A kind of air-entrained concrete and preparation method thereof

Abstract

The application relates to an air-entrained concrete and a preparation method thereof, belonging to the field of concrete. The preparation method includes the following preparation steps: step 1) mixing red mud and phosphogypsum, adding water and mixing evenly, then extruding and draining the aqueous mixture, and the remaining aqueous red mud and phosphogypsum mixture after extrusion continues Stir for later use; step 2) mix the protein foaming material with the water-containing mixture leached in step 1) and put it into the reaction kettle, heat up and hydrolyze, after filtering, stir the protein foaming filtrate at high speed to make foam, and obtain a composite foaming liquid; step 3 ) Mix the cement, filler, sand and the aqueous red mud and phosphogypsum mixture in step 1) evenly, and then mix and stir with the composite foaming liquid to obtain the concrete mixture; step 4) pouring and curing to obtain air entrainment concrete. The air-entrained concrete prepared by the application has low dry density, excellent compressive strength and durability, effectively utilizes red mud, and has good economic value.

Description

technical field [0001] The invention relates to the field of concrete, in particular to an air-entrained concrete and a preparation method thereof. Background technique [0002] Red mud is a waste by-product of alumina extraction from bauxite. The annual output of red mud in my country is very high. Because red mud is rich in active ingredients such as dicalcium silicate, alumina, and silica, it is very important for the hydration of concrete. The formation of the product has a certain contribution value. Therefore, red mud has gradually attracted attention in the production and application of concrete. [0003] However, the high alkali content in red mud has a serious adverse effect on the hydration reaction in cement, which restricts the utilization of red mud in concrete. Generally, the proportion of red mud in cement is only about 20%. , How to improve the utilization rate of red mud while maintaining the quality of concrete at a good level is the most concerned issue in...

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Problems solved by technology

[0003] However, the high alkali content in red mud has a serious adverse effect on the hydration reaction in cement, which restricts the use of red mud in concrete. Generally, the proportion of red mud in cement is only about 20%. How to improve the utilization rate of red mud and maintain the quality of concrete at a good level is the most concerned issue in the application of red mud at home and abroad.

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