Super-slump-loss-resistant concrete containing machine-made sand and preparation method of super-slump-loss-resistant concrete

Abstract

The invention relates to the field of building materials, and particularly discloses super-slump-loss-resistant concrete containing machine-made sand and a preparation method of the super-slump-loss-resistant concrete. The super-slump-loss-resistant concrete containing the machine-made sand is prepared from the following components: cement, fly ash, mineral powder, the machine-made sand, broken stone, sodium pyrosulfite, a methyl allyl polyoxyethylene ether water reducing agent, hydroxyethyl methyl cellulose and dimethyl hydroxyl silicone oil. The preparation method comprises the following steps: uniformly mixing the sodium pyrosulfite, the methylallyl polyoxyethylene ether water reducing agent, the hydroxyethyl methyl cellulose and the dimethyl hydroxyl silicone oil, and then adding the mixture into the cement, the fly ash, the mineral powder, the machine-made sand and the gravel which are kept to be stirred. The super-slump-loss-resistant concrete containing the machine-made sand has the advantage that the slump retaining time is prolonged.

Description

technical field [0001] The application relates to the field of concrete, more specifically, it relates to a super-slump concrete containing machine-made sand and a preparation method thereof. Background technique [0002] As one of the basic building materials, concrete has the characteristics of high strength and low cost. The basic materials of concrete are glue, sand, stone and water. Construction waste and mine tailings can be crushed into machine-made sand for concrete production. Improve resource utilization and reduce environmental pollution. [0003] The surface of machine-made sand particles is rough and has more edges and corners, so the workability of machine-made sand concrete is not as good as that of natural sand concrete, so the cement slurry of machine-made sand concrete has poor water-holding ability. The main component of machine-made sand is calcium carbonate. On the one hand, it can promote the hydration of cement and increase the strength of concrete. O...

AI Technical Summary

Problems solved by technology

[0003] The surface of machine-made sand particles is rough and has more edges and corners, so the workability of machine-made sand concrete is not as good as that of natural sand concrete, so the cement slurry of machine-made sand concrete has poor water-holding ability

The main component of machine-made sand is calcium carbonate. On the one hand, it can promote the hydration of cement and increase the strength of concrete. On the other hand, it will increase the adsorption of water and water reducing agent, resulting in a large loss of machine-made sand concrete over time.

[0004] Therefore, the existing machine-made sand concrete has poor slump protection effect, and the construction and use time of machine-made sand concrete is relatively short, and there is still room for optimization in prolonging the slump protection time