 1 time by using an 8T road roller to obtain the asphalt concrete ultrathin wear-resistant surface layer.

Example 2

Respectively weighing 5.8kg of modified asphalt base material 2, 1.2kg of fine aggregate, 2.8kg of coarse aggregate, 1.1kg of modified wear-resistant powder 2 and 0.2kg of modified fiber 2, stirring and mixing, collecting to obtain mixed components, preheating the mixed components at 150 ℃ and collecting to obtain a preheated mixture, paving the preheated mixture on a road surface while the preheated mixture is hot, controlling the paving thickness to be 2.0cm, cooling the preheated mixture to 90 ℃ after paving is finished, and rolling for 1 time by using a 10T road roller to obtain the asphalt concrete ultrathin wear-resistant surface layer.

Example 3

Respectively weighing 6kg of modified asphalt base material 3, 1.5kg of fine aggregate, 3kg of coarse aggregate, 1.3kg of modified wear-resistant powder 3 and 0.3kg of modified fiber 3, stirring and mixing, collecting to obtain mixed components, placing the mixed components at 155 ℃ for preheating treatment and collecting to obtain a preheated mixture, paving the preheated mixture to a road surface while hot, controlling the paving thickness to be 2.2cm, cooling the preheated mixture to 90 ℃ after paving is finished, and rolling for 2 times by adopting a 12T road roller to obtain the asphalt concrete ultrathin wear-resistant surface layer.

Example 4

In example 4, the temperature of the pre-heated mixture was controlled to 120 ℃ during rolling of the pre-heated mixture, and the remaining conditions and components were the same as the components in example 1.

Example 5

In example 5, the temperature of the pre-heated mixture was controlled to 110 ℃ during rolling of the pre-heated mixture, and the other conditions and components were the same as the components in example 1.

Example 6

In example 6, the temperature of the pre-heated mixture was controlled to 100 ℃ during rolling of the pre-heated mixture, and the remaining conditions and components were the same as those in example 1.

Performance test

The water impermeability performance of the asphalt concrete ultrathin wear-resistant surface layers prepared in the embodiments 1 to 6 is respectively detected.

Detection method/test method

And (3) testing the water permeability coefficient of the asphalt concrete ultrathin wear-resistant surface layer according to an asphalt pavement water permeability coefficient testing method (T0971-2008) in Highway subgrade and pavement site testing regulations (JTG E60-2008).

The specific detection results are shown in the following table 1:

table 1 examples 1 to 6 table for testing water permeation resistance

Referring to the comparison of the performance tests of table 1, it can be found that:

the performances of the concrete in the examples 1 to 3 are compared, and the water seepage resistance of the concrete in the example 2 is the most excellent, so that the components in the example 2 are relatively proper in proportion, and the prepared asphalt concrete ultrathin wear-resistant surface layer has good water seepage resistance.

Comparing the performance of the embodiment 1 with that of the embodiments 4 to 6, as the temperature of the preheated mixture during rolling is adjusted in the embodiments 4 to 6, it can be found from table 1 that the higher the temperature is, the higher the water permeability resistance is, which indicates that the application improves the flow performance of the preheated mixture by increasing the rolling temperature of the preheated mixture, so that the preheated mixture can effectively flow and combine and effectively tangle into a compact structure in the rolling process, and thus the prepared asphalt concrete ultrathin wear-resistant surface layer has good water permeability resistance.

Comparative example

Comparative example 1

The direct basalt fiber in the comparative example 1 replaces the modified fiber in the example 1 of the present application, and the rest of the conditions and components are the same as the component ratio of the example 1.

Comparative example 2

In comparative example 2, the modified fiber of example 1 of the present application was replaced with the direct porous glass fiber, and the remaining conditions and components were the same as those of example 1.

Comparative example 3

In comparative example 3, the modified fiber was prepared by mixing the equal mass of mixed non-porous modified glass fiber with basalt fiber, and the remaining conditions and components were the same as those of example 1.

Comparative example 4

In the comparative example 4, no wear-resistant powder is added in the preparation of the asphalt concrete ultrathin wear-resistant surface layer, and the other conditions and components are the same as the component proportion of the example 1.

Comparative example 5

In comparative example 5, the base asphalt was directly used as the base asphalt, and the other conditions and components were the same as those of example 1.

The specific detection results are shown in the following table 2:

TABLE 2 comparative examples 1-5 Performance test Table

Referring to the comparison of the performance tests of table 2, it can be found that:

comparing the comparative examples 1-3 with the embodiment 1, it can be found from table 2 that the components and the structure of the modified fiber are adjusted in the comparative examples 1-3, the water seepage resistance performance all shows a descending trend, and from the water seepage resistance performance test table of the comparative examples 1-3 in table 2, the scheme of directly adopting the porous glass fiber has the worst water seepage resistance performance, which shows that the application adopts the blending entanglement body of the porous fiber and the basalt fiber as the modified material, the blending body formed by the blending entanglement body and the components is effectively interpenetrated and combined to form a good integrated configuration, the framework structure is formed by the entangled modified fiber, the structure of the concrete ultrathin wear-resistant surface layer is effectively stabilized and compacted, so that the lack of the compaction degree of the concrete ultrathin wear-resistant surface layer is improved, the defect of the interlayer bonding effect is reduced, and the water seepage resistance durability of the later-stage concrete surface layer is effectively improved.

Comparing comparative example 4 with example 1, it can be seen that, as the wear-resistant powder is not added in comparative example 4 in the preparation of the asphalt concrete ultrathin wear-resistant surface layer, and the water permeation resistance is significantly reduced as can be seen from table 2, this shows that the modified nanopowder is effectively dispersed in the surface layer material by the good combination effect of polyvinylpyrrolidone and silicon carbide, and the water permeation resistance of the later-stage concrete surface layer is further improved by embedding in the entanglement structure of the modified fiber.

Comparing the performance of the comparative example 5 with that of the example 1, it can be seen that, since the comparative example 5 directly adopts the matrix asphalt as the matrix asphalt and the water permeation resistance is also reduced, this shows that by filling the matrix asphalt with the SBS as the modifying material, the SBS rubber molecules dispersed in the matrix asphalt undergo swelling and partial dissolution reactions under the action of the oil component of the asphalt and then are dispersed in the asphalt matrix in fine particles or filamentous structures, and the rubber and the asphalt both form respective network structures and penetrate each other, so that the SBS rubber material forms a good skeleton structure, thereby effectively improving the mechanical strength of the matrix asphalt and further improving the water permeation resistance of the later stage concrete surface course.

The specific embodiments are only for explaining the present application and are not limiting to the present application, and those skilled in the art can make modifications to the embodiments without inventive contribution as required after reading the present specification, but all the embodiments are protected by patent law within the scope of the claims of the present application.

Claims

1. The anti-seepage asphalt concrete ultrathin wear-resistant surface layer is characterized by comprising the following components in parts by weight:

55-60 parts of matrix asphalt;

10-15 parts of fine aggregate;

25-30 parts of coarse aggregate;

8-13 parts of modified wear-resistant powder;

1-3 parts of modified fiber;

the modified fiber comprises porous glass fiber and basalt fiber which are mixed according to the mass ratio of 1: 1;

the porous glass fiber is prepared by adopting the following scheme:

(1) respectively weighing 60-65 parts of SiO by weight₂25 to 30 parts of B₂O₃8-10 parts of NaO₂1-2 parts of Al₂O₃And 0.5 to 1.0 part of Sb₂O₃Mixing and stirringMixing and placing in a corundum crucible;

(2) placing the corundum crucible in a muffle furnace, heating and melting, drawing to prepare glass fiber, adding the glass fiber into hydrochloric acid, stirring, mixing, standing, filtering, collecting a filter cake, washing, and drying to obtain porous glass fiber;

the modified wear-resistant powder is silicon carbide particles subjected to dispersion modification treatment, and the dispersion modification treatment comprises the following steps:

(1) washing silicon carbide particles with a sodium hydroxide solution and hydrochloric acid respectively in sequence, then washing with deionized water, drying and collecting pretreated silicon carbide particles;

(2) adding the pretreated silicon carbide particles into a polyvinylpyrrolidone solution according to the mass ratio of 5-8: 10-12, standing for adsorption, filtering, washing and drying to prepare the modified wear-resistant powder.

2. The ultra-thin wear-resistant facing layer of asphalt concrete with water seepage resistance according to claim 1, wherein the diameter of the porous glass fiber is 1-2 mm.

3. The ultra-thin wear-resistant surface layer of asphalt concrete with water seepage resistance according to claim 1, characterized in that the matrix asphalt is SBS modified matrix asphalt, and the matrix asphalt is prepared by the following method:

(1) taking matrix asphalt, placing in an oven, and carrying out heat preservation and heating treatment to obtain preheated asphalt;

(2) and adding SBS rubber particles into the preheated asphalt, shearing in a high-speed shearing instrument, collecting the mixed shearing material, placing the mixed shearing material at 175-190 ℃ for swelling for 25-30 min, and collecting the matrix asphalt.

4. The ultra-thin wear-resistant facing layer of water-seepage-resistant asphalt concrete as claimed in claim 3, wherein the shear rate of the shearing treatment in step (2) is 5000-6000 rpm/min.

5. The construction method of the water-seepage-resistant asphalt concrete ultrathin wear-resistant surface layer as claimed in any one of claims 1 to 4, characterized in that the preparation steps comprise:

s1, weighing the matrix asphalt, the fine aggregate, the coarse aggregate, the modified wear-resistant powder and the modified fiber according to the formula, stirring and mixing, and collecting to obtain mixed components;

s2, placing the mixed components at 145-155 ℃ for preheating treatment and collecting to obtain a preheated mixture, and spreading the preheated mixture on the road surface while the preheated mixture is hot;

and S3, after the paving of the preheated mixture is finished, rolling by using a road roller to prepare the asphalt concrete ultrathin wear-resistant surface layer.

6. The construction method of the water-seepage-resistant ultrathin wear-resistant asphalt concrete surface layer as claimed in claim 5, wherein the rolling treatment in the step S3 comprises rolling treatment by a road roller of 8-12T before the preheated mixture is cooled to 90 ℃.