Impermeable concrete with high-mud-content aggregate

Abstract

The invention discloses impermeable concrete with high-mud-content aggregate. The concrete is prepared from the following components in parts by weight: 1200-1900 parts of aggregate, 120-180 parts ofwater, 2-10 parts of a water reducing agent, powder and 20-36 parts of a pretreatment agent. The powder is prepared from the following components in parts by weight: 150-210 parts of cement, 30-90 parts of fly ash, 30-110 parts of mineral powder and 0-40 parts of silica fume. The pretreatment agent comprises a polyvinyl alcohol solution, a sodium sulfate solution, a sodium silicate solution and fly ash in a weight ratio of (10-30): (30-60): (20-50): (2-10). A preparation method of the impermeable concrete with high-mud-content aggregate mainly comprises the following steps: S1, pre-treating the aggregate, namely, soaking the aggregate in a pretreatment agent for soaking pretreatment, and then filtering out the pretreatment agent liquid; and S2, mixing powder, namely, adding a water reducing agent, powder and water into the aggregate in which the pretreatment agent liquid is filtered out in the step S1, and stirring well to obtain finished concrete. The method has the technical effect of improving the impermeability and durability of the concrete.

Description

technical field [0001] The invention relates to the technical field of concrete preparation and production, in particular to anti-seepage concrete with high mud-containing aggregate. Background technique [0002] There is a certain relationship between the impermeability and durability of concrete, because the permeability controls the rate at which external water, gas molecules, and harmful ions penetrate the entire concrete structure, which is not only related to the waterproof and water-retaining effect of concrete, but also to concrete. Frost resistance, chemical corrosion resistance and carbonation resistance are also affected, so improving the impermeability of concrete plays an important role in the high performance of concrete. [0003] Due to the large amount of concrete production in the commercial mixing station and the need for continuous production, in order to improve production efficiency, the quality supervision of sand and gravel aggregates in the commercial...

AI Technical Summary

Problems solved by technology

[0005] However, due to the interfacial transition zone between the sandstone aggregate and the cementitious material, the water-cement ratio in this zone is relatively large, resulting in relatively coarse crystallization products near the surface of the aggregate particles, thus forming a more dense phase than ordinary cement-based phase or mortar. Structure of Microcracks and Porosity

The high mud content concrete in the above patents does not overcome the problems of multiple microcracks and pores in the interfacial transition layer between the sandstone aggregate and the cementitious material, which leads to the impermeability and carbonation resistance of the concrete. Both will be reduced due to factors such as crystal microcracks and pores

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