CN114319000A - Thin-layer asphalt pavement bonding layer capable of absorbing stress and construction method thereof - Google Patents
Thin-layer asphalt pavement bonding layer capable of absorbing stress and construction method thereof Download PDFInfo
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Abstract
The invention discloses a thin-layer asphalt pavement bonding layer capable of absorbing stress and a construction method thereof. The construction method comprises the steps of preparing the wheel-sticking-free emulsified asphalt, and then sequentially paving the wheel-sticking-free emulsified asphalt, the composite fiber grating and the wheel-sticking-free emulsified asphalt to form the bonding layer. The bonding layer can be heated under the excitation of microwaves, so that the viscosity of the wheel-sticking-free emulsified asphalt is improved, and the phenomena of upcoating, stripping and the like of a thin-layer asphalt pavement are prevented; and the diffusion stress of the reflection cracks of the lower surface layer and the middle surface layer can be consumed, the load stress of vehicles on the thin-layer asphalt pavement is absorbed, the upward extension of the reflection cracks of the middle and lower surface layers is inhibited, and the service life of the thin-layer asphalt pavement is prolonged.
Description
Technical Field
The invention belongs to the field of bonding layers, and particularly relates to a thin-layer asphalt pavement bonding layer capable of absorbing stress and a construction method thereof.
Background
The adhesive layer is a thin asphalt layer material which is scattered for enhancing the bonding effect among the layers in the asphalt pavement structure, and the adhesive layer has the function of enabling the layers of the asphalt pavement, the newly paved asphalt layer and the old asphalt pavement to be approximately bonded into a whole. When vertical and horizontal loads generated by the action of automobile loads repeatedly act between the asphalt surface layers, the bonding material can resist various stresses generated in the pavement structure, particularly interlaminar shearing force, and can ensure that the asphalt surface layers are not damaged by slippage and the like, so that the excellent pavement performance of the asphalt pavement is ensured, and the service life of the asphalt pavement is prolonged.
Asphalt pavement is generally composed of a lower surface layer, a middle surface layer and an upper surface layer. The lower layer is a cement stabilized gravel layer, which often develops reflective cracks. The reflection crack refers to a joint or a crack of an old cement concrete slab at the lower layer, and due to the continuous change of the environment (mainly temperature) and the repeated action of the wheel load, the displacement is generated, and the crack of the asphalt concrete surface layer appears at the position corresponding to the joint or the crack of the old cement concrete slab. Due to the interlayer adhesion resistance of the old surface layer and the asphalt overlay layer, when the old surface layer plate shrinks due to temperature reduction, the asphalt overlay layer is driven to correspondingly shrink and deform, so that the reflection cracks of the lower surface layer extend upwards. The thin overlay is mainly used on roads with large traffic flow to repair the non-structural damages of large range and quantity of the road surface, including large quantity of longitudinal and transverse cracks, large-area crazing, deep rut deformation, friction coefficient reduction, loosening, aging and other diseases of the road surface, prevent the further deterioration of the road surface, and has the characteristics of improving and improving the anti-skid and anti-rutting capacity of the original road surface, preventing and treating the further aging and hardening of the mixture, improving the road surface smoothness, reducing the road surface noise and the like. The traditional thin-layer overlay technology adopts a hot-mix asphalt mixture, but the thin-layer asphalt pavement is much thinner than a newly-built pavement, so that the bearing capacity is limited, and the heavy-load cart can cause the problems of rutting, cracking, crowding and the like of the pavement, so that the pavement performance and the service life of the thin-layer asphalt overlay are seriously influenced.
In order to solve the above problems, the skilled person has made many attempts, and the improvement methods are mainly divided into two types: increasing the thickness of the asphalt overlay and adding the enhanced additive into the asphalt mixture of the thin-layer pavement. The first method is to increase the thickness of the asphalt overlay, so that the bending rigidity of the pavement structure can be increased, the vertical displacement difference caused by traffic load on two sides of a joint or a crack can be reduced, the research finds that the increase of the thickness of the overlay can reduce the deflection of the joint or the crack of the old pavement, and the deflection of the asphalt concrete overlay with the thickness of each centimeter can be reduced by 2%. However, the technology not only wastes natural resources, but also completes the development of the technology which is not suitable for thin-layer asphalt pavement. The second way is to add the enhanced additive into the thin-layer asphalt mixture, which is an important way to solve the problem of insufficient bearing capacity of the thin-layer asphalt pavement. But the admixtures are various in types, poor in compatibility with asphalt, high in temperature for mixing and high in requirements for the production process of the thin-layer pavement asphalt mixture.
Therefore, the damage of the thin-layer asphalt pavement caused by the thin-layer asphalt overlay load stress and the next-layer reflection crack extension stress cannot be fundamentally solved by adopting any method. Therefore, a thin pavement adhesive layer which can better disperse the impact stress and high vibration stress applied to the rolled part to the non-rolled part, improve the durability of the pavement and has strong adhesion is needed.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a thin-layer asphalt pavement bonding layer with an upper non-stick wheel emulsified asphalt layer and a lower non-stick wheel emulsified asphalt layer wrapping a middle composite fiber grid layer, wherein the bonding layer can reduce stress concentration, and can improve the temperature of the non-stick wheel emulsified asphalt through the composite fiber grid layer so as to increase the viscosity of the bonding layer;
the second object of the present invention is to provide a method for constructing the adhesive layer.
The technical scheme is as follows: the thin-layer asphalt pavement bonding layer capable of absorbing stress is of a sandwich structure formed by wrapping composite fiber gratings in the middle by emulsified asphalt of an upper non-stick wheel and a lower non-stick wheel;
the wheel-sticking-free emulsified asphalt comprises the following raw materials in parts by weight: 35-50 parts of matrix asphalt, 1-5 parts of water-based resin, 5-10 parts of asphalt mixing agent, 2-6 parts of asphalt emulsifier, 0.5-1 part of emulsified asphalt stabilizer and 4-8 parts of SBS water emulsion; the composite fiber grid layer is formed by weaving microwave absorption fibers and glass fibers.
The bonding layer is of a sandwich structure formed by combining upper and lower non-stick wheel emulsified asphalt and middle composite fiber grids, wherein the middle composite fiber grid is formed by interweaving warp-wise grid strips and weft-wise grid strips which are vertical to each other and are formed by microwave absorption fibers and glass fibers, and can release heat and accelerate the heat to be transferred to other areas under the excitation of microwaves, so that the temperature of the upper and lower non-stick wheel emulsified asphalt can be increased, the viscosity is increased, and the phenomena of upcoating, stripping and the like of the upper surface layer of a thin-layer asphalt pavement are prevented; meanwhile, the stress of compression and tension can be dispersed, so that the diffusion stress of the reflection cracks of the lower surface layer and the middle surface layer is dispersed and transferred, the load stress of vehicles on the thin-layer asphalt pavement, which is applied to the upper surface layer, is absorbed, the upward extension of the reflection cracks of the middle and lower surface layers is restrained, and the service life of the thin-layer asphalt pavement is prolonged. Preferably, the base asphalt of the bonding layer can be 35 to 50 parts, the water-based resin can be 2 parts, the asphalt mixing agent can be 6 parts, the asphalt emulsifier can be 3 parts, the emulsified asphalt stabilizer can be 0.5 part, and the SBS water emulsion can be 5 to 8 parts; the composite fiber grid layer can be formed by weaving 20-35 parts of microwave absorbing fibers and 65-80 parts of glass fibers.
Further, the base asphalt of the tie coat may be a petroleum asphalt having a penetration of 50 to 100 dmm.
Further, the aqueous resin of the adhesive layer may include an aqueous urethane resin or an aqueous acrylic resin.
Furthermore, the asphalt mixing agent of the bonding layer at least comprises one of pure acrylic emulsion, vinyl acetate-acrylic emulsion, styrene-acrylic emulsion, polyurethane emulsion, silicone-acrylic emulsion, polyvinyl acetate emulsion, vinyl acetate-ethylene copolymer emulsion or neoprene emulsion.
Furthermore, the asphalt emulsifier of the bonding layer at least comprises one of quaternary ammonium salt, polyvinyl alcohol or sodium dodecyl sulfate.
Further, the emulsified asphalt stabilizer of the bonding layer can be methyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose or modified starch.
Furthermore, the SBS water emulsion of the bonding layer comprises linear SBS with the weight portion ratio of 8-15:0.5-1.5:86-90, emulsifier and water, wherein the emulsifier is sodium dodecyl sulfate.
Further, the microwave absorbing fibers of the bonding layer may be carbon fibers and/or steel fibers.
The construction method of the thin asphalt pavement bonding layer capable of absorbing stress comprises the following steps:
(1) preparing wheel-sticking-free emulsified asphalt: heating the matrix asphalt to 160-180 ℃, sequentially adding an asphalt mixing agent and an emulsified asphalt stabilizer, and stirring to obtain modified asphalt; mixing and diluting an asphalt emulsifier, SBS water emulsion and water-based resin to obtain a soap solution; adjusting the temperature of the modified asphalt to 160-170 ℃, and adjusting the temperature of the soap solution to 40-50 ℃, and mixing the modified asphalt and the soap solution to prepare wheel-sticking-free emulsified asphalt;
(2) laying a bonding layer: and sequentially paving the non-stick wheel emulsified asphalt on the base surface from bottom to top to form a lower non-stick wheel emulsified asphalt layer, a composite fiber grid to form a grid layer and an upper non-stick wheel emulsified asphalt layer.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages: the thin-layer asphalt pavement bonding layer can be heated under the excitation of microwaves, so that the viscosity of the wheel-sticking-free emulsified asphalt is improved, and the phenomena of upcoating, stripping and the like of the upper surface layer of the thin-layer asphalt pavement are prevented; and the diffusion stress of the reflection cracks of the lower surface layer and the middle surface layer can be consumed, the load stress of vehicles on the thin-layer asphalt pavement is absorbed, the upward extension of the reflection cracks of the middle and lower surface layers is inhibited, and the service life of the thin-layer asphalt pavement is prolonged.
Drawings
FIG. 1 is a schematic structural view of a thin asphalt pavement bonding layer.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the following embodiments and the accompanying drawings. The materials, reagents and the like used in the present invention are commercially available.
As shown in fig. 1, the thin asphalt pavement bonding layer of the present invention sequentially comprises, from top to bottom, an upper wheel-free emulsified asphalt 1, a composite fiber grid layer 2, and an upper wheel-free emulsified asphalt 3. The composite fiber grid layer of the middle layer is formed by weaving microwave absorption fibers and glass fibers in a warp direction and a weft direction which are perpendicular to each other.
Example 1
The components and contents of the thin asphalt pavement bonding layer of this example are shown in table 1 below. Wherein the SBS water emulsion is formed by mixing linear SBS, sodium dodecyl sulfate and water in a weight ratio of 10:1: 89.
TABLE 1 thin-layer asphalt pavement binding layer component content
The construction process of the thin asphalt pavement bonding layer of the embodiment comprises the following steps:
(1) preparing wheel-sticking-free emulsified asphalt: firstly, heating matrix asphalt to 170 ℃, sequentially adding an asphalt mixing agent and an emulsified asphalt stabilizer, and stirring to obtain modified asphalt; diluting the asphalt emulsifier, the SBS water emulsion and the water-based resin with 48 parts of water, adding hydrochloric acid, adjusting the pH value to 2, and preparing a soap solution; adjusting the temperature of the modified asphalt to 165 ℃, adjusting the temperature of the soap solution to 50 ℃, and mixing the modified asphalt and the soap solution to obtain wheel-sticking-free emulsified asphalt;
(2) laying a sandwich bonding layer: cleaning a base surface, paving a first layer of non-stick wheel emulsified asphalt, placing a square plate on the base surface during spraying to measure the spraying amount, and longitudinally and transversely connecting the base surface and the sprayed part to overlap at least 10 cm; then, paving a second layer of grid, and uniformly paving a composite fiber grid layer on the first layer of non-stick wheel emulsified asphalt; and finally, paving a third layer of wheel-sticking-free emulsified asphalt, wherein the curing time of the wheel-sticking-free emulsified asphalt is not less than 60min, and ensuring that the wheel-sticking-free emulsified asphalt is completely demulsified.
Example 2
The components and contents of the thin asphalt pavement bonding layer of this example are shown in table 2 below. Wherein the SBS water emulsion is formed by mixing linear SBS, sodium dodecyl sulfate and water according to the weight percentage ratio of 10:1: 89.
TABLE 2 thin asphalt pavement bonding layer component content
The construction process of the thin asphalt pavement bonding layer of the embodiment comprises the following steps:
(1) preparing wheel-sticking-free emulsified asphalt: firstly, heating matrix asphalt to 170 ℃, sequentially adding an asphalt mixing agent and an emulsified asphalt stabilizer, and stirring to obtain modified asphalt; diluting the asphalt emulsifier, the SBS water emulsion and the water-based resin with 48 parts of water, adding hydrochloric acid, adjusting the pH value to 2, and preparing a soap solution; adjusting the temperature of the modified asphalt to 165 ℃, adjusting the temperature of the soap solution to 50 ℃, and mixing the modified asphalt and the soap solution to obtain wheel-sticking-free emulsified asphalt;
(2) laying a sandwich bonding layer: cleaning a base surface, paving a first layer of non-stick wheel emulsified asphalt, placing a square plate on the base surface during spraying to measure the spraying amount, and longitudinally and transversely connecting the base surface and the sprayed part to overlap at least 10 cm; then, paving a second layer of grid, and uniformly paving a composite fiber grid layer on the first layer of non-stick wheel emulsified asphalt; and finally, paving a third layer of wheel-sticking-free emulsified asphalt, wherein the curing time of the wheel-sticking-free emulsified asphalt is not less than 60min, and ensuring that the wheel-sticking-free emulsified asphalt is completely demulsified.
Example 3
The components and contents of the thin asphalt pavement bonding layer of this example are shown in table 3 below. Wherein the SBS water emulsion is formed by mixing linear SBS, sodium dodecyl sulfate and water according to the weight percentage ratio of 10:1: 89.
TABLE 3 thin asphalt pavement bonding layer component content
The construction steps of the thin asphalt pavement bonding layer of the embodiment are as follows:
(1) preparing wheel-sticking-free emulsified asphalt: firstly, heating matrix asphalt to 170 ℃, sequentially adding an asphalt mixing agent and an emulsified asphalt stabilizer, and stirring to obtain modified asphalt; diluting the asphalt emulsifier, the SBS water emulsion and the water-based resin with 48 parts of water, adding hydrochloric acid, adjusting the pH value to 2, and preparing a soap solution; adjusting the temperature of the modified asphalt to 165 ℃, adjusting the temperature of the soap solution to 50 ℃, and mixing the modified asphalt and the soap solution to obtain wheel-sticking-free emulsified asphalt;
(2) laying a sandwich bonding layer: cleaning a base surface, paving a first layer of non-stick wheel emulsified asphalt, placing a square plate on the base surface during spraying to measure the spraying amount, and longitudinally and transversely connecting the base surface and the sprayed part to overlap at least 10 cm; then, paving a second layer of grid, and uniformly paving a composite fiber grid layer on the first layer of non-stick wheel emulsified asphalt; and finally, paving a third layer of non-stick wheel emulsified asphalt: the curing time of the wheel-sticking-free emulsified asphalt is not less than 60min, and complete demulsification of the wheel-sticking-free emulsified asphalt is ensured.
Performance detection
The above examples were subjected to the correlation performance test, and the obtained results are shown in table 4 below.
Table 4 table of performance data obtained in examples 1 to 3
TABLE 5 road Performance data tables for examples 1 to 3
As shown in tables 4 and 5, three groups of examples of the thin asphalt pavement bonding layer capable of absorbing stress of the invention have very strong pull strength, can tightly bond the upper thin asphalt pavement and the middle pavement, and effectively resist the problems of asphalt pavement spalling, upwrapping and the like; and the three groups of examples have better storage stability, and have no obvious phenomena of segregation, delamination and the like within 5 days.
The data in table 5 show that compared with the original pavement, the reflection cracks of the examples are far lower than those of the original pavement after one year and two years, compared with the 16 reflection crack densities of the third group of examples after two years, the reflection cracks of the original pavement are as high as 129 reflection cracks per kilometer, and the result shows that the thin asphalt pavement bonding layer capable of absorbing stress can effectively resist the upward reflection of the reflection cracks of the lower layer, and has the obvious effect of absorbing stress.
Example 4
The components and contents of the thin asphalt pavement bonding layer of this example are shown in table 6 below. Wherein the SBS water emulsion is prepared by mixing linear SBS, sodium dodecyl sulfate and water according to the weight percentage ratio of 15:1.5: 90.
TABLE 6 thin asphalt pavement binding layer component content
The construction steps of the thin asphalt pavement bonding layer of the embodiment are as follows:
(1) preparing wheel-sticking-free emulsified asphalt: firstly, heating the matrix asphalt to 160 ℃, sequentially adding an asphalt mixing agent and an emulsified asphalt stabilizer, and stirring to obtain modified asphalt; diluting the asphalt emulsifier, the SBS water emulsion and the water-based resin with 48 parts of water, adding hydrochloric acid, and adjusting the pH value to 2 to prepare a soap solution; adjusting the temperature of the modified asphalt to 160 ℃, adjusting the temperature of the soap solution to 40 ℃, and mixing the modified asphalt and the soap solution to obtain wheel-sticking-free emulsified asphalt;
(2) laying a sandwich bonding layer: firstly, cleaning a base surface, paving a first layer of non-stick wheel emulsified asphalt: during spraying, a square plate is placed on the base surface to measure the spraying amount, and the longitudinal and transverse connection is overlapped with the sprayed part by not less than 10 cm; then paving a second layer of grids: uniformly paving a composite fiber grid layer on the first layer of non-stick wheel emulsified asphalt; and finally, paving a third layer of non-stick wheel emulsified asphalt: the curing time of the wheel-sticking-free emulsified asphalt is not less than 60min, and complete demulsification of the wheel-sticking-free emulsified asphalt is ensured.
Example 5
The components and contents of the thin asphalt pavement bonding layer of this example are shown in table 7 below. Wherein the SBS water emulsion is prepared by mixing linear SBS with the weight percentage ratio of 8:0.5:86, sodium dodecyl sulfate and water.
TABLE 7 thin asphalt pavement bonding layer component content
The construction steps of the thin asphalt pavement bonding layer of the embodiment are as follows:
(1) preparing wheel-sticking-free emulsified asphalt: firstly, heating matrix asphalt to 180 ℃, sequentially adding an asphalt mixing agent and an emulsified asphalt stabilizer, and stirring to obtain modified asphalt; diluting the asphalt emulsifier, the SBS water emulsion and the water-based resin with 48 parts of water, adding hydrochloric acid, adjusting the pH value to 2, and preparing a soap solution; adjusting the temperature of the modified asphalt to 170 ℃, adjusting the temperature of the soap solution to 50 ℃, and mixing the modified asphalt and the soap solution to obtain wheel-sticking-free emulsified asphalt;
(2) laying a sandwich bonding layer: cleaning a base surface, paving a first layer of non-stick wheel emulsified asphalt, placing a square plate on the base surface during spraying to measure the spraying amount, and longitudinally and transversely connecting the base surface and the sprayed part to overlap at least 10 cm; then, paving a second layer of grid, and uniformly paving a composite fiber grid layer on the first layer of non-stick wheel emulsified asphalt; and finally, paving a third layer of wheel-sticking-free emulsified asphalt, wherein the curing time of the wheel-sticking-free emulsified asphalt is not less than 60min, and ensuring that the wheel-sticking-free emulsified asphalt is completely demulsified
Similarly, the performance tests of the embodiment 4 and the embodiment 5 show that the bonding layer has strong pull strength, can tightly bond the upper thin asphalt pavement and the middle pavement, and effectively resist the problems of asphalt pavement peeling, upwrapping and the like; meanwhile, the three groups of examples have better storage stability, and have no obvious phenomena of segregation, delamination and the like within 5 days. In addition, the reflection cracks of one year and two years are far lower than those of the original pavement, the upward reflection of the reflection cracks of the lower surface layer can be effectively resisted, and the effect of obvious absorption stress is achieved.
In addition to the above examples, the asphalt blending agent used in the tie layer of the present invention may further include at least one of vinyl acetate-vinyl acetate copolymer emulsion, styrene-acrylic emulsion, silicone-acrylic emulsion, or chloroprene latex. The asphalt emulsifier can be two or three of quaternary ammonium salt, polyvinyl alcohol or lauryl sodium sulfate. The emulsified asphalt stabilizer can also be modified starch. The microwave absorbing fiber may be a mixed fiber of carbon fiber and steel fiber.
Claims (10)
1. A thin-layer asphalt pavement bonding layer capable of absorbing stress is characterized in that: the bonding layer is a sandwich structure formed by wrapping an upper non-stick wheel emulsified asphalt and a lower non-stick wheel emulsified asphalt with a middle composite fiber grid;
the wheel-sticking-free emulsified asphalt comprises the following raw materials in parts by weight: 35-50 parts of matrix asphalt, 1-5 parts of water-based resin, 5-10 parts of asphalt mixing agent, 2-6 parts of asphalt emulsifier, 0.5-1 part of emulsified asphalt stabilizer and 4-8 parts of SBS water emulsion; the composite fiber grid layer is formed by weaving 20-45 parts of microwave absorbing fibers and 55-80 parts of glass fibers.
2. The thin stress-absorbable asphalt pavement bonding layer according to claim 1, wherein: 35-50 parts of matrix asphalt, 2 parts of water-based resin, 6 parts of asphalt mixing agent, 3 parts of asphalt emulsifier, 0.5 part of emulsified asphalt stabilizer and 5-8 parts of SBS water emulsion; the composite fiber grid layer is formed by weaving 20-35 parts of microwave absorbing fibers and 65-80 parts of glass fibers.
3. The thin stress-absorbable asphalt pavement bonding layer according to claim 1, wherein: the matrix asphalt is petroleum asphalt with penetration degree of 50-100 dmm.
4. The thin stress-absorbable asphalt pavement bonding layer according to claim 1, wherein: the water-based resin comprises water-based polyurethane resin or water-based acrylic resin.
5. The thin stress-absorbable asphalt pavement bonding layer according to claim 1, wherein: the asphalt mixing agent at least comprises one of pure acrylic emulsion, vinyl acetate acrylic emulsion, styrene-acrylic emulsion, polyurethane emulsion, silicone acrylic emulsion, polyvinyl acetate emulsion, vinyl acetate-ethylene copolymer emulsion or neoprene emulsion.
6. The thin stress-absorbable asphalt pavement bonding layer according to claim 1, wherein: the asphalt emulsifier at least comprises one of quaternary ammonium salt, polyvinyl alcohol or lauryl sodium sulfate.
7. The thin stress-absorbable asphalt pavement bonding layer according to claim 1, wherein: the emulsified asphalt stabilizer is methyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose or modified starch.
8. The thin stress-absorbable asphalt pavement bonding layer according to claim 1, wherein: the SBS water emulsion comprises linear SBS in the weight ratio of 8-15:0.5-1.5:86-90, emulsifier and water, wherein the emulsifier is sodium dodecyl sulfate.
9. The thin stress-absorbable asphalt pavement bonding layer according to claim 1, wherein: the microwave absorbing fibers are carbon fibers and/or steel fibers.
10. The method of constructing a thin stress-absorbable asphalt pavement bonding layer according to claim 1, comprising the steps of:
(1) preparing wheel-sticking-free emulsified asphalt: heating the matrix asphalt to 160-180 ℃, sequentially adding an asphalt mixing agent and an emulsified asphalt stabilizer, and stirring to obtain modified asphalt; mixing and diluting an asphalt emulsifier, SBS water emulsion and water-based resin to obtain a soap solution; adjusting the temperature of the modified asphalt to 160-170 ℃, and adjusting the temperature of the soap solution to 40-50 ℃, and mixing the modified asphalt and the soap solution to prepare wheel-sticking-free emulsified asphalt;
(2) laying a bonding layer: and sequentially paving the non-stick wheel emulsified asphalt on the base surface from bottom to top to form a lower non-stick wheel emulsified asphalt layer, a composite fiber grid to form a grid layer and an upper non-stick wheel emulsified asphalt layer.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024129869A1 (en) * | 2022-12-15 | 2024-06-20 | Basf Corporation | Modified asphalt compositions containing vinyl acetate latexes and methods for making same |
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