Recycled concrete and preparation method thereof

Abstract

The invention relates to recycled concrete and a preparation method thereof, wherein the recycled concrete comprises, by weight, 60-70 parts of recycled coarse aggregate, 18-22 parts of natural coarseaggregate, 15-20 parts of slag Portland cement, 15-20 parts of fine sand, 10-15 parts of activated water, 8-12 parts of fly ash, 5-8 parts of modified polypropylene fiber, 4-6 parts of a binder, 3-5parts of silica powder, 3-5 parts of manganese dioxide powder, and 3-5 parts of a water reducing agent. The preparation method comprises: S1, breaking waste concrete to form recycled coarse aggregate;S2, screening the recycled coarse aggregate with a particle size of 10-15 mm so as to be spare; S3, cleaning the surface of the recycled coarse aggregate to remove the residual cement mortar on the surface; S4, mixing, wherein the raw materials are sequentially mixed, and uniform stirring is performed to obtain a recycled concrete slurry; and S5, pouring with the recycled concrete slurry, vibrating, and molding. According to the present invention, the recycled concrete has the improved strength.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a recycled concrete and a preparation method thereof. Background technique [0002] With the vigorous development of commercial concrete in our country, the concrete industry has become a pillar industry in the field of building materials. However, as the largest man-made engineering material, once a building or structure disintegrates, it will correspondingly become the "main force" of construction waste. At present, in my country, the annual discharge of concrete waste exceeds 100 million tons. Most of these waste concrete cannot be recycled well, and a large number of sites are needed to deal with these construction wastes. At the same time, as the pillar industry of the building materials industry, the cement industry is also a well-deserved "big player" in terms of resource and energy consumption, which is contrary to the current situation of resource shortage an...

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned existing technical solutions have the following defects: the recycled coarse aggregate needs to be crushed during the preparation process, and some micro-cracks will be generated inside the recycled coarse aggregate during the crushing process. In the process of preparing recycled concrete, the recycled concrete Surface dehydration will occur, and surface dehydration will aggravate the degree of cracking of micro-cracks, resulting in a decrease in the strength and performance of recycled concrete

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