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

A technology of rubber concrete and interface treatment agent, applied in the field of concrete admixtures, can solve the problems of harmful alkali-aggregate reaction of concrete, insignificant increase in strength of rubber concrete, toxicity and volatility, etc., so as to improve the interface bonding strength and concrete. Overall compressive strength, easy engineering application, low price effect

Inactive Publication Date: 2008-05-21
BEIJING UNIV OF TECH
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AI Technical Summary

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

Method used

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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

The invention relates to an interface treatment agent for improving the rubber-cement matrix in rubber concrete, which belongs to the technical field of concrete admixtures. At present, the interface treatment agents for improving the rubber particle-cement stone matrix mainly include: water washing, Na(OH) solution corrosion and carbon tetrachloride solution cleaning treatment, etc. But above-mentioned material use effect is unsatisfactory. The present invention is characterized in that it is prepared by uniformly mixing three materials: styrene-acrylic acid ester-silicon coupling agent copolymer, ethylene-vinyl acetate copolymer, and polyvinyl alcohol coupling agent (PVA). The weight percentages of each component are: styrene-acrylate-organic silicon coupling agent copolymer accounts for 40-70%, ethylene-vinyl acetate copolymer accounts for 20-40%, and PVA coupling agent accounts for 10-20%. . Compared with the rubber aggregate concrete without surface treatment, the interface agent of the present invention can effectively improve the interface bonding strength between the rubber particles and the cement stone matrix, thereby increasing the compressive strength of the rubber aggregate concrete by more than 6%. The workability of the concrete was not adversely affected.

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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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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