Recycled concrete with excellent crack resistance and preparation method thereof

Abstract

The invention relates to the field of recycled materials, and particularly discloses recycled concrete with excellent crack resistance and a preparation method thereof. The recycled concrete with excellent crack resistance is prepared from the following raw materials in parts by weight: cement, modified recycled aggregate, natural aggregate, fly ash, silica fume, a filler, composite fibers, an additive and water, the modified regenerated aggregate is prepared by sequentially modifying regenerated aggregate with a sodium lauroyl sarcosinate solution and a lecithin solution; the preparation method comprises the following steps: uniformly mixing and stirring the cement, the modified regenerated aggregate and the natural aggregate, then adding the fly ash and the silica fume, and continuously and uniformly stirring to prepare a primary mixture; adding the filler and the composite fiber into the primary mixture, uniformly mixing and stirring, then adding the additive and the water, and uniformly mixing and stirring to obtain a mixed material; and pouring, curing and demolding the mixed material to obtain the finished product concrete. The effect of excellent crack resistance is achieved.

Description

technical field [0001] The present application relates to the field of recycled materials, more particularly, to a recycled concrete with excellent crack resistance and a preparation method thereof. Background technique [0002] Recycled concrete refers to the new concrete prepared by crushing, cleaning and grading waste concrete blocks, mixing them with grading in a certain proportion, replacing part or all of natural aggregates such as sand and gravel, and then adding cement and water. [0003] Due to the large external force in the crushing process of waste concrete blocks, it is easy to cause many micro-cracks on the surface of the sand-stone blocks. The formation of micro-cracks not only affects the strength of the sand-gravel material itself, but also increases the water absorption rate of the sand-gravel material; When the water absorption rate increases, the amount of free water in mixing decreases, which makes the internal structure of the concrete looser and the ha...

AI Technical Summary

Problems solved by technology

[0003] Due to the large external force in the crushing process of waste concrete blocks, it is easy to cause many micro-cracks on the surface of the sand and gravel. The formation of micro-cracks not only affects the strength of the sand and gravel itself, but also increases the water absorption of the sand and gravel; As the water absorption rate increases, the amount of free water in mixing decreases, making the internal structure of the concrete looser and less hard, which leads to poor crack resistance of recycled concrete.

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