Concrete

Abstract

The invention discloses concrete. The concrete is prepared from the following components of ordinary Portland cement, a mineral admixture, a water reducing agent, medium sand, broken stones, an anti-cracking silicone waterproof agent (FQY) and water, wherein the mineral admixture is prepared from pulverized fuel ash and granulated blast-furnace slag; the fineness modulus of the medium sand is 2.3 to 2.9, and the broken stones are continuous graded broken stone particles of which the particle size is 5 to 25 mm. The novel concrete disclosed by the invention has higher performance index on aspects of crack resistance, leakage prevention, working performance and durability.

Description

technical field [0001] The invention relates to a concrete material which can be used in underground engineering. Background technique [0002] With the rapid development of my country's modern industry and the continuous expansion of urban scale, the urban population has increased sharply, and the traffic problems in large and medium-sized cities are very serious. The rail transit project belongs to the urban rapid rail transit system, which has become the backbone of the urban public passenger transport network due to its unaffected by climate conditions and the characteristics of safety, environmental protection and fast transportation. [0003] Since the first subway in London was built in the 1860s, urban rail transit has become a worldwide development trend and an important symbol to measure urban modernization. my country's urban rail transit construction began with the construction of the Beijing Subway in the 1960s. With the continuous growth of the national econom...

AI Technical Summary

Problems solved by technology

However, the existing expansive concrete still has problems such as the mismatch between the expansion history and the temperature history of the concrete, which leads to mixed results in its application.

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