A kind of micro-expansion concrete with ultra-fine sand waterproof and crack-limited under high temperature environment

Abstract

The invention discloses a waterproof micro-expansive super-fine sand concrete in a high temperature environment, which is composed of the following raw materials in parts by weight: 330-350 parts of level-P.O42.5 cement, 560-570 parts of super-fine sand, 480-500 parts of gravels with a particle size of 0-15 mm, 480-500 parts of gravels with a particle size of 15-25 mm, 240-250 parts of gravels with a particle size of 25-40 mm, 55-65 parts of fly ash, 10-12 parts of silicon powder, 160-170 parts of drinking water, 25-30 parts of calcium sulphoaluminate, 0.5-1 part of polystyrene fiber, and 5-6 parts of additives. The concrete disclosed by the invention expands the range of sand for concrete preparation, so that materials are taken more easily, the utilization rate of resources is improved, and the use quality requirements such as durability, physical properties and the like of the concrete can be considered well; and super-fine sand is used as a concrete blending material, so that an effect of waterproof micro-expansive crack control is achieved, and a desiccation fissure problem is effectively solved.

Description

technical field [0001] The invention mainly relates to the construction field, in particular to an ultra-fine sand waterproof crack-limiting micro-expansion concrete in a high-temperature environment. Background technique [0002] Concrete is a building material formed by mixing coarse and fine aggregates such as sand and stone and cementitious materials such as fly ash and water. On the one hand, the large demand in the market has caused a shortage of medium and coarse sand resources, the quality of raw materials is increasingly unable to meet the requirements, and the over-exploitation of river sand and gravel has also caused environmental damage; Increasing demands on quality such as durability, physical properties, and demand for high-quality raw materials further aggravate the shortage of resources. At present, domestic ultra-fine sand concrete is mainly used in special environmental conditions, low-grade concrete and less important structural components, and durabilit...

AI Technical Summary

Problems solved by technology

On the one hand, the large demand in the market has caused a shortage of medium and coarse sand resources, the quality of raw materials is increasingly unable to meet the requirements, and the over-exploitation of river sand and gravel has also caused environmental damage; Demand for quality such as durability, physical properties is getting higher and higher, and the demand for high-quality raw materials further increases the shortage of resources