Aerated concrete building block and preparation technology thereof

Abstract

The invention discloses an aerated concrete building block. The aerated concrete building block comprises, by weight, 65-72 parts of fly ash, 15-20 parts of quick lime, 5-10 parts of cement, 2.83-3.83 parts of phosphogypsum, 0.1 parts of aluminum powers, 0.05 parts of a foam stabilizer and 0.02 parts of a polypropylene fibre. The modified polypropylene fiber is added to the concrete structure material, such that tensile strength and anti-impact strength of the concrete structure material are improved, a drying shrinkage value of the concrete structure material is reduced, and cracks are prevented from formation and extension during cement solidification. During a green body structural strength formation, a plurality of microcracks are generated due to a plastic shrinkage of the green body, such that during a later autoclaved process, larger cracks are easily generated from the microcracks when the aerated concrete structure extends; meanwhile, because a gradient variation of humidity of the aerated concrete material is large, cracks in the aerated concrete material are easily generated during humidity changing. Therefore, the internal structure of the aerated concrete provided by the present invention can enable improving the disadvantages of generation of aerated concrete wall cracks through an enhancement of the polypropylene fibre.

Description

technical field [0001] The invention relates to an aerated concrete block and a preparation process of the aerated concrete block. Background technique [0002] my country is a country with a large population and shortage of energy and land. The traditional building materials, mainly sintered solid clay bricks, have destroyed fields and taken soil, wasting land resources and polluting the environment. Therefore, prohibiting the use of solid clay bricks in urban construction is an important decision for the country to implement the sustainable development strategy. In accordance with the national land resource protection policy and the spirit of the "Notice on Further Promoting Wall Material Innovation and Promotion of Energy-Saving Buildings" (Guobanfa [2005] No. 33) issued by the General Office of the State Council, the National Development and Reform Commission, the Ministry of Land and Resources, the Ministry of Construction, The Ministry of Agriculture jointly issued t...

AI Technical Summary

Problems solved by technology

[0004] As a new type of wall material, air-entrained concrete is a low-energy, environmentally-friendly new building material, which is very in line with the national policy requirements. However, due to the problems of large drying shrinkage and low strength of ordinary air-entrained concrete, it is not used in actual projects. It often leads to common problems in construction projects such as wall cracks that are not easy to solve

In order to solve the problem of large drying shrinkage of air-entrained concrete, people have made a lot of efforts, including changing the mix ratio of its raw materials, using admixtures and other methods. Although these methods have certain effects, they all have their limitations.