Plastic concrete for cutoff wall

Abstract

The present invention provides a plastic concrete for a cutoff wall, and belongs to the technical field of cutoff concrete engineering. The plastic concrete comprises a cementitious material, an aggregate, a water-reducing agent and water, wherein a ratio of the water to the cementitious material in the plastic concrete is 0.92, the cementitious material comprises, by weight, 15-35 parts of cement, 10 parts of bentonite, 25 parts of clay, and 30-50 parts of fly ash, the aggregates comprises sand and stone, the sand ratio of the aggregate is 47%, per stere of the plastic concrete is added with 1485 kg of the aggregate, the particle size of the stone is 5-20 mm (continuous particle size distribution), and the plastic concrete comprises 0.2 parts by weight of the water-reducing agent. With the plastic concrete prepared by the method of the present invention, the addition amount of the fly ash can be significantly improved, and the use amount of the cement can be reduced, such that the cost of the plastic concrete is significantly reduced; based on the current raw material market price (the cement is 490 yuan / t, the type II fly ash is 160 yuan / t), the cost of per stere of the plastic concrete can be reduced by about 33-56 yuan.

Description

technical field [0001] The invention relates to a plastic concrete for an anti-seepage wall, in particular to a plastic concrete for an anti-seepage wall with a high content of fly ash, and belongs to the technical field of anti-seepage concrete engineering. Background technique [0002] From the 1960s to the 1980s, the wall materials of my country's anti-seepage walls mainly used rigid concrete such as ordinary concrete (also known as reinforced concrete), clay concrete and fly ash concrete. The strength is as high as 15000-32000MPa. Due to its high compressive strength and large elastic modulus, it is suitable for underground walls with joint functions of anti-seepage, soil retaining and load-bearing. However, if only rigid concrete is used as the material of the cut-off wall, the project cost is too high, as high as 600-1200 yuan per square meter, and the rigid concrete is prone to local cracking under the action of the horizontal force of the foundation soil, resulting in...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that in the prior art, for plastic concrete with a fly ash content ≥ 30wt%, the cohesive force of the plastic concrete decreases, thereby causing an excessive decrease in the early strength of the plastic concrete, which affects the early stage of the cut-off wall. Construction, and the elastic modulus of plastic concrete in the later stage, the impermeability and other performance indicators in the later stage cannot reach the general technical indicators of plastic concrete for cut-off walls, and then provide a 30wt% ≤ fly ash content ≤ 50wt%, satisfying Plastic concrete for cut-off walls required by the above performance indicators

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