Anti-cracking concrete and production process thereof

Abstract

The invention discloses anti-cracking concrete, which is prepared by mixing the following components in parts by weight: 240-315 parts of cement, 635-705 parts of gravels, 410-515 parts of modified recycled aggregate, 715-835 parts of sand, 140-185 parts of water, 5-9 parts of a water reducing agent, 80-125 parts of fly ash, 18-25 parts of borax and 25-35 parts of modified combined fibers, whereinthe preparation method of the modified recycled aggregate comprises the following steps: mixing 65-75 parts by weight of water glass with a mass concentration of 5%, 12-18 parts by weight of an organic silicon resin and 4-8 parts by weight of borax to obtain an aggregate modification solution, soaking recycled aggregate into the aggregate modification solution for 30-40 minutes, taking out, and draining to obtain the modified recycled aggregate, and the preparation method of the modified combined fibers comprises the following steps: mixing 15-27 parts by weight of polyvinyl alcohol and 35-50parts by weight of water, carrying out heating melting, adding 2.4-3.2 parts by weight of polyethylene glycol, stirring to obtain a fiber modified solution, uniformly mixing polypropylene fibers andcarbon fibers according to a weight part ratio of (4-5):1, immersing into the fiber modified solution for 1-2 hours, taking out, and draining to obtain modified combined fibers. According to the invention, the anti-cracking concrete has characteristics of improved impact resistance, improved splitting strength and cracking reducing.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to an anti-cracking concrete and a production process thereof. Background technique [0002] Among the raw materials of concrete, aggregate accounts for the largest proportion. Traditional aggregates are made of natural sand and stone. During the mining process, it is easy to cause damage to mountains, vegetation, and rivers. For this reason, recycled aggregates have attracted attention. Recycled aggregates are particles obtained by crushing waste concrete, which can not only greatly reduce the use of natural sand and gravel, but also enable waste concrete to be reused. However, compared with natural sand and gravel, the surface of recycled aggregate is rough and the porosity is large. When it is applied to concrete, it will absorb a lot of water, which will easily lead to a decrease in the cohesion of concrete, resulting in poor impact resistance of concrete. The splitting streng...

AI Technical Summary

Problems solved by technology

However, compared with natural sand and gravel, the surface of recycled aggregate is rough and the porosity is large. When it is applied to concrete, it will absorb a lot of water, which will easily lead to a decrease in the cohesion of concrete, resulting in poor impact resistance of concrete. Lower splitting strength, which reduces the anti-cracking performance of concrete

[0003] At present, one of the measures to improve the anti-cracking performance of concrete is to add fibers, such as polypropylene fibers, to concrete. However, the bonding performance of polypropylene fibers with the concrete matrix is ​​not ideal, and usually requires modification.

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