Recycled concrete replaced by brick-concrete recycled coarse aggregate and preparation method of recycled concrete

Abstract

The invention relates to recycled concrete replaced by brick-concrete recycled coarse aggregate. The recycled concrete comprises cement, fly ash, mineral powder, fine aggregate, coarse aggregate, a water reducing agent and water, the coarse aggregate comprises natural coarse aggregate and brick-mixed recycled coarse aggregate, and the mass percentage of the brick-mixed recycled coarse aggregate in the coarse aggregate is 20%-30%; the brick-mixed recycled coarse aggregate is obtained by compounding recycled red brick coarse aggregate and recycled concrete coarse aggregate, and the mass percent of the recycled red brick coarse aggregate is 50%-75%. The brick-concrete recycled coarse aggregate is used for partially replacing natural coarse aggregate in the concrete, and the prepared recycled concrete has better cubic compressive strength and axial compressive strength and also has better elastic modulus, Poisson's ratio and frost resistance; the current situation of shortage of natural aggregate supply at present is relieved, and resource application of the building waste is achieved.

Description

technical field [0001] The invention relates to recycled concrete replaced by brick-mixed recycled coarse aggregate and a preparation method thereof, belonging to the technical field of concrete. Background technique [0002] As the most commonly used material, concrete is widely used in various modern buildings and structures. With the shortage of concrete raw materials and the problems faced by construction waste reduction and resource application, research on recycled concrete is also increasing. Applied research can not only reduce the use and mining of raw materials, relieve environmental pressure, but also realize the resource application of construction waste, so the research on recycled concrete is very meaningful. [0003] At present, most of the research on recycled concrete uses recycled concrete aggregates. In reality, recycled aggregates often contain a large amount of red bricks. The performance of brick-concrete aggregates is quite different from that of pure ...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the research on recycled concrete uses recycled concrete aggregates. In reality, recycled aggregates often contain a large amount of red bricks. The performance of brick-concrete aggregates is quite different from that of pure recycled concrete aggregates, and there are few related studies. It is also difficult to apply to the preparation of recycled concrete

Moreover, the separation technology of brick-concrete aggregate is still not perfect, and the labor cost of realizing brick-concrete separation is high, it is difficult to separate on a large scale, and there is a large difference in the content of red brick in the brick-concrete aggregate, and the performance of the aggregate itself is highly discrete

Brick-concrete recycled aggregates are mostly used for roads as the base layer or made into recycled products, and the resource utilization of brick-concrete aggregates in cement concrete is difficult

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