Special thin anti-crack plastering mortar for autoclaved aerated concrete

Abstract

The invention discloses a special thin anti-crack plastering mortar for autoclaved aerated concrete and belongs to the technical field of building materials. According to the special thin anti-crack plastering mortar disclosed by the invention, a dry material is added with water by a mass ratio that water to dry material ratio is equal to 1:4, and then stirred for 3-5 minutes to prepare mortar, wherein the dry material consists of the following components in mass by percentage: 20%-35% of cement, 10%-30% of 40-70-mesh quartz sand, 30%-50% of 80-100-mesh quartz sand, 2%-7% of 200-mesh coarse whiting powder, 1.5%-4% of redispersible emulsion powder; 0.15%-0.5% of water-retaining agent; 0.2%-0.7% of wood fiber and 0.11%-0.45% of short fiber. Being prepared by adopting quartz sand of 40-70 meshes or 80-100 meshes, the special thin anti-crack plastering mortar for the autoclaved aerated concrete disclosed by the invention has an excellent anti-crack performance, realizes effective control on contraction percentage of the mortar, causes no cracks during large-area construction, achieves good caking property, and realizes organic combination between the mortar and the surface layer of the autoclaved aerated concrete.

Description

technical field [0001] The invention relates to a special thin-layer anti-crack plaster mortar for autoclaved aerated concrete, which belongs to the technical field of building materials. Background technique [0002] With the promotion and implementation of energy saving and emission reduction policies in the construction field and the vigorous promotion of wall reform, aerated concrete blocks, as a new type of wall material, are more and more popular in the market because of their series of advantages. Used in construction projects. [0003] Autoclaved air-entrained concrete is a kind of air-entrained concrete, which uses calcareous materials (such as cement, lime) and siliceous materials (such as sand, fly ash, slag) to add aluminum powder as an air-entraining agent. It is a porous silicate block formed by adding water, stirring, pouring, gas expansion, pre-curing and cutting, and then cured by high-pressure steam. The weight per unit volume of autoclaved aerated concre...

AI Technical Summary

Problems solved by technology

[0004] However, due to the high water absorption rate, porous structure and other characteristics of the aerated concrete block itself, the large volume deformation coefficient, low strength, and relatively brittle material, when used in combination with ordinary plastering mortar, the shrinkage coefficient is inconsistent, and it is easy to make the wall Cracks appear on the body, and the plaster layer produces large-scale cracks, hollowing and shedding, which affects the quality of the project and the aesthetic effect of the building wall

In response to the above situation, in recent years, many domestic enterprises and scientific research institutions have carried out development and innovation, and have also formed products with various formulas. At the same time, the country has also compiled the national industry standard JC890-2001, but the quality of many domestic products is uneven. , and not good pertinence and practicability, the problem of cracks in aerated concrete block walls has not been effectively solved