Aerated concrete and preparation method thereof

Abstract

The invention relates to aerated concrete and a preparation method thereof, and belongs to the field of concrete. The preparation method comprises the following preparation steps of: (1) mixing red mud with phosphogypsum, adding water, stirring well, then extruding to leach out a water-containing mixture, and continuing to stir the residual water-containing red mud and phosphogypsum mixture after extruding for later use; (2) mixing a protein foaming material with the water-containing mixture leached in the step (1), putting the obtained mixture into a reaction kettle, heating for hydrolyzing, filtering, and stirring the protein foaming filtrate at a high speed for foaming to obtain a composite foaming solution; (3) well mixing cement, filler, sand and the water-containing red mud and phosphogypsum mixture in the step (1), and then mixing and stirring with the composite foaming solution to obtain a concrete mixture; and (4) carrying out pouring, curing and forming to obtain aerated concrete. The prepared aerated concrete is low in dry density and excellent in 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 produced by extracting alumina from bauxite. The annual output of red mud in my country is very high. Because red mud is rich in active components such as dicalcium silicate, alumina, and silicon oxide, it is very important for the hydration of concrete. The formation of products has a certain contribution value, therefore, red mud has gradually attracted attention in the application of concrete production. [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 while maintaining the quality of concrete at a good level is the most concerned issue in t...

AI Technical Summary

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.

Images