Shaft and drift injection concrete material with washery rejects and washed sand as aggregates

Abstract

The invention discloses a shaft and drift injection concrete material with washery rejects and washed sand as aggregates, and belongs to concrete materials for shaft and drift supporting. The concretematerial takes cement, fly ash, the washery rejects and the washed sand in a washing and dressing coal plant of a coal mine as the aggregates, and takes an accelerator and a water-reducing agent as additives, wherein a ratio of a cementing material to the washed sand to the washery rejects is 1 to 2 to 2, and then 3 percent of the accelerator and 1 percent of the water-reducing agent are doped; the cementing material is prepared by mixing the cement with the fly ash; the fly ash is internally doped, accounts for 30 percent of weight of the cement, and reaches the intensity grade C20 of shaftand drift injection. The concrete material applied to coal shaft and drift supporting has the advantages that supporting cost is reduced, and mine benefits are increased; in addition, beneficial reuseof the washery rejects and the fly ash is realized; the concrete material is an important measure of reducing the pollution in the coal industry and practicing ecological civilization and green mining.

Description

technical field [0001] The invention relates to a concrete material for shaft support, in particular to a shaft sprayed concrete material for washing gangue and sand into aggregates. Background technique [0002] At present, the amount of coal gangue in my country has accumulated more than 5 billion tons, and it continues to increase at a rate of 300 million tons every year. A large amount of coal gangue stockpiling not only wastes land resources, but also causes spontaneous combustion, rain, mud, etc., causing serious harm to the environment. Fly ash is the main solid waste discharged from power plants after burning coal. In recent years, with the rapid development of the power industry, the discharge of fly ash has increased year by year, and it has become one of the industrial wastes with a large discharge in my country. The accumulation of fly ash will not only generate dust and pollute the atmosphere; moreover, if it is discharged into the water system, it will easily...

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Problems solved by technology

[0005] Technical problem: the purpose of the present invention is to provide a kind of shotcrete material for shaft roadway washing gangue and sand as aggregate, which solves the problem of high cost, environmental protection and energy saving for shaft roadway shotcrete with cement, gravel and river sand as aggregate. Problems that do not meet the requirements

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