A recycled concrete produced from recycled aggregate

Abstract

The invention discloses recycled concrete prepared from recycled aggregate. The recycled concrete comprises raw materials in percentage by mass as follows: 37%-55% of recycled coarse aggregate, 17%-37% of recycled fine aggregate, 15%-22% of P.O.42.5 cement and 8%-12% of water, wherein the particle size of the recycled coarse aggregate is 5-31.5 mm, and the particle size of the recycled fine aggregate is smaller than 5 mm; the recycled coarse aggregate comprises 35%-40% of recycled coarse aggregate with the particle size of 5-20 mm and 60%-65% of recycled coarse aggregate with the particle size of 20-31.5 mm. According to the recycled concrete, natural aggregate is completely replaced with the recycled aggregate, and the recycled concrete is novel recycled concrete different from natural aggregate concrete. The performance of the recycled concrete can basically meet the use requirements of civil construction, demands for the natural aggregate are relieved to a great extent, and the recycled concrete needs no addition of an admixture or additive, adopts a simple formula, is low in cost and has broad application value.

Description

technical field [0001] The invention relates to recycled concrete produced by using recycled aggregates, and belongs to the technical field of construction waste recycling. Background technique [0002] With the development of my country's urbanization process, the discharge of construction waste is increasing year by year, and the proportion of renewable components in construction waste is also increasing. However, most of the construction waste is transported to the suburbs or around the city for simple landfill or open storage without any treatment, which not only wastes land and resources, but also pollutes the environment; on the other hand, with the increasing population, The demand for sand and gravel aggregates in the construction industry continues to grow. For a long time, because sand and gravel aggregates are widely available and cheap, they are considered inexhaustible raw materials and have been exploited at will, resulting in resource depletion, landslides, r...

AI Technical Summary

Problems solved by technology

[0003] At present, although there are some researches on recycled aggregate concrete, there are still the following problems: (1) In recycled concrete mainly composed of natural aggregates, the proportion of recycled aggregates is low, and recycled aggregates cannot be fully utilized; (2) Recycled aggregates are used instead of natural aggregates, but because there is no research on the performance of recycled aggregates, the use of recycled aggregates is unscientific, and it is still necessary to add admixtures and additives to improve the performance of recycled concrete

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