Preparation method of high-activity red mud-based concrete admixture

Abstract

The invention relates to a preparation method of a high-activity red mud-based concrete admixture, belonging to a preparation method of a composite activated mineral admixture. The preparation method comprises the steps of: by taking red mud as main raw materials and industrial waste slag of carbide slag, desulfurization gypsum and the like as auxiliary materials, performing heating power activation through the self combustion heat of unburned coal gangue to obtain the high-activity red mud-based concrete admixture, wherein in the process of blending concrete materials, 20% by weight of the red mud composite replaces PO52.5, or PO42.5, or PC32.5 portland cement, under the condition of keeping other blending materials, the cost of per cubic meter concrete blended can be saved greatly, the strength of the blended concrete in each age is equal to or higher than that of the compared concrete, and the newly blended concrete has the characteristics of being good in peaceability, small in slump loss, low in hydration heat, good in later strength transitivity, sulfate corrosion-resistant, strong in chemical corrosion resistance, and good in durability, having no adverse influence on the property of the concrete, and the like.

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...