Anti-crack low-alkali environmental-friendly cement and preparation method therefor

Abstract

The invention discloses anti-crack low-alkali environmental-friendly cement which comprises the raw materials in percentage by weight: 50-65% of limestones, 10-20% of sandstones, 8-15% of dolomite, 2-5% of aluminum ore barren rocks, 4-10% of copper slag, 5-7% of steel scrap and 7-10% of high chloride content waste. According to the anti-crack low-alkali environmental-friendly cement disclosed by the invention, the content of K in the raw material is reduced by virtue of a principle that Cl ions in high chloride content waste and K ions in a high alkali raw material are combined to generate KCL. Moreover, by adopting industrial waste residue copper slag as an irony correcting raw material and aluminum ore barren rocks as an aluminum correcting raw material, not only is the pollution caused by solid waste on the environment solved, but also waste is turned into wealth. The cement disclosed by the invention has the characteristics of being low in alkali content, intermediate in hydration, high in strength, slight in expansion and the like.

Description

technical field [0001] The invention relates to the field of cement, in particular to a crack-resistant low-alkali environment-friendly cement and a preparation method thereof. Background technique [0002] At present, for mass concrete projects, especially dam concrete, the internal temperature rises due to hydration heat release. If the internal temperature is too high, the temperature difference between the inside and outside of the concrete may be too large, resulting in a large temperature stress; when the temperature stress is greater than that of the concrete When the tensile strength is high, it will lead to the cracking of mass concrete; therefore, in general mass concrete projects, especially hydropower dam projects, medium-heat Portland cement with relatively small hydration heat release is usually used as cement. However, in the application 1. During the research, it was found that the autogenous volume deformation of the concrete poured with medium heat Portland...

AI Technical Summary

Problems solved by technology

[0002] At present, for mass concrete projects, especially dam concrete, the internal temperature rises due to hydration heat release. If the internal temperature is too high, the temperature difference between the inside and outside of the concrete may be too large, resulting in a large temperature stress; when the temperature stress is greater than that of the concrete When the tensile strength is high, it will lead to the cracking of mass concrete; therefore, in general mass concrete projects, especially hydropower dam projects, medium-heat Portland cement with relatively small hydration heat release is usually used as cement. However, in the application During the research process, it was found that the autogenous volume deformation of concrete poured with medium-heat Portland cement has a slight shrinkage, which affects the crack resistance of concrete