Fair-faced concrete and its preparation process

Abstract

The invention relates to fair-faced concrete and a preparation process thereof, belonging to the technical field of concrete. In parts by weight, clear-faced concrete contains 180-330 parts of cement, 110-160 parts of water, 960-1150 parts of modified recycled coarse aggregate, 480-630 parts of fine aggregate, 50-105 parts of fly ash, mineral powder 95-120 parts, 50-140 parts of glass powder, 30-60 parts of calcium oxide, 3-7 parts of water reducing agent, 2-5 parts of air-entraining agent; the preparation method of modified recycled coarse aggregate includes the following steps: S1: Take waste concrete, crush and sieve it to obtain recycled coarse aggregate; S2: soak the recycled coarse aggregate in a citric acid solution with a mass concentration of 4-6%, and then dry it; S3: Dilute 50-70 parts of polyethylene Alcohol, 20-60 parts of sodium silicate and 500-700 parts of water are stirred to obtain a modified solution, which is set aside; S4: soak the regenerated coarse aggregate obtained in S2 into the modified solution in S3, take it out and place it at 150- Bake at 180°C to obtain modified recycled coarse aggregate. The fair-faced concrete of the invention has better compressive strength effect.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a fair-faced concrete and a preparation process thereof. Background technique [0002] Fair-faced concrete is a kind of fair-faced concrete that directly uses the natural texture of fair-faced concrete as a finishing effect. It does not need to be sprayed and other surface treatments. It can not only show individuality, but also is conducive to environmental protection. The market share of fair-faced concrete is gradually expanding. [0003] In fair-faced concrete, the amount of aggregate ranks first, and it is the component with the largest volume specific gravity. The disorderly mining of natural sand and gravel resources brought about by the application of aggregates has caused damage to mountain vegetation and rivers. Therefore, the development and application of waste concrete construction waste as recycled coarse aggregate has attracted more and more attention. [0004] ...

AI Technical Summary

Problems solved by technology

[0004] However, since the waste concrete needs to be subjected to a large external force during the disintegration and crushing process, micro-cracks are prone to appear inside the aggregate, and the porous cement mortar will remain on the surface of the recycled aggregate, which increases the porosity of the recycled aggregate. , which in turn increases the water absorption rate and water absorption rate of recycled aggregates

Therefore, the compressive strength of fair-faced concrete made of recycled aggregates is easily affected, and even affects the service life of fair-faced concrete

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