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Modified aggregate as well as preparation method and application thereof

An aggregate and modification technology, applied in the field of modified aggregate and its preparation, can solve the problems of reduced strength and fatigue resistance of the mixture, easy segregation, poor thermal stability, etc., and achieves the effect of good water stability

Inactive Publication Date: 2021-02-05
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of alkaline aggregates will improve the water stability of asphalt mixture, but the strength and fatigue resistance of the mixture will be reduced, because the mechanical properties of alkaline aggregates include compressive strength, wear resistance, etc. good material
However, the current use of anti-stripping agents cannot fundamentally prevent the occurrence of water damage, because the bonding strength between asphalt and aggregates is still not as strong as hydrogen bonds after adding anti-stripping agents. When water enters asphalt concrete, it will form hydrogen bonds with aggregates. Aggregate binding, allowing the asphalt film to peel off the aggregate surface
And there are other deficiencies in the anti-stripping agent, such as easy segregation, poor thermal stability and insufficient durability, etc.

Method used

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  • Modified aggregate as well as preparation method and application thereof
  • Modified aggregate as well as preparation method and application thereof
  • Modified aggregate as well as preparation method and application thereof

Examples

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preparation example Construction

[0020] This specific embodiment proposes a kind of preparation method of modified aggregate, comprising the following steps:

[0021] The ethoxysilane coupling agent aqueous solution is 2%-3% of the mass of the aggregate, and the ethoxysilane coupling agent aqueous solution is sprayed on the aggregate surface; wherein, the ethoxysilane coupling agent aqueous solution contains ethoxy The volume concentration of the silane coupling agent is 0.1-1%, further, the volume concentration of the ethoxysilane coupling agent is preferably 0.5%; the aggregate includes one or more of crushed stones, pebbles and sand kind;

[0022] The modified aggregate is obtained by curing the aggregate sprayed with an ethoxysilane coupling agent at 150-180° C. for 2-3 hours. Treating the aggregate at this temperature can improve the curing efficiency of the ethoxysilane coupling agent on the aggregate.

[0023] This specific embodiment also includes a modified aggregate prepared by the above preparati...

Embodiment 1

[0034] A preparation method of modified aggregates, comprising the following steps:

[0035] (1) Spraying the aqueous solution of ethoxysilane coupling agent: prepare an aqueous solution of ethoxysilane coupling agent with a volume fraction of 0.5%, and put the solution into a watering can after standing at room temperature for 20 minutes. Then, according to the requirements of the test specification, weigh a certain mass of aggregate and pour it into an enamel plate, then evenly spray the solution on the surface of the aggregate with 2% of the mass of the aggregate, and stir evenly with a small shovel.

[0036] (2) Dry and cure the modified aggregates: turn on the oven, set the temperature to 170°C, then place the aggregates sprayed with ethoxysilane coupling agent in the oven, and dry and cure for 2 hours.

Embodiment 2

[0038] A preparation method of modified aggregates, comprising the following steps:

[0039] (1) Spraying the aqueous solution of ethoxysilane coupling agent: prepare an aqueous solution of ethoxysilane coupling agent with a volume fraction of 0.5%, and put the solution into a watering can after standing at room temperature for 20 minutes. Then, according to the requirements of the test specification, weigh a certain mass of aggregate and pour it into an enamel plate, then evenly spray the solution on the surface of the aggregate with 3% of the mass of the aggregate, and stir evenly with a small shovel.

[0040] (2) Drying and curing the modified aggregate: turn on the oven, set the temperature to 150°C, then place the aggregate sprayed with ethoxysilane coupling agent in the oven, and dry and cure for 3 hours.

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Abstract

The invention relates to a modified aggregate as well as a preparation method and an application thereof. The method comprises the following steps: spraying an ethoxysilane coupling agent aqueous solution on the surface of the aggregate; and curing the aggregate sprayed with the ethoxysilane coupling agent at the temperature of 150-180 DEG C to obtain the modified aggregate. The invention also comprises the modified aggregate prepared by the preparation method. In addition, the invention also provides an application of the modified aggregate in preparation of an asphalt mixture. The modified aggregate can be firmly and stably adhered to asphalt and has good water stability.

Description

technical field [0001] The invention relates to the technical field of road engineering, in particular to a modified aggregate and its preparation method and application. Background technique [0002] Water damage is one of the more common pavement diseases on asphalt concrete pavement. The most important way to solve the problem of water damage is to improve the adhesion between aggregate and asphalt. There are two main methods: use alkaline aggregates with good adhesion to asphalt materials; adding anti-stripping agents to concrete. Currently commonly used anti-stripping agents include: using hydrated lime to modify the asphalt and aggregates to form better adhesion under alkaline conditions; using amino-based polymers to enhance the polarity of asphalt and enhance the surface adhesion between asphalt and aggregates. [0003] The above two methods can improve the adhesion between asphalt and aggregate to a certain extent, but both have shortcomings. The use of alkaline a...

Claims

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Application Information

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IPC IPC(8): C04B20/10C04B26/26
CPCC04B20/1051C04B20/1088C04B26/26
Inventor 罗蓉汪翔涂崇志黄婷婷罗晶牛茏昌苗强
Owner WUHAN UNIV OF TECH
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