Thin-layer finishing mortar for autoclaved aerated concrete

Abstract

The invention discloses thin-layer finishing mortar for autoclaved aerated concrete and belongs to the technical field of building materials. The thin-layer finishing mortar for the autoclaved aerated concrete is prepared from the following raw materials in percentage by weight: 20% to 30% of cement, 40% to 55% of sand with the grain size of 30 to 50 meshes, 2% to 10% of ash calcium powder, 2% to 10% of heavy calcium carbonate powder, 15% to 30% of aerated waste powder with the grain size of 5 to 100 meshes, 0.2% to 0.5% of cellulose and 1.2% to 2.5% of redispersible latex powder. The thin-layer finishing mortar for the autoclaved aerated concrete, disclosed by the invention, is excellent in water retention performance, high in adhesion and good in workability.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a thin-layer plastering mortar for autoclaved aerated concrete. Background technique [0002] Aerated concrete block is the only single wall material that can meet the requirements of wall material innovation and 50% energy saving at the same time. It has incomparable advantages for hot summer and warm winter areas. Research and development work has also made no small achievements. [0003] Autoclaved air-entrained concrete is a kind of air-entrained concrete, which is to add aluminum powder as an air-entraining agent to the ingredients of calcareous materials such as cement, lime and siliceous materials such as sand, fly ash, and slag, add water to stir, and pour into molding , gas expansion, pre-cured cutting, and then cured by high-pressure steam is a porous silicate block. The unit volume weight of autoclaved aerated concrete is one-third of that of c...

AI Technical Summary

Problems solved by technology

[0005] The application of aerated concrete blocks still has the following problems: (1) aerated concrete blocks have small bulk density and low strength, while ordinary mortar has large bulk density, high strength, and large thermal conductivity

(2) The aerated concrete itself has strong water absorption, while the ordinary mortar has poor water retention, and the water is quickly absorbed, which greatly reduces the strength growth of the mortar and the bonding force between the mortar and the wall, which is easy to cause the mortar to fall off, hollow and crack. shell

(3) Using traditional thick layer construction, even with special masonry plastering mortar, the construction method is still not improved, the thickness of the mortar joints of the masonry and the thickness of the plastering layer are at least 10mm, and some thick parts even reach 20mm ~ 30mm, Lead to the generation of thermal bridges in masonry, and then cause problems such as hollowing and cracking of the wall

(4) In the traditional wet construction, due to poor control of the degree of watering and wetting, the moisture content between different blocks will be inconsistent, and the shrinkage deformation of the wall in the later stage will be different, resulting in the occurrence of dry shrinkage cracks in the masonry (refer to Literature, "Research on Construction Performance of Special Mortar for Air-entrained Concrete Block", Bi Junjun, Zhou Dongkui, Fujian Architecture, 2009 No. 12, Total No. 138, pp. 95-97)

[0006] The above-mentioned technical problems have seriously hindered the further application and popularization of air-entrained concrete, so it is urgent to develop thin-layer plastering mortar matched with autoclaved air-entrained concrete blocks

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