Preparation method of highly active red mud-based concrete admixture

Abstract

The invention discloses a preparation method of a highly active red mud-based concrete admixture, which belongs to the preparation method of a composite activated mineral admixture material. Using red mud as the main raw material, supplemented by industrial waste residues such as calcium carbide slag and desulfurized gypsum, the highly active red mud-based concrete admixture is obtained by thermally activating the mixture through the combustion heat energy of unburned coal gangue itself; when mixing concrete materials In the process, replace PO52.5, or PO42.5, or PC32.5 portland cement with the red mud composite material prepared by the present invention according to the weight ratio of 20%, under the condition that other mixing materials remain unchanged, mixing It can save 10-20 yuan per cubic meter of concrete. The strength of the mixed concrete at each age is equal to or higher than that of the contrast concrete, and the fresh concrete has good workability, small slump loss, and low heat of hydration. Low, good post-strength extension, sulfate corrosion resistance, strong chemical corrosion resistance, good durability, no adverse effects on concrete performance.

Description

technical field [0001] The invention relates to a method for preparing a composite activated mineral admixture, in particular to a method for preparing a highly active red mud-based concrete admixture. Background technique [0002] Red mud is the solid waste discharged during the production of alumina. my country is a big producer of alumina. In 2009, it produced 23.78 million tons of alumina, accounting for about 30% of the world's total output, and produced nearly 30 million tons of red mud. At present, the comprehensive utilization rate of red mud in my country is only 4%, and the cumulative stockpiles have reached 200 million tons. A large amount of red mud is piled up, which not only occupies land, wastes resources, but also easily causes environmental pollution and potential safety hazards. [0003] Coal gangue is the waste rock separated during coal mining and washing. The comprehensive discharge of coal gangue accounts for 10% to 20% of the raw coal output. It is o...

AI Technical Summary

Problems solved by technology

In recent years, my country has made some progress in the use of coal gangue in the fields of power generation, agricultural fertilizers, chemical products and building materials, but this has not fundamentally solved the current situation of massive accumulation of coal gangue