A kind of wall material and preparation method thereof

Abstract

The invention relates to a wall material and a preparation method thereof. The wall material is mainly prepared from cement, polyethylene glycol phase change and heat storage particles, porous silicon oxide, a foaming agent, fly ash, a shrinkage reducer and a modifier according to a mass ratio of (20-30):(10-20):(5-15):(3-8):(30-40):(1-5):(3-8). The preparation method comprises the following steps: preparing a gelling material slurry and foam, mixing the foam with the gelling material slurry to prepare a foam slurry, and carrying out pouring molding to obtain the wall material. The wall material prepared in the invention can effectively reduce the thermal conduction coefficient and the dry density and improve the compressive strength, so the wall material can be used in exterior wall bearing walls, the application range of the wall material is enlarged, and good heat insulating and energy saving effects are realized. Industrial waste fly ash is used as a raw material, so the wall material and the preparation method realize waste recycling, and have high social and economic benefits.

Description

technical field [0001] The invention relates to a building material, in particular to a wall material and a preparation method thereof, belonging to the technical field of building materials. Background technique [0002] At present, the self-insulating wall materials that are widely used in my country mainly include: lightweight aggregate concrete blocks, porous bricks, and foamed concrete blocks. Lightweight aggregate concrete blocks are concrete blocks containing lightweight aggregates. Commonly used lightweight aggregates include expanded perlite, lightweight ceramsite, and expanded frog stone. Porous brick is a wall material with a certain porosity prepared from coal rock, shale, clay, etc. as the main raw materials. Foamed concrete is a porous concrete formed by introducing air bubbles into cement mortar or cement slurry, stirring evenly and then solidifying. Due to the existence of a large number of closed air cells, foamed concrete has the advantages of good therma...

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Problems solved by technology

[0003] Although the performance of foamed concrete is excellent, there are still the following defects: (1) The compressive strength is low, and the thermal insulation performance of foamed concrete increases significantly with the increase of the amount of air foam in the cement paste, but its resistance The compressive strength is reduced, such as the dry density is 800kg / m 3 The foamed concrete whose compressive strength is generally lower than 2MPa; (2) the energy-saving effect is poor, and the heat storage performance of the existing foamed concrete is low, and the purpose of storing and releasing heat and saving energy cannot be achieved; (3) it is easy to crack and foam The concrete matrix material is mainly powder and fine particles, and there are a lot of air bubbles in it, which makes the block easy to crack, and with the increase of the air bubble content, the dry density of the test block decreases, resulting in an increase in the possibility of cracking; (4) The shrinkage rate is high. The pores of foamed concrete are generally greater than 70%, and the pore wall is thin. The hydration reaction of the internal particles during the solidification process will cause the matrix to shrink, which will lead to the aggravation of pulverization and cracking, and reduce the finished product. The performance of foam concrete

(5) The water absorption rate is high. The porosity of the foamed concrete and the cracks on the surface lead to its strong ability to absorb water. When the water absorption rate is high, the thermal insulation performance will decrease.

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