Environment-friendly asphalt mixture and preparation method thereof

An asphalt mixture and an environment-friendly technology, applied in the field of environment-friendly asphalt mixture and its preparation, can solve the problems of low Marshall stability, high water absorption, weak aggregate bearing capacity, etc., and achieve the preparation process conditions that are easy to control and improve the resistance to The effect of cracking performance and strengthening connection strength

Inactive Publication Date: 2021-08-27
上海繁荣道路建设工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The recycled aggregate produced by the above preparation method mainly has the following disadvantages. The waste concrete block after crushing will have micro-cracks inside, resulting in weak aggregate bearing capacity, and the surface is relatively rough due to residual impurities adhered to it. At the same time, the high water absorption rate will increase the asphalt ratio of the mixture to a certain extent. Therefore, the Marshall stability of the asphalt mixture made by using the recycled aggregate is low. Phenomena such as oil, rutting, and bagging

Method used

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  • Environment-friendly asphalt mixture and preparation method thereof
  • Environment-friendly asphalt mixture and preparation method thereof

Examples

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preparation example 1

[0071] A modified recycled aggregate is prepared by the following steps:

[0072] a. First, heat the waste concrete blocks to 600°C, pass in high-pressure air, and after cooling to room temperature, put them into a ball mill for crushing and grinding, and sieve the crushed powder with a particle size of less than 10mm for later use;

[0073] b. Put the crushed powder prepared in a into a hot stirring tank with pickling solution, heat and stir at 200r / min at 60°C for 2 hours, then take it out and dry it for later use;

[0074] The pickling solution is composed of phosphoric acid, oxalic acid, and hydrochloric acid in a volume ratio of 1:0.5:0.2, and the pH of the pickling solution is 5.0;

[0075] c. Put the crushed powder after pickling in b into a hot stirring tank equipped with alkalization solution, feed nitrogen gas, stir for 4 hours at a speed of 200r / min, take it out and dry it for later use;

[0076] The alkaline solution is composed of water, ethanol, sodium hydroxide...

preparation example 2

[0081] a. First, heat the waste concrete blocks to 700°C, pass in high-pressure air, and after air cooling to room temperature, put them into a ball mill for crushing and grinding, and sieve the crushed powder with a particle size of less than 10mm for later use;

[0082] b. Put the crushed powder prepared in a into a hot stirring tank with pickling solution, heat and stir at 300r / min at a temperature of 70°C for 3 hours, then take it out and dry it for later use;

[0083] The pickling solution is composed of phosphoric acid, oxalic acid, and hydrochloric acid in a volume ratio of 1:0.5:0.2, and the pH of the pickling solution is 3.0;

[0084] c. Put the crushed powder after pickling in b into a hot stirring tank equipped with alkalization solution, feed nitrogen gas, stir for 6 hours at a speed of 300r / min, take it out and dry it for later use;

[0085] The alkaline solution is composed of water, ethanol, sodium hydroxide, sodium silicate, and calcium hydroxide in a weight ra...

preparation example 3

[0090] a. First, heat the waste concrete blocks to 800°C, pass in high-pressure air, and after cooling to room temperature, put them into a ball mill for crushing and grinding, and sieve the crushed powder with a particle size of less than 10mm for later use;

[0091] b. Put the pulverized powder prepared in a into a heated stirring tank with pickling solution, heat and stir at 400r / min at 80°C for 4 hours, then take it out and dry it for later use;

[0092] The pickling solution is composed of phosphoric acid, oxalic acid, and hydrochloric acid in a volume ratio of 1:0.5:0.2, and the pH of the pickling solution is 5.0;

[0093] c. Put the crushed powder after pickling in b into a hot stirring tank equipped with an alkalization solution, feed in nitrogen, stir at a speed of 400r / min for 8 hours, take it out and dry it for later use;

[0094] The alkaline solution is composed of water, ethanol, sodium hydroxide, sodium silicate, and calcium hydroxide in a weight ratio of 1:0.2:...

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Abstract

The invention relates to the technical field of preparation of asphalt mixtures, and particularly discloses an environment-friendly asphalt mixture and a preparation method thereof. The environment-friendly asphalt mixture is prepared from the following components in parts by weight: 2000 to 2500 parts of fine aggregate, 2000 to 2500 parts of coarse aggregate, 150 to 200 parts of mineral powder, 250 to 300 parts of asphalt, 50 to 80 parts of resin powder, 50 to 100 parts of an emulsifier, 0.6 to 1.2 parts of an anti-stripping agent, and 2000 to 2500 parts of modified recycled aggregate, wherein the modified recycled aggregate is prepared from waste concrete blocks through crushing, acid pickling, alkalization, modification, calcination and other procedures. According to the environment-friendly asphalt mixture disclosed by the invention, the waste concrete blocks are recycled, and multiple modification procedures are matched for treatment, so the environment-friendly asphalt mixture has the advantages of environmental protection, energy conservation, and high Marshall stability and immersion residue stability at the same time.

Description

technical field [0001] The application relates to the technical field of asphalt mixture preparation, more specifically, it relates to an environment-friendly asphalt mixture and a preparation method thereof. Background technique [0002] Environmentally friendly asphalt mixture refers to the reprocessing of construction solid waste or old materials, and then it is added to the asphalt mixture in a certain proportion, so that it can replace part of the natural coarse aggregate and become the main skeleton of the asphalt mixture. , the prepared mixture that meets the road performance requirements. By using construction waste such as waste concrete, after being crushed, as recycled aggregate, the development of the construction industry and building materials industry can be organically combined with the protection of the ecological environment and the control of environmental pollution. While obtaining economic benefits, it can also consume A lot of garbage, reducing polluti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B26/26C04B111/34
CPCC04B26/26C04B2201/50C04B2111/343C04B2111/0075C04B2111/00017
Inventor 张利娅蔡红梅陈燕王本财
Owner 上海繁荣道路建设工程有限公司
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