Low-shrinkage anti-cracking concrete

Abstract

The invention discloses low-shrinkage anti-cracking concrete, and belongs to the technical field of building materials, the low-shrinkage anti-cracking concrete is characterized in that the concrete comprises, by weight, 580-610 parts of a cementing material, 780-880 parts of machine-made sand, 900-940 parts of gravel, 25-35 parts of an additive and 130-160 parts of water, the cementing material comprises cement, fly ash, mineral powder and slag, and according to the weight ratio, the cementing material comprises the cement, the fly ash, the mineral powder and the slag. The ratio of the cement to the fly ash to the mineral powder to the slag is 5: (1.6-2.1): (1.2-1.7): (0.9-1.3), so that the effect of reducing the shrinkage rate of the concrete is achieved.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a low-shrinkage and anti-cracking concrete. Background technique [0002] The shrinkage and cracking of concrete has become a common problem in the modern concrete industry, seriously affecting the normal use and service life of construction engineering structures. [0003] The main reason for the shrinkage and cracking of concrete is that the evaporation rate of water inside and outside the concrete is different during the hardening process. Larger surface drying shrinkage deformation is restrained by the concrete interior, resulting in larger tensile stress, which leads to the generation of cracks. At present, the most common measures to solve the problem of shrinkage and cracking of concrete are to add superabsorbent resin to concrete, or to sprinkle water or spray on the concrete surface during concrete curing; although adding superabsorbent resin can solve the problem of c...

AI Technical Summary

Problems solved by technology

At present, the most common measures to solve the problem of shrinkage and cracking of concrete are to add superabsorbent resin to concrete, or to sprinkle water or spray on the concrete surface during concrete curing; although adding superabsorbent resin can solve the problem of concrete shrinkage and cracking, water-absorbent resin After the water is released, it will leave a void inside the concrete, which will affect the mechanical properties of the concrete; while sprinkling and spraying only temporarily moisten the concrete surface, but the water is not easy to enter the interior of the concrete, and the expected curing effect cannot be achieved.

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