Light high-strength concrete and preparation method thereof

Abstract

The invention discloses light high-strength concrete, which is prepared from the following raw materials in percentage by weight: 10 to 15 percent of silicate cement, 8 to 12 percent of mineral powder, 6 to 10 percent of coal ash, 2 to 6 percent of wollastonite, 20 to 30 percent of ceramsite,25 to 35 percent of ceramic sand, 0.2 to 0.8 percent of high-performance water reducing agent, 0.05 to 0.3 percent of exciting agent, 0.05 to 0.8 percent of tackifier and 8 to 12 percent of water. The light high-strength concrete has the advantages that compact accumulation is realized by optimizing the grain composition of cementing materials; the mineral powder is subjected to ultrafine grinding, so that the hydrated activity of the mineral powder is improved substantially; and the using quantity of the low-density cementing materials can be increased, and the cohesiveness of slurry is improved by combining the high-performance water reducing agent, the exciting agent and the tackifier, so that the concrete slurry is high in working performance and is not segregable, and the aim of reducing the volume weight of the hardened slurry substantially is fulfilled on the basis of ensuring the mechanical property of the hardened slurry.

Description

technical field [0001] The invention relates to a concrete and a preparation method thereof, in particular to a lightweight high-strength concrete and a preparation method thereof. Background technique [0002] Lightweight high-strength concrete (HSLC) is one of the development directions of concrete technology in the world at present. It has the advantages of light weight and high strength, good durability, alkali-free aggregate reaction, good volume stability, and good thermal insulation performance. The United States, Germany, Japan and other countries have widely used HSLC in marine structures, high-rise buildings, long-span bridges and urban overpasses and other projects. [0003] my country's research on lightweight high-strength concrete started late. Due to the constraints of the strength of lightweight aggregates, it is difficult to increase the strength of concrete; increasing the strength of concrete by increasing the amount of cement will lead to an increase in t...

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Problems solved by technology

[0003] my country's research on lightweight high-strength concrete started late. Due to the constraints of the strength of lightweight aggregates, it is difficult to increase the strength of concrete; increasing the strength of concrete by increasing the amount of cement will lead to an increase in the concrete density; and due to light bone The material is easy to float, and the concrete is easy to segregate, resulting in a decrease in the strength of the concrete and an increase in the discreteness of the bulk density and strength.

Therefore, most of the lightweight high-strength concrete prepared in my country is dry hard concrete prepared in the laboratory. This kind of concrete is not convenient for transportation and pouring, which brings certain difficulties to large-scale promotion.

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