Low-shrinkage mortar for aerated bricks

Abstract

The invention discloses low-shrinkage mortar for aerated bricks. The low-shrinkage mortar comprises, by weight, 55% of quartz sand, 10% of coal ash, 4% of magnesium lime, 2% of calcium carbonate, 3% of bentonite, 2.5% of xonotlite, 9% of cement, 10% of ceramsite sand, 2.5% of redispersible latex powder, 1% of water reducing agents and 1% of additives. The low-shrinkage mortar has the advantages that the low-shrinkage mortar is simple in production process, low in cost and heat conductivity coefficient and high in strength, is environmental friendly and conforms to environmental protection requirements, excellent anti-cracking effects can be realized, energy can be saved, and requirements of construction engineering can be met; the calcium carbonate is grafted and modified and is dispersed in mortar to form dispersion systems, accordingly, internal stress of the mortar can be absorbed, and shrinkage settlement of the mortar can be reduced; calcined magnesium lime and xonotlite powder is added into the mortar, so that the impermeability performance of the mortar further can be improved, and the problem of phenomena of poor hardening, cracking and the like due to the fact that existing mortar is excessively quickly dried and has insufficient moisture can be effectively solved; the quartz sand is pre-treated, so that the plasticity of the mortar can be enhanced, and the construction operability can be improved.

Description

technical field [0001] The invention relates to the field of building material production, in particular to a low-shrinkage mortar for aerated bricks. Background technique [0002] Aerated concrete bricks have many advantages such as light weight, good thermal insulation performance, sound-absorbing effect, and certain strength. The existing aerated bricks have long-standing problems such as leakage, cracking, and low strength of building walls; Mortar has a high water absorption rate, and it is difficult to have good comprehensive properties of crack resistance, durability, impact resistance, earthquake resistance and fire resistance. Contents of the invention [0003] The purpose of the present invention is to provide a kind of mortar for aerated brick with low shrinkage rate, which is realized by the following technical solutions: [0004] A low-shrinkage mortar for aerated bricks, made of the following components by weight percentage: 55% quartz sand, 10% fly ash, 4% ...

AI Technical Summary

Problems solved by technology

[0002] Aerated concrete bricks have many advantages such as light weight, good thermal insulation performance, sound-absorbing effect, and certain strength. The existing aerated bricks have long-standing problems such as leakage, cracking, and low strength of building walls; Mortar has a high water absorption rate, and it is difficult to have good comprehensive properties of crack resistance, durability, impact resistance, earthquake resistance and fire resistance

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