High-strength concrete cementitious composition and high-strength concrete thereof

Abstract

The invention discloses a high-strength concrete cementitious composition and high-strength concrete thereof. The cementitious composition is formed by mixing water with a cementitious material, wherein the weight ratio of water to the cementitious material is 0.23-0.25; the cementitious material is formed by mixing the following materials in parts by weight: 52.5 parts of common silicate, 445-525 parts of cement, 0-125 parts of coal ash and 30-65 parts of silica fume; the high-strength concrete is formed by mixing the following materials in parts by weight: 720-805 parts of said cementitious composition, 565-660 parts of manufactured sand, 910-1030 parts of rocklets, 4.7-10.0 parts of a super-plasticizing enhancer and 0-1.3 parts of a retarder. According to the high-strength concrete cementitious composition and the high-strength concrete thereof disclosed by the invention, silicate cement, high-quality silicon powder, high-quality coal ash, the high-performance super-plasticizing enhancer and the high-quality retarder are used, coarse and fine aggregates and water are properly cooled, and the prepared concrete has a good construction performance, a higher compressive strength, a low fluidity loss, a higher strength, and a better erosion and abrasion resistance.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to high-strength concrete in the field of building materials, in particular to impact-resistant and wear-resistant high-strength concrete used in flood discharge parts of hydropower stations. Background technique [0002] The concrete in the overflow dam section, spillway, sand washing bottom hole, flood discharge tunnel, sand discharge bottom hole, tailwater volute and other parts of the hydropower station is usually required to have impact and wear resistance. In China, the concrete strength grades of these parts generally adopt C35, C40, C45, C50, C55, and the highest is C60. China's "Technical Code for Construction of Highway Bridges and Culverts" clearly stipulates that the ratio of the compressive strength of coarse aggregate rock to the strength grade of concrete should not be less than 1.2 to 1.5. According to the technical specifications for the design of the sp...

AI Technical Summary

Problems solved by technology

The rocks in the area where the Upper Atbara Dam Project is located are mainly igneous rocks, and the compressive strength of the parent rock is basically distributed between 80 and 100 MPa, and the comprehensive quality is poor

In addition, C85 high-strength concrete uses a large amount of adhesive material, and the concrete is relatively viscous, and the fluidity of the concrete loses quickly in a high-temperature and dry environment

It is more difficult to prepare C85 high-strength concrete under comprehensive conditions

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