CN115340772A - High-viscosity high-elasticity modified emulsified asphalt, preparation method thereof and construction method of cold-mixing ultrathin overlay - Google Patents
High-viscosity high-elasticity modified emulsified asphalt, preparation method thereof and construction method of cold-mixing ultrathin overlay Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
- C08L95/005—Aqueous compositions, e.g. emulsions
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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
- E01C7/353—Toppings or surface dressings; Methods of mixing, impregnating, or spreading them with exclusively bituminous binders; Aggregate, fillers or other additives for application on or in the surface of toppings with exclusively bituminous binders, e.g. for roughening or clearing
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
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- C08J2409/00—Characterised by the use of homopolymers or copolymers of conjugated diene hydrocarbons
- C08J2409/06—Copolymers with styrene
- C08J2409/08—Latex
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2429/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
- C08J2429/02—Homopolymers or copolymers of unsaturated alcohols
- C08J2429/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
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- C08J2453/00—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
- C08J2453/02—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers of vinyl aromatic monomers and conjugated dienes
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- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/16—Halogen-containing compounds
- C08K2003/162—Calcium, strontium or barium halides, e.g. calcium, strontium or barium chloride
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Abstract
The invention provides a preparation method of high-viscosity high-elasticity modified emulsified asphalt, which comprises the following steps: s1, heating 83-93.5 parts by weight of matrix asphalt to 170-190 ℃, then adding 3-8 parts by weight of SBS, 1-3 parts by weight of aromatic oil, 0.5-2 parts by weight of tackifier c9 and 0.5-2 parts by weight of tackifier terpene, continuously heating to 180-190 ℃ and keeping for 8-15min, then carrying out colloid mill shearing, guiding into a reaction tank after shearing, and keeping the temperature at 170-190 ℃ for 3-7h to prepare SBS modified asphalt; s2, adding water to dissolve 4-9 parts by weight of cationic emulsifier, 0.1-0.2 part by weight of calcium chloride and 0.1-0.2 part by weight of polyvinyl alcohol to prepare emulsifier aqueous solution; s3, shearing and emulsifying 60-70 parts by weight of SBS modified asphalt and 40-30 parts by weight of emulsifier aqueous solution; s4, continuously adding 2.5 parts by weight of SBR styrene-butadiene rubber latex into the storage tank in the S3. The performance of the high-viscosity high-elasticity modified emulsified asphalt obtained by the invention is improved, and the modified emulsified asphalt can be used for a construction method of a cold-mixing ultrathin cover surface.
Description
Technical Field
The invention relates to the technical field of modified emulsified asphalt, in particular to high-viscosity high-elasticity modified emulsified asphalt, a preparation method thereof and a construction method of a cold-mixing ultrathin cover surface.
Background
The emulsified asphalt is prepared by hot melting asphalt, forming tiny particles by mechanical action such as high-speed centrifugation, stirring, shearing and the like, and is uniformly dissolved in an emulsifier aqueous solution to form an oil-in-water or water-in-oil emulsion, and is widely used for permeable coatings, adhesive coatings, slurry sealing, micro-surfacing, pavement regeneration and the like. The emulsified asphalt does not need to be heated in use, stone does not need to be heated, and the emulsified asphalt has the advantages of simple construction, low cost, low carbon, energy conservation and the like, but the performance of evaporation residues of the emulsified asphalt is reduced due to the addition of the emulsifier in the emulsified asphalt and the mechanical shearing action, and the emulsified asphalt can be modified in many times in order to improve the performance of the emulsified asphalt.
The most common method for modifying emulsified asphalt is to add SBR latex, which has good low-temperature performance but has limited effect on improving the high-temperature performance of asphalt. There is also a method of directly emulsifying the SBS modified asphalt, but the SBS modified asphalt is difficult to emulsify when the SBS addition amount exceeds 3.5%, and the stability of the emulsified asphalt is poor. The two modification methods are widely and relatively mature in application, but when the emulsified asphalt obtained by the two modification methods is applied to high-performance pavements, the performances of the emulsified asphalt in the aspects of cohesiveness, durability, high-temperature stability and low-temperature crack resistance are insufficient, so that the application of the emulsified asphalt is limited.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a preparation method of high-viscosity high-elasticity modified emulsified asphalt, which greatly improves the performance of the modified emulsified asphalt and has better cohesiveness, durability, high-temperature stability and low-temperature crack resistance compared with the traditional modified emulsified asphalt.
According to the embodiment of the invention, the preparation method of the high-viscosity high-elasticity modified emulsified asphalt comprises the following steps:
s1, heating 83-93.5 parts by weight of matrix asphalt to 170-190 ℃, adding 3-8 parts by weight of SBS, 1-3 parts by weight of aromatic oil, 0.5-2 parts by weight of tackifier c9 and 0.5-2 parts by weight of tackifier terpene, continuously heating to 180-190 ℃ and keeping for 8-15min, then carrying out colloid mill shearing, introducing into a reaction tank after shearing, keeping the temperature for 3-7h at 170-190 ℃, adding 0.05-0.15 part by weight of sulfide during the heat preservation period and stirring with 300-500r/min to prepare SBS modified asphalt;
s2, adding water to dissolve 4-9 parts by weight of cationic emulsifier, 0.1-0.2 part by weight of calcium chloride and 0.1-0.2 part by weight of polyvinyl alcohol, adjusting the pH value to 1.8-2.5, heating to 50-80 ℃, and uniformly stirring to obtain an emulsifier aqueous solution;
s3, shearing and emulsifying 60-70 parts by weight of SBS modified asphalt and 40-30 parts by weight of emulsifier aqueous solution together, and then introducing into a storage tank;
and S4, continuously adding 2.5 parts by weight of SBR (styrene butadiene rubber) latex into the storage tank in the S3, and uniformly stirring to obtain the high-viscosity high-elasticity modified emulsified asphalt.
Further, colloid cutting in S1 and cutting and emulsifying in S3 are both carried out by adopting a colloid mill, wherein the rotating speed of the colloid mill in S1 is 5000-8000r/min, and the rotating speed of the colloid mill in S3 is 3800-5500r/min.
Further, the sulfide includes one or two of sulfur, tetramethylthiuram monosulfide, dipentamethylenethiuram tetrasulfide.
Further, the cationic emulsifier includes one of slow-breaking and fast-breaking emulsifiers.
Further, the base asphalt includes 70# road petroleum asphalt.
According to another embodiment of the present invention, the present invention also provides another preparation method, wherein S3 and S4 in the former preparation method are replaced with:
and S3, shearing and emulsifying 60-70 parts by weight of SBS modified asphalt, 40-30 parts by weight of emulsifier aqueous solution and 5-6.5 parts by weight of SBR latex together, and then introducing into a storage tank to obtain the high-viscosity high-elasticity modified emulsified asphalt.
The invention also provides the high-viscosity high-elasticity modified emulsified asphalt prepared by the two preparation methods.
The invention also provides a construction method of the cold-mixed ultrathin overlay, which adopts the high-viscosity high-elasticity modified emulsified asphalt to mix with aggregate and then pave the pavement.
Further, before paving the road surface, spreading a layer of high-viscosity emulsified asphalt adhesive layer on the road surface, wherein the spreading amount is 0.3-0.4kg/m 2 。
Further, the paving thickness is 1.5-2.5 times of the maximum particle size of the aggregate.
Compared with the prior art, the invention has the following beneficial effects:
the high-viscosity high-elasticity modified emulsified asphalt produced by the invention has strong binding power, good high-temperature deformation resistance and low-temperature crack resistance, the softening point of the evaporation residue is not less than 80 ℃, the elastic recovery is not less than 95 percent (25 ℃), the dynamic viscosity is not less than 20000pa.s (60 ℃), and the main index reaches or is higher than the technical standard of high-viscosity high-elasticity modified asphalt (GB/T30516-2014);
the high-viscosity high-elasticity modified emulsified asphalt is used for paving a road surface to form an ultrathin finish coat, so that the performance of the road surface can reach various indexes of the ultrathin finish coat, and the high-viscosity high-elasticity modified emulsified asphalt has the characteristics of simple construction, low cost, low noise, good comfort, good durability, low carbon and energy conservation.
Detailed Description
The technical solution of the present invention is further illustrated by the following examples.
Example 1
The embodiment provides a high-viscosity high-elasticity modified emulsified asphalt, which comprises the following preparation steps:
s1, heating 93.5g of No. 70 asphalt to 170 ℃, adding 3g of SBS, 1g of aromatic oil, 0.5g of tackifier c9 and 0.5g of tackifier terpene t60, and stirring at 300r/min for later use;
s2, continuously heating the product obtained in the step S1 to 180 ℃, keeping the temperature for 15min, then shearing the product by a modified asphalt colloid mill of 5000r/min, feeding the cut product into a reaction tank, keeping the temperature at 170 ℃ for 7 hours, adding 0.05g of sulfur by weight to prepare SBS modified asphalt, and stirring the obtained product at 300 r/min;
s3, adding water to dissolve 4g of cationic slow-breaking quick-setting emulsifier, 0.1g of calcium chloride and 0.1g of polyvinyl alcohol, adjusting the pH value to 1.8, heating to 50 ℃, and uniformly stirring to prepare an emulsifier aqueous solution;
s4, putting 60g of the S2 product and 40g of the S3 product into an emulsified asphalt colloid mill together for emulsification, wherein the motor of the colloid mill requires 50KW and the rotating speed is 3800r/min, the emulsifying equipment is provided with a 1.5MP radiator, and the radiating area is more than 40m 2 Controlling the discharging temperature of the emulsion to be 82 ℃ to obtain the modified emulsified asphalt;
and S5, adding 2.5g of SBR (styrene butadiene rubber) latex in parts by weight into a storage tank of the product obtained in the S4, and uniformly stirring to obtain the high-viscosity high-elasticity modified emulsified asphalt.
Example 2
The embodiment provides a high-viscosity high-elasticity modified emulsified asphalt, which comprises the following preparation steps:
s1, heating 93.5g of No. 70 asphalt to 180 ℃, then adding 4.5g of SBS, 1.5g of aromatic oil, 1g of tackifier c9 and 1g of tackifier terpene t60, and stirring at 300r/min for later use;
s2, continuously heating the product obtained in the step S1 to 185 ℃, keeping the temperature for 10min, then shearing the product through a modified asphalt colloid mill of 6500r/min, putting the sheared product into a reaction tank, keeping the temperature at 180 ℃ for 5 hours, adding 0.1g of tetramethyl thiuram monosulfide by weight, and preparing SBS modified asphalt while stirring at 300 r/min;
s3, adding water to dissolve 6.25g of cationic slow-breaking quick-setting emulsifier, 0.15g of calcium chloride, 0.15g of polyvinyl alcohol and 6.5g of SBR (styrene butadiene rubber) latex, adjusting the pH value to 2.0, heating to 65 ℃, and uniformly stirring to prepare an emulsifier aqueous solution;
s4, putting 62g of the S2 product and 38g of the S3 product into an emulsified asphalt colloid mill together for emulsification, wherein the motor of the colloid mill requires 50KW, the rotating speed is 4500r/min, the emulsifying equipment is provided with a 1.5MP radiator, and the heat dissipation area is more than 40m 2 And controlling the discharging temperature of the emulsion to be 82 ℃ to obtain the high-viscosity high-elasticity modified emulsified asphalt.
Example 3
The embodiment provides a high-viscosity high-elasticity modified emulsified asphalt, which comprises the following preparation steps:
s1, heating 87.0g of No. 70 asphalt to 185 ℃, adding 6g of SBS, 3g of aromatic oil, 1.5g of tackifier c9 and 1.5g of tackifier terpene t60, and stirring at 300r/min for later use;
s2, continuously heating the product obtained in the step S1 to 190 ℃, keeping the temperature for 8min, then shearing the product by a modified asphalt colloid mill at 8000r/min, feeding the cut product into a reaction tank, keeping the temperature at 190 ℃ for 3 hours, adding 0.15g of dipentaerythritol thiuram tetrasulfide to prepare SBS modified asphalt, and stirring the SBS modified asphalt at 400 r/min;
s3, adding water to dissolve 5.8g of cationic fast-cracking emulsifier, 0.2g of calcium chloride, 0.2g of polyvinyl alcohol and 5.5g of SBR (styrene butadiene rubber) latex, adjusting the pH value to 2.0, heating to 65 ℃, and uniformly stirring to prepare an emulsifier aqueous solution;
s4, 65g parts by weight of the product obtained in S2 and 35g parts by weight of the product obtained in S3 are added togetherEmulsifying in an emulsified asphalt colloid mill, wherein the motor of the colloid mill requires 50KW, the rotating speed is 5000r/min, the pressure of a radiator of emulsifying equipment is 1.5MP, and the heat dissipation area is more than 40m 2 And the discharging temperature of the emulsion is 78 ℃, thus obtaining the high-viscosity high-elasticity modified emulsified asphalt.
Example 4
The embodiment provides a high-viscosity high-elasticity modified emulsified asphalt, which comprises the following preparation steps:
s1, heating 83.0g of No. 70 asphalt to 180 ℃, adding 8g of SBS, 3g of aromatic oil, 2g of tackifier c9 and 2g of tackifier terpene t60, and stirring at 300r/min for later use;
s2, continuously heating the product obtained in the step S1 to 190 ℃, keeping the temperature for 8min, then shearing the product by a modified asphalt colloid mill at 8000r/min, putting the cut product into a reaction tank, keeping the temperature for 5 hours at 180 ℃, adding 0.05g of sulfur and 0.05g of dipentaerythritol thiuram tetrasulfide to prepare SBS modified asphalt, and stirring the mixture at 500 r/min;
s3, adding water to dissolve 9g of cationic slow-breaking quick-setting emulsifier, 0.2g of calcium chloride, 02g of polyvinyl alcohol and 5g of SBR (styrene butadiene rubber) latex, adjusting the pH value to 1.8, heating to 75 ℃, and uniformly stirring to prepare an emulsifier aqueous solution;
s4, putting 70g of the S2 product and 30g of the S3 product into an emulsified asphalt colloid mill together for emulsification, wherein the colloid mill motor requires 50KW, the rotating speed is 5500r/min, the radiator pressure of an emulsification device is 1.5MP, and the heat dissipation area is 40m 2 And controlling the discharging temperature of the emulsion to 83.5 ℃ to obtain the high-viscosity high-elasticity modified emulsified asphalt.
The performance of the high-viscosity high-elasticity modified emulsified asphalt is tested, and the obtained results are shown in the following table:
note: the detection method comprises T0651, T0604, T0605, T0606, T0662, T0620 and T0655.
The high-viscosity high-elasticity modified emulsified asphalt provided in the above examples 1 to 4 greatly improves the performance of the modified emulsified asphalt, has better cohesiveness, durability, high-temperature stability and low-temperature crack resistance compared with the conventional modified emulsified asphalt, and the evaporation residue of the emulsified asphalt can reach or exceed the technical standard of "high-viscosity high-elasticity modified asphalt" (GB/T30516-2014).
The high-viscosity high-elasticity modified emulsified asphalt provided by the above examples 1 to 4 is adopted for cold-mixing ultrathin overlay construction, and the aggregate is graded into CPA-7 or CPA-10 by mineral aggregate; skeleton-compact SMA-10 or SMA-5, UTOD-5; compact-suspended AC-5 or AC-10; the gap type UTO-5 or UTO-10, UTO-13, OGFC-10, OGFC-5 and the like (3-5 mm or 5-8mm single graded aggregate can be added with 3-8% of mineral powder to pave a permeable pavement and then pave, so that grading types are diversified and application of different occasions and functions are realized), the gap type UTO-5 or UTO-10, UTO-13, OGFC-10, OGFC-5 and the like are mixed with the high-viscosity high-elasticity modified emulsified asphalt provided by the embodiment 1-4 and then pave, the paving thickness is 1.5-2.5 times of the maximum particle size of the aggregate, which is greatly different from the micro-surfacing, the paving thickness at the micro-surfacing is the thickness of the maximum particle size and is up to the ground, so that the noise of the pavement is great, the thickness of a cold-mixing ultra-thin grinding paving layer is larger than the maximum particle size of stone, the stone is rolled by a roller, the stone is rearranged to form a stable mosaic structure, the noise of the pavement is reduced, and the driving comfort is greatly improved; further, before paving the road surface, spreading a layer of high-viscosity emulsified asphalt adhesive layer on the road surface, wherein the spreading amount is 0.3-0.4kg per square meter; the construction method with mature micro-surfacing replaces the traditional ultra-thin overlay mixing plant to mix the asphalt paver for paving, so that the mixing and paving can be completed at one time, the cold mixing and cold paving are realized, the construction is simple, the carbon is low, and the energy is saved; the invention combines the two technologies of the ultrathin overlay and the micro-surfacing, fully exerts the respective advantages, achieves the pavement performance to various indexes of the ultrathin overlay, and has the characteristics of simple construction, low cost, low noise, good comfort, good durability, low carbon and energy saving.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (10)
1. The preparation method of the high-viscosity high-elasticity modified emulsified asphalt is characterized by comprising the following steps:
s1, heating 83-93.5 parts by weight of matrix asphalt to 170-190 ℃, adding 3-8 parts by weight of SBS, 1-3 parts by weight of aromatic oil, 0.5-2 parts by weight of tackifier c9 and 0.5-2 parts by weight of tackifier terpene, continuously heating to 180-190 ℃ and keeping for 8-15min, then carrying out colloid mill shearing, introducing into a reaction tank after shearing, keeping the temperature for 3-7h at 170-190 ℃, adding 0.05-0.15 part by weight of sulfide during the heat preservation period and stirring with 300-500r/min to prepare SBS modified asphalt;
s2, adding water to dissolve 4-9 parts by weight of cationic emulsifier, 0.1-0.2 part by weight of calcium chloride and 0.1-0.2 part by weight of polyvinyl alcohol, adjusting the pH value to 1.8-2.5, heating to 50-80 ℃, and uniformly stirring to obtain an emulsifier aqueous solution;
s3, shearing and emulsifying 60-70 parts by weight of SBS modified asphalt and 40-30 parts by weight of emulsifier aqueous solution together, and then introducing into a storage tank;
and S4, continuously adding 2.5 parts by weight of SBR (styrene butadiene rubber) latex into the storage tank in the S3, and uniformly stirring to obtain the high-viscosity high-elasticity modified emulsified asphalt.
2. The method for producing a high-viscosity high-elasticity modified emulsified asphalt as claimed in claim 1, wherein S3 and S4 are replaced with:
and S3, shearing and emulsifying 60-70 parts by weight of SBS modified asphalt, 40-30 parts by weight of emulsifier aqueous solution and 5-6.5 parts by weight of SBR latex together, and then introducing into a storage tank to obtain the high-viscosity high-elasticity modified emulsified asphalt.
3. The process for producing the high-viscosity, high-elasticity and modified emulsified asphalt as claimed in claim 1 or 2, wherein the colloid shearing in S1 and the shearing and emulsification in S3 are carried out by a colloid mill, wherein the rotation speed of the colloid mill in S1 is 5000 to 8000r/min and the rotation speed of the colloid mill in S3 is 3800 to 5500r/min.
4. The process for producing high viscous and high elastic modified emulsified asphalt as claimed in claim 1 or 2, wherein the sulfide comprises one or both of sulfur, tetramethylthiuram monosulfide and dipentamethylenethiuram tetrasulfide.
5. The method for producing a high-viscosity, high-elasticity modified emulsified asphalt as claimed in claim 1 or 2, wherein the cationic emulsifier comprises one of a slow-breaking emulsifier and a fast-breaking emulsifier.
6. The method for producing high-viscosity high-elasticity modified emulsified asphalt as claimed in claim 1 or 2, wherein the base asphalt comprises No. 70 road petroleum asphalt.
7. A high-viscosity high-elasticity modified emulsified asphalt obtained by the production method as claimed in any one of claims 1 to 6.
8. A construction method of a cold-mix ultrathin overlay, characterized in that the high-viscosity high-elasticity modified emulsified asphalt as claimed in claim 7 is used.
9. The construction method of the cold-mix ultrathin overlay as claimed in claim 8, characterized in that the road pavement is carried out after the high-viscosity high-elasticity modified emulsified asphalt is mixed with the aggregate; before paving, spreading a layer of high-viscosity emulsified asphalt adhesive layer on the road surface, wherein the spreading amount is 0.3-0.4kg per square meter.
10. The method of constructing a cold-mix ultra-thin overlay as claimed in claim 8 or 9, wherein the thickness of the overlay is 1.5-2.5 times the maximum particle size of the aggregate.
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| CN115785814A (en) * | 2022-11-29 | 2023-03-14 | 北京中铁科新材料技术有限公司 | Base layer treating agent for concrete pavement or bridge deck waterproof system |
| CN116462483A (en) * | 2023-05-11 | 2023-07-21 | 广东省强大沥青有限公司 | Cold high-performance modified asphalt liquid and preparation method thereof |
| CN117003512A (en) * | 2023-08-17 | 2023-11-07 | 广州方华交通技术有限公司 | Super-tough asphalt concrete for paving ultrathin overlay and preparation method thereof |
| CN117106314A (en) * | 2023-10-20 | 2023-11-24 | 广东路面博士交通科技有限公司 | Block copolymer-nano composite modified emulsified asphalt and preparation method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115785814A (en) * | 2022-11-29 | 2023-03-14 | 北京中铁科新材料技术有限公司 | Base layer treating agent for concrete pavement or bridge deck waterproof system |
| CN115785814B (en) * | 2022-11-29 | 2024-02-09 | 北京中铁科新材料技术有限公司 | Base layer treating agent for concrete pavement or bridge deck waterproof system |
| CN116462483A (en) * | 2023-05-11 | 2023-07-21 | 广东省强大沥青有限公司 | Cold high-performance modified asphalt liquid and preparation method thereof |
| CN117003512A (en) * | 2023-08-17 | 2023-11-07 | 广州方华交通技术有限公司 | Super-tough asphalt concrete for paving ultrathin overlay and preparation method thereof |
| CN117106314A (en) * | 2023-10-20 | 2023-11-24 | 广东路面博士交通科技有限公司 | Block copolymer-nano composite modified emulsified asphalt and preparation method thereof |
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