Preparation method of autoclaved aerated concrete slab

Abstract

The invention relates to the technical field of construction, in particular to a preparation method of an autoclaved aerated concrete slab. The preparation method of the autoclaved aerated concrete slab comprises the steps of slurry preparation, pouring, statical stop, cutting and autoclaved curing; and the slurry comprises the following ingredients in parts by weight: 4 to 7 parts of fried gypsumpowder, 8 to 12 parts of lime, 8 to 12 parts of cement, 45 to 55 parts of a siliceous material, 13 to 19 parts of phosphorus-containing waste residue, and 0.06 to 0.09 part of a gas former; accordingto the invention, the ingredients are reasonably prepared and the process is controlled, so that the internal and appearance quality of the product is improved, the use amounts of the lime and the cement are controlled to directly reduce the production cost, the static-stopping time is shortened to improve the production efficiency, and the use amounts of solid waste gypsum,fly ash, phosphorus slag and the like are increased.

Description

technical field [0001] The invention relates to the technical field of construction, in particular to a method for preparing an autoclaved aerated concrete slab. Background technique [0002] With the continuous improvement of the country's requirements for building energy conservation and emission reduction, the performance of exterior wall materials has also received more and more attention. Compared with traditional clay bricks, autoclaved aerated concrete slabs can not only use waste to reduce resource pressure, but also have excellent performance. Thermal insulation performance is an advantage of less consumables and environmental protection. However, in the process of producing autoclaved aerated concrete slabs, the fluidity of the slurry is insufficient during the static stop and gas generation stage. Compared with the fluidity requirements of the slurry in the static stop and gas generation stage, the hardening time of the green body is prolonged, and the increase in...

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Problems solved by technology

[0002] With the continuous improvement of the country's requirements for building energy conservation and emission reduction, the performance of exterior wall materials has also received more and more attention. Compared with traditional clay bricks, autoclaved aerated concrete slabs can not only use waste to reduce resource pressure, but also have excellent performance. Thermal insulation performance is an advantage of less consumables and environmental protection. However, in the process of producing autoclaved aerated concrete slabs, the fluidity of the slurry is insufficient during the static stop and gas generation stage. Compared with the fluidity requirements of the slurry in the static stop and gas generation stage, the hardening time of the green body is prolonged, and the increase in the amount of lime and cement increases the cost, especially when the lime quality is poor or the sand has a high mud content; at the same time, due to There are many air bubbles inside the steam concrete slab, so it is relatively light, but it causes low compressive strength, and it is easy to cause defects such as insufficient hardening and large shrinkage, and it is easy to cause adverse consequences such as wall cracking and water leakage.

[0003] Patent No. 201611170504.3 discloses an autoclaved aerated concrete block, which consists of the following components by weight: cement: 25-35 parts, gypsum: 5-15 parts, aluminum powder 4-7 parts, ethylene glycol: 5-10 parts Parts, fly ash: 30-40 parts, alkali-resistant glass fiber: 15-25 parts, water reducing agent: 3-5 parts, water: 50-70 parts and admixture: 6-10 parts, by adding alkali-resistant Fiberglass, which increases the strength of the concrete slab but does not improve slurry flow