Low-shrinkage anti-carbonization steel slag geopolymer concrete

Abstract

The invention discloses low-shrinkage anti-carbonization steel slag geopolymer concrete. The steel slag geopolymer concrete comprises the following components: fly ash, mineral powder, kaolin, coarseand fine aggregates of steel slag, sodium hydroxide, sodium silicate and free water. The steel slag geopolymer concrete is characterized in that the mixing proportion of the fly ash is 271.6 kg / m<3>;the mixing proportion of the mineral powder is 38.8 kg / m<3>; the mixing proportion of a sodium hydroxide solution is 55.3 kg / m<3>; the mixing proportion of a sodium silicate solution is 138.7 kg / m<3>;the mixing proportion of the coarse aggregate of steel slag is 1200-1700 kg / m<3>; the mixing proportion of the fine aggregate of steel slag is 619.5 kg / m<3>; the mixing proportion of the kaolin is 83.7 kg / m<3>; and the mixing proportion of the free water is 13.3 kg / m<3>. Compared with the traditional slag aggregate concrete, the steel slag aggregate geopolymer concrete has higher compressive strength, can compensate shrinkage and reduce carbonization, and is enhanced in frost resistance. The mineral powder and the coal ash are mixed, so the expansibility influence of steel slag crystalline substances on the concrete is relieved and delayed. According to the invention, the used raw materials are simple, the early strength of a solidified body is improved by utilizing the waste steel slag and doping a small amount of kaolin, and the concrete has the advantages of low carbon, environmental protection performance, high strength, low shrinkage and good carbonization resistance.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a low-shrinkage, carbonation-resistant steel slag geopolymer concrete and a preparation method. Background technique [0002] Geopolymer concrete is a new type of inorganic polymer with the most development prospects in contemporary times. This kind of concrete prepared with geopolymer as the cementitious material is not only easy to make, but also has higher strength and durability than ordinary concrete under the same conditions. Better performance and corrosion resistance. In the process of preparing geopolymer, the calcination and high temperature conditions of traditional cement are not required, and almost no harmful gas will be generated during the polymerization preparation at room temperature to 150 °C. The amount of carbon dioxide released by making 1 ton of geopolymer is only one-tenth of the amount of carbon dioxide released by making 1 ton of cement. ...

AI Technical Summary

Problems solved by technology

This method uses molten steel slag and the material needs to be calcined by the slag method after mixing, which consumes a lot of energy and the manufacturing process is more complicated. Because the chemical composition of the material is affected by calcination, the strength cannot be guaranteed to be in a relatively stable range.

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