Preparation of 06 grade gypsum based autoclave-free aerated concrete building blocks

Abstract

The invention relates to a method for preparing an aerated concrete block, in particular to the method for preparing a 06-grade gypsum based vapor pressure free aerated concrete block, which is characterized in that that the method comprises the following steps: 1) preparing raw materials; 2) selecting the raw materials; 3) preparing composite gelled materials; 4) dissolving retarder sodium citrate in water which accounts for 1 / 5 to 2 / 5 of the total amount, stirring the mixture and immediately adding the mixture to the composite gelled material, and stirring the mixture for 2 minutes to obtain liquid slurry; 5) adding a mixture of air-entraining agent aluminum powder and degreaser honeylocust fruit powder to the remaining water to be stirred into a suspension which is then immediately added to the liquid slurry, and stirring the mixture for 3 minutes to obtain mixed slurry; 6) pouring the mixed slurry into a test mold, and performing cutting and demolding after 6 to 8 hours of natural curing to obtain a blank body; and 7) performing damp heat curing on the blank body for 24 hours, and then drying and dehydrating the blank body naturally to obtain the finished product. The method has the advantages of simple process, low cost and high utilization rate of desulfurization construction gypsum; and the finished product has the characteristics of light weight, thermal insulation, sound absorption and insulation, vibration resistance and fire prevention, conditioning treatment, good water resistance, small dry-wet shrinkage, and stable performance.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a preparation method of an aerated concrete block. Background technique [0002] The industrial by-product desulfurization gypsum discharged from the industry currently has a large amount of emissions in my country. If it is not utilized, it will occupy a large amount of land and cause pollution to the environment. Tests have shown that desulfurization gypsum can be turned into treasure after proper treatment. [0003] Gypsum products have a unique "breathing" function within a certain temperature range, which can automatically adjust the indoor temperature and humidity, which has a certain effect on improving indoor comfort, and will not crack due to dry-wet cycles. The apparent density of gypsum products is low, the fire rating is A1, and the fire limit is more than 2 hours, which is twice that of cement products, and does not release harmful and toxic substances. ...

AI Technical Summary

Problems solved by technology

The currently known aerated concrete products are all series of cement-slag-sand, cement-lime-fly ash, cement-lime-sand or various tailings (beneficial to local resources instead of sand as siliceous raw materials). Air concrete products often need to go through a curing process of high temperature, high pressure, and a long time (183~197℃, 1.0~1.5MPa, 8~12h), which requires a large one-time investment and high energy consumption, so the production cost of the product is relatively high

The drying shrinkage value of the autoclaved aerated concrete block is relatively large, and it is easy to crack with the change of ambient temperature and humidity during the application process

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