Plastic concrete for harbor cofferdam engineering impervious walls and preparation method of plastic concrete

Abstract

The invention relates to plastic concrete for harbor cofferdam engineering impervious walls and a preparation method of the plastic concrete. The plastic concrete is prepared from the following components in parts by weight: 90 to 130 parts of cement, 30 to 80 parts of coal ash, 60 to 120 parts of bentonite, 780 to 880 parts of gravel, 750 to 850 parts of river sand, 230 to 260 parts of water and4 to 6 parts of water reducing agent. The preparation method comprises the steps: pouring the cement, the fly ash, the bentonite, the gravel and the river sand into a stirring pot, stirring for 2-3 minutes, uniformly adding an admixture and the water in the stirring process, continuously stirring for 2 minutes, demolding after the prepared and formed plastic concrete is molded for 48 hours, and then performing standard maintenance for 28 days. The cement consumption is reduced, reinforcement is not needed, the problem of steel bar corrosion in the harbor environment is avoided, the cost is saved, high fluidity, high anti-seepage performance, extremely low elastic modulus and convenience in practical engineering application are achieved; and the plastic concrete is mainly used for large marine engineering anti-seepage structures such as harbor cofferdams and dam foundation dams.

Description

technical field [0001] The invention belongs to the technical field of concrete preparation, in particular to a plastic concrete used for seepage-proof walls of harbor cofferdam projects and a preparation method thereof. Background technique [0002] The elastic modulus of the ordinary concrete cut-off wall is relatively high, which is very different from the elastic modulus of the foundation. When the ground subsides and displaces locally, the cut-off wall will bear a lot of pressure, and its side friction will also increase sharply. The internal stress and strain of the anti-seepage wall are all increased, even greater than the strength and ultimate strain of the concrete, and then cracks appear in the wall, resulting in the reduction or loss of the anti-seepage effect. The elastic modulus of plastic concrete is much lower than that of ordinary concrete, and it is very similar to the deformation modulus of the foundation and the surrounding soil cofferdam, so it can well a...

AI Technical Summary

Problems solved by technology

[0002] The elastic modulus of the ordinary concrete cut-off wall is relatively high, which is very different from the elastic modulus of the foundation. When the ground subsides and displaces locally, the cut-off wall will bear a lot of pressure, and its side friction will also increase sharply. The internal stress and strain of the anti-seepage wall are all increased, even greater than the concrete strength and ultimate strain, and then cracks appear in the wall, resulting in the reduction or loss of the anti-seepage effect