Application of Tailings Chips Partially Substituting Natural Sand and Cementitious Materials in Concrete

Abstract

The invention discloses application of tailing scraps in concrete for partially replacing natural sand and binding materials. According to the application, the tailing scraps and superfine sand are adopted, the fineness modulus of the tailing scraps before mixing is determined to be 3.2-3.6, the fineness modulus of the superfine sand before mixing is determined to be 1.0-1.4, and the mixed sand fineness modulus obtained after the tailing scraps and the superfine sand are mixed at the proportion of 70%-50% is 2.3-2.6. According to the application, natural resources can be saved, the ecological environment can be protected, and the production cost of concrete can be obviously reduced.

Description

technical field [0001] The invention relates to the application of a kind of tailings chip to partially replace natural sand and cementitious material in concrete. Background technique [0002] With the increasing number of engineering construction and the urgent need for environmental protection, natural sand resources have been protected by restricted or prohibited mining. The available natural sand resources are seriously insufficient, but the infrastructure construction projects continue to increase. Finding suitable Natural sand substitutes are necessary. [0003] In the early 1990s, China started the experimental research on the sand replacement with washed tailings chips. It was found that the washed tailings chips not only waste a lot of water resources, but also cause secondary pollution to the water environment. Moreover, the study found that although the strength of the washed tailings sand-substituting concrete has been improved, the workability has been reduced...

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Problems solved by technology

[0003] In the early 1990s, China started the experimental research on sand-replacing washing tailings chips. The research found that water washing tailings chips not only waste a lot of water resources, but also cause secondary pollution to the water environment.

Moreover, the study found that although the strength of the washed tailings sand-substituting concrete has been improved, the workability has been reduced. The main reason is that after the stone chips are washed with water, a large number of fine particles are also washed away, so that the gradation of the sand occurs. It is easy to cause the concrete to bleed; secondly, the fluctuation of the slump of the concrete is caused by the instability of the water content of the stone chips after washing, which brings difficulties to the quality control of the concrete.

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