Study on Physical Mechanics and Fire Resistance of Silica Slime Aerated Concrete for Substation Firewall
The masonry infill wall of substation firewall mostly adopts aerated concrete.Adding silica mud to aerated concrete can effectively consume waste and protect resources.Based on this,aerated concrete specimens with different amounts of silica mud were prepared,and the dry density,porosity and thermal conductivity were tested.The thermal performance,frost resistance and fire resistance of aerated concrete with silica mud were studied.The test results show that:the dry density,porosity,compressive strength and thermal conductivity of aerated concrete decrease,increase,decrease and decrease with the increase of silica mud content,respectively.The fire resistance limit of aerated concrete block can reach more than 3 h under the condition of 42%~66%silica mud addition,which can be used to construct the masonry infilled wall of substation firewall.In order to ensure the frost resistance of aerated concrete,it is recommended that the amount of silica mud added should be in the range of 48%~60%.