Method for preparing recycled aggregate concrete from steel fiber rubber and slag

Abstract

The invention discloses a method for preparing recycled aggregate concrete from steel fiber rubber and slag. The method comprises the following steps: waste concrete is crushed, separated, screened, washed and dried to obtain waste concrete recycled aggregate; waste tires are coarsely crushed, separated, washed and dried to obtain steel fiber rubber particles; the slag is crushed, screened, magnetically separated and classified by air to obtain slag powder; the waste concrete recycled aggregate, the steel fiber rubber particles, cement slag powder mixture, natural coarse aggregate, sands and water are stirred in proportion; the cracking resistance, thermal insulation performance and energy absorbing and noise reducing performance of the recycled aggregate concrete can be effectively improved by modifying the steel fiber rubber particles; the working performance of green concrete and contraction performance of the concrete in each curing time can be improved by modifying the slag powder; and the infiltration resistance and carbonization resistance can be effectively improved and chloride ion diffusion velocity of the concrete can be effectively reduced. The material is a cycled economical building material, and can improve the material performance on the basis of not increasing cost.

Description

technical field [0001] The invention belongs to construction engineering materials, in particular to a preparation method of recycled aggregate concrete modified by steel fiber rubber particles and steel slag powder. Background technique [0002] The development and application of recycled concrete can use a large amount of waste concrete, which can be used as recycled aggregate to replace natural aggregate after treatment, thereby reducing the consumption of natural aggregate in the construction industry; the development and application of recycled concrete has also fundamentally solved the problem of The increasing shortage of natural aggregates and the deterioration of the ecological environment caused by a large amount of concrete waste ensure the sustainable development of human society. However, waste concrete aggregate has lower density, higher water absorption and lower strength than ordinary aggregate. Because there are more cement mortars attached to the surface o...

AI Technical Summary

Problems solved by technology

[0003] With the development of the national economy, waste rubber products are increasing day by day. According to statistics, my country currently consumes more than 20,000 tons of rubber per year, and the recycling rate is less than 30%.

Waste rubber is not easy to degrade, and it will pollute the environment after landfilling. Incineration will also bring air pollution. How to deal with the increasing waste rubber has become a serious environmental problem.

If waste rubber can not be used rationally, it will also cause a waste of effective energy.

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