Method for greatly improving impermeability of washed sand concrete through powder-liquid double doping

Abstract

The invention discloses a method for greatly improving the impermeability of washed sand concrete through powder-liquid double doping, and the method for greatly improving the impermeability of the washed sand concrete through powder-liquid double doping comprises the following steps: adding a solid expanding agent and a liquid compacting agent in the stirring process of the concrete; the concrete is prepared from the following components in parts by weight: 200 to 400 parts of cement, 15 to 50 parts of mineral powder, 20 to 60 parts of fly ash, 500 to 800 parts of artificial sand, 150 to 250 parts of river sand, 800 to 1200 parts of pebbles, 5 to 20 parts of a water reducing agent, 100 to 200 parts of water, 20 to 50 parts of an expanding agent and 0.5 to 2 parts of a compacting agent. According to the method, both the expanding agent and the compacting agent can effectively improve the impermeability of the washed sand concrete, and the expanding agent and the compacting agent are simultaneously added into the concrete to play a synergistic role so that the impermeability of the concrete is greatly improved, which has great practical significance for a concrete structure with special requirements.

Description

technical field [0001] The invention relates to the technical field of concrete engineering, in particular to a method for greatly improving the impermeability of water-washed sand concrete by double mixing powder and liquid. Background technique [0002] Water tight concrete is a kind of concrete with high impermeability and waterproof requirements. [0003] The mix ratio design of traditional waterproof concrete basically uses single-mixing expansion agent, admixture, steel fiber, synthetic fiber, etc. to improve the waterproof level. Although it can meet the design requirements, the engineering practice largely depends on the pouring and maintenance of the construction site. Especially according to the standard requirements, waterproof concrete needs to be cured for no less than 14 days, especially for water-washed sand concrete. Compared with river sand, the water-washed artificial sand particles are poorly assembled, relatively thick, and the edges and corners of the pa...

AI Technical Summary

Problems solved by technology

[0003] The mix ratio design of traditional waterproof concrete basically uses single-mixing expansion agent, admixture, steel fiber, synthetic fiber, etc. to improve the waterproof level. Although it can meet the design requirements, the engineering practice largely depends on the pouring and maintenance of the construction site. Especially according to the standard requirements, waterproof concrete needs to be cured for no less than 14 days, especially for water-washed sand concrete. Compared with river sand, the water-washed artificial sand particles are poorly assembled, relatively thick, and the edges and corners of the particle surface are sharp and not round enough. , the bulk density is small, the configuration of concrete is prone to bleeding, poor workability, relatively poor frost resistance and impermeability

Coupled with many external conditions, some projects have not been maintained in strict accordance with the requirements of standards and specifications, resulting in low impermeability of concrete, which cannot meet the high standards of anti-seepage performance of special projects.