大掺量粉煤灰蒸压加气混凝土的制备试验研究--以双氧水为发气剂

Experimental Study on the Preparation of High-Volume Fly Ash Autoclaved Aerated Concrete——Taking Hydrogen Peroxide as the Gas Generator

粉煤灰是煤炭燃烧后产生的固体废弃物,若采用填埋处理,则会对环境造成很大危害。试验以粉煤灰为主要基体材料,将双氧水作为发气剂,从影响双氧水的发气条件入手,复掺生石灰和水泥作为胶凝材料,添加石膏作为缓凝剂,另加少量激发剂和稳泡剂,制备蒸压加气混凝土砌块,从而有效实现粉煤灰大掺量利用。检测结果显示,在最佳的反应时间、双氧水浓度、催化剂添加量、溶液pH、水浴温度和双氧水添加量等发气条件下,蒸压加气混凝土砌块的抗压强度为5.2MPa,干密度为579kg/m^(3),符合强度等级A5.0、密度等级B06的产品质量要求。

Fly ash is a solid waste generated after coal combustion,if it is disposed of by landill,it will cause great harm to the environment.In this experiment,the fly ash is used as the main matrix material and hydrogen peroxide is used as the gas generator,starting from the conditions that affect the gas generation of hydrogen peroxide,quicklime and cement are mixed as cementitious materials,gypsum is added as a retarder,and a small amount of activator and foam stabilizer are added to prepare autoclaved aerated concrete blocks,thus effectively achieving the high-volume utilization of fly ash.The test results show that under the optimal gasification conditions such as reaction time,hydrogen peroxide concentration,catalyst addition amount,solution pH,water bath temperature,and hydrogen peroxide addition amount,the compressive strength of autoclaved aerated concrete blocks is 5.2 MPa,and the dry density is 579 kg/m^(3),which meets the product quality requirements of strength grade A5.0 and density grade B06.