High-performance cast-in-place foam concrete and preparation method thereof

Abstract

The invention belongs to the technical field of an energy-saving building material, and relates to high-performance cast-in-place foam concrete and a preparation method thereof. The high-performance cast-in-place foam concrete is prepared from the following raw materials in parts by weight: 100-520 parts of cement, 25-180 parts of admixture, 80-320 parts of lightweight aggregate, 0.8-6.4 parts of foaming agent, 75-300 parts of water, 1.6-12 parts of additive and 2-28 parts of modifier in a mixing manner. The foam concrete prepared by the preparation method is light in weight, high in strength, excellent in waterproofness, good in heat preservation effect, free of poison, durable and the same as a building in service life, and is suitable for casting internal and external wall bodies in place, roof and ground heat preservation and foundation pit backfill of a pier pavement and the like.

Description

technical field [0001] The invention belongs to the technical field of building thermal insulation and energy-saving materials, and relates to a high-performance cast-in-place foam concrete and a preparation method thereof. Background technique [0002] At present, my country's development has been advocating low-carbon environmental protection, energy conservation and emission reduction, and lightweight and thermal insulation of building materials. Among the organic materials commonly used in the building insulation material market, such as polystyrene foam board, phenolic foam board, etc., their fire performance is extremely poor and they are easy to burn. The best phenolic foam can only reach B1 level, and has poor weather resistance and long service life. Short and expensive to replace. Among inorganic thermal insulation materials: foam glass, foam aluminum, and foam ceramics have high cost prices; although fiber thermal insulation materials such as rock wool are slight...

AI Technical Summary

Problems solved by technology

In terms of thermal insulation, low-quality and low-performance cast-in-place construction accounts for about 90%. There are very few high-performance cast-in-place products and high-performance foam concrete products that meet the technical requirements. The existing defects: ① In the secondary During the stirring process, the lower the dry density, the more difficult it is to mix the foam and the slurry evenly, which will lead to uneven foam pore size and distribution, low strength, and reduced thermal conductivity; ②During the secondary stirring process, with the loss of foam, The slurry will be gradually diluted, which will cause the aggregate to settle and cannot be evenly distributed in the slurry, making it difficult to guarantee the construction and strength; ③The strength and thermal conductivity conflict. If you want to reduce the thermal conductivity, you need to increase the foam in the foam concrete. content, that is, the porosity, which leads to a decrease in strength; ④The pore wall structure components in foam concrete are unreasonable, forming incompletely closed pores, resulting in increased water absorption and reduced thermal conductivity; ⑤Ordinary Portland cement has a long setting time and foam The defoaming process is fast, which leads to the occurrence of mold collapse; ⑥The addition of sulphoaluminate cement will pulverize after a certain period of time as the external environment changes