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Interface finishing agent improving rubber-cement stone substrate in rubber concrete

A technology of rubber concrete and interface treatment agent, which is applied in the field of concrete admixture, can solve the problems of human body harmful concrete destructive alkali aggregate reaction, rubber concrete strength not obviously improved, toxicity and volatility, etc., to improve interface bond strength and concrete The effect of overall compressive strength, easy engineering application and low price

Inactive Publication Date: 2009-08-12
BEIJING UNIV OF TECH
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Problems solved by technology

For example, the strength of rubber concrete washed with clear water does not increase significantly; Na(OH) solution is highly corrosive, harmful to the human body and will cause destructive alkali-aggregate reaction of concrete; carbon tetrachloride solution is also toxic and strong Volatile and expensive

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  • Interface finishing agent improving rubber-cement stone substrate in rubber concrete

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Embodiment Construction

[0009] The formula (weight ratio, unit kg) of the composite interface agent is: styrene-acrylic acid ester-silicone coupling agent copolymer accounts for 40-70%, ethylene-vinyl acetate copolymer accounts for 20-40%, PVA coupling agent Agent 10-20%, the three materials are mixed evenly in proportion. The amount of interface agent is 1-2% of the amount of rubber particles. First, dissolve the interface agent in warm water at 40-90°C, fully disperse and stir evenly, then stir the rubber particles and interface agent aqueous solution evenly, and finally place it in a dry ambient until the surface of the rubber particles is completely dry. The rubber particles treated with the interface agent are directly added to the cement concrete for use.

[0010] The basic mixing ratio of rubber aggregate concrete is: cement 450kg / m 3 , water 167kg / m 3 , sand 597kg / m 3 , rubber aggregate 70kg / m 3 , stone 1021kg / m 3 , Naphthalene series superplasticizer 4.5kg / m 3 . The cement is ordinar...

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Abstract

An interface finishing agent for improving a rubber-cement paste matrix in rubberized concrete belongs to the concrete additive technical field. At present, interface finishing agents for improving the rubber particle-cement paste matrix mainly includes washing treatment, Na (OH) solution and carbon tetrachloride solution washing treatment, etc. However, the application effects of the materials are not ideal. The invention is characterized in that the invention is made from evenly mixed three materials of styrene-acrylate-silicone coupling agent copolymer, ethylene-vinyl acetate copolymer, (PVA) polyvinyl alcohol coupling agent. The weight percentage of the components is 40-70 percent of the styrene-acrylate-silicone coupling agent copolymer, 20-40 percent of the ethylene-vinyl acetate copolymer and 10-20 percent of the PVA coupling agent. Compared with crumb rubber concrete, the surface of which is not treated, the interface agent of the invention can effectively improve the interface adhesion strength between the rubber particles and the cement paste matrix and further improve the compressive strength of the crumb rubber concrete by 6 percent above, which has no harmful effects on the workability of the concrete.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures. The interface treatment agent can significantly improve the interface bonding strength between rubber particles and cement stone matrix in the rubber aggregate concrete, thereby improving the strength and durability of the concrete without affecting the workability of the concrete. Background technique [0002] Concrete is currently the most widely used building material, but the inherent high brittleness and easy cracking of concrete seriously affect the durability of concrete structures. The commonly used methods to reduce the brittleness of concrete include fiber reinforcement and polymer modification, but the application of the two will significantly increase the price of concrete, and the fibers and polymers themselves are produced by consuming a lot of resources. Waste rubber is a kind of solid industrial waste. With the development of the rubber industry and the automobile ind...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/28
CPCC04B2103/0045C04B40/0039C04B2103/0091C04B28/02Y02W30/91C04B24/2623C04B24/42C04B14/04C04B18/22
Inventor 李悦王敏金彩云吴玉生韩兆兴
Owner BEIJING UNIV OF TECH
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