Aerated concrete building block and preparation method thereof

Abstract

The invention discloses an aerated concrete building block which is prepared from the following raw materials in parts by weight: 45 to 55 parts of fly ash, 20 to 30 parts of boiler slag, 3 to 6 parts of phosphogypsum, 17 to 19 parts of quicklime, 1 to 3 parts of cement and 0.07 to 0.085 part of aluminium powder. The preparation method of the aerated concrete building block comprises the following steps of: (1) after mixing the raw materials of the boiler slag and the phosphogypsum fully, adding water, grinding, preparing mixed slurry, adding the water into the fly ash, preparing fly ash slurry, mixing the mixed slurry, the fly ash slurry, the quicklime, the cement and the aluminium powder fully and evenly and preparing a mixed material; (2) pouring the mixed material obtained in the step (1), molding and cutting into a building block blank after precuring at the temperature of 30 to 35 DEG C for 1.5 to 2.5 hours; and (3) steaming and curing the building block blank to obtain the aerated concrete building block.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to an aerated concrete block and a preparation method thereof. Background technique [0002] At present, the wall materials for construction mainly include clay solid bricks and hollow bricks, and concrete blocks with fly ash as the main raw material, among which clay bricks are the leading products. However, due to the large consumption of clay in the manufacture of clay bricks, the damage to farmland and the ecological environment is relatively large. In order to save farmland resources and strengthen the comprehensive utilization of solid waste, lightweight aerated concrete blocks with fly ash as the main raw material are gradually into the construction market. At the same time, in view of the current tense situation of land resources in the city, multi-storey buildings in the city are gradually replaced by high-rise buildings, which requires building materials to hav...

AI Technical Summary

Problems solved by technology

However, when fly ash is used in the manufacture of air-entrained concrete blocks in the prior art, in order to achieve the required compressive strength of concrete blocks, the amount of fly ash is generally low, which leads to the consumption of heavy aggregates such as cement. Increase, this will inevitably increase the bulk density of concrete blocks, so the application of fly ash concrete blocks in the field of high-rise buildings is limited

Moreover, the fly ash produced by many thermal power plants has low activity and fine particles, which is not suitable for the manufacture of aerated concrete blocks.