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Core-shell type asphalt self-repairing agent and preparation method thereof

A core-shell type, self-repairing technology, applied to building components, building insulation materials, buildings, etc., can solve problems such as low-temperature cracking, shortened service life of asphalt pavement, hard and brittle asphalt pavement, etc. High coverage and high mechanical strength

Active Publication Date: 2016-11-16
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Road asphalt is aged under the action of ultraviolet light, heat, oxygen, etc., which will cause the asphalt pavement to become hard and brittle, cause water damage and low temperature cracking, and greatly shorten the service life of the asphalt pavement. How to repair and restore the micro cracks on the asphalt pavement Aged asphalt is an important problem that has always been concerned in the field of road engineering and needs to be solved urgently
In order to solve the above problems, the asphalt rejuvenator is usually sprayed or brushed on the surface of the asphalt pavement to make it react with the aged asphalt, so that the penetration, softening point and ductility of the asphalt are restored, but this method not only seriously affects the road traffic Traffic capacity, and there are defects such as difficulty in choosing the timing of regenerant spraying, inability to accurately control the penetration depth, and difficulty in penetrating into cracks

Method used

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  • Core-shell type asphalt self-repairing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 15g of sodium alginate and add it to 250ml of distilled water to prepare a 6% sodium alginate solution;

[0023] Weigh 0.3g of polyethylene maleic anhydride copolymer (PEMA), dissolve it in water at 70°C according to the mass fraction of 2.5%, and stir at a low speed for 1 hour;

[0024] Add 15g of LKJ type asphalt rejuvenator into the PEMA solution, keep the stirring rate at 300 rpm and stir for 5 minutes;

[0025] Use a high-speed shear to mix the PEMA-asphalt repair agent solution and sodium alginate solution in a three-necked bottle, the shear rate is 2000 rpm, and the shear time is 2.5 minutes;

[0026] The above solution was added dropwise into 500ml of 2% calcium chloride solution, and polymerized at 80°C for 2 hours under stirring. The obtained core-shell type asphalt regenerant is washed and dried with distilled water;

[0027] The average particle size of the core-shell type asphalt rejuvenator prepared by the method is 3 mm, and the fracture rate afte...

Embodiment 2

[0031] Weigh 10g of sodium alginate and add it to 250ml of distilled water to prepare a 4% sodium alginate solution;

[0032] Weigh 0.45g of polyethylene maleic anhydride copolymer (PEMA), dissolve it in water at 70°C by mass fraction 2%, and keep it warm for 1 hour;

[0033] Add 15g of ERA-C type asphalt rejuvenator into the PEMA solution, keep the stirring rate at 300 rpm and stir for 5 minutes;

[0034] Use a high-speed shearing machine to mix the PEMA-asphalt repair agent solution and sodium alginate solution in a three-necked bottle, the shear rate is 3000 rpm, and the shear time is 5 minutes;

[0035] While stirring, gradually add the asphalt regenerant into the three-necked flask, keep the stirring rate at 500 rpm and continue stirring for 20 minutes;

[0036] The above solution was added dropwise into 500ml of 3% calcium chloride solution, and polymerized at 80°C for 2 hours while stirring. The obtained core-shell type asphalt regenerant is washed and dried with dist...

Embodiment 3

[0039] Weigh 17.5g of sodium alginate and add it to 250ml of distilled water to prepare a 7% sodium alginate solution;

[0040] Weigh 0.3g of polyethylene maleic anhydride copolymer (PEMA), dissolve it in water at 70°C according to 3% by mass fraction, stir at low speed and keep warm for 1 hour;

[0041] Add 17.5g of asphalt regeneration type asphalt rejuvenator into the PEMA solution, and keep stirring at a stirring rate of 300 rpm for 8 minutes;

[0042] Use a high-speed shearing machine to mix the PEMA-asphalt repair agent solution and sodium alginate solution in a three-necked bottle, the shear rate is 2500 rpm, and the shear time is 4 minutes;

[0043] The above solution was added dropwise into 500 ml of 2.5% calcium chloride solution, and polymerized at 80° C. for 2 hours while stirring. The obtained core-shell type asphalt regenerant is washed and dried with distilled water;

[0044] The average particle size of the core-shell type asphalt rejuvenator prepared by the ...

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Abstract

The invention discloses a core-shell type asphalt self-repairing agent and a preparation method thereof, wherein calcium alginate is adopted as a wall material, an asphalt regeneration agent is adopted as a core material, a mass ratio of the wall material to the core material is 1:1-1:1.5, and the particle size of the shell is 1-3 mm. The preparation method comprises: 1) adding an asphalt regeneration agent to a polyethylene maleic anhydride copolymer aqueous solution, and carrying out stirring mixing; 2) carrying out shear mixing on the liquid obtained in the step 1) and a calcium alginate solution by using a high-speed shearing machine, wherein the shearing rate is 2000-3000 rpm, and the shearing time is 3-5 min; 3) slowly adding the liquid obtained in the step 2) into a calcium chloride solution, carrying out a stirring for 1.5-2.5 h at a temperature of 75-85 DEG C, washing with distilled water, and drying to obtain the core-shell type asphalt regeneration agent. According to the present invention, the shell calcium alginate has characteristics of good thermal stability and high mechanical strength, and has the breaking rate of less than 10% during the stirring of the asphalt mixture, the coverage rate of the asphalt regeneration agent is high, and the sufficient regeneration agent can be provided for the asphalt self-repair.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a core-shell type asphalt self-repairing agent and a preparation method thereof. Background technique [0002] Road asphalt is aged under the action of ultraviolet light, heat, oxygen, etc., which will cause the asphalt pavement to become hard and brittle, cause water damage and low temperature cracking, and greatly shorten the service life of the asphalt pavement. How to repair and restore the micro cracks on the asphalt pavement Aged asphalt has always been an important problem that has been concerned about in the field of road engineering and needs to be solved urgently. In order to solve the above problems, the asphalt rejuvenator is usually sprayed or brushed on the surface of the asphalt pavement to make it react with the aged asphalt, so that the penetration, softening point and ductility of the asphalt are restored, but this method not only seriously affects ...

Claims

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Application Information

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IPC IPC(8): C08L5/04C08L91/00C08L23/08C08L95/00
CPCC08L5/04C08L91/00C08L95/00C08L2205/03C08L2205/035C08L23/0869
Inventor 刘全涛余万吴少鹏孙艺涵李斌方昊饶银秋
Owner WUHAN UNIV OF TECH
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