赤泥对粉煤灰蒸压加气混凝土的力学与导热性能影响研究

Effect of Red Mud on Mechanical Property and Thermal Conductivity of Fly Ash Autoclaved Aerated Concrete

赤泥是氧化铝生产过程中的工业废弃物,其处置会占用大量的土地并且可能造成环境污染。而将赤泥代替粉煤灰加入蒸压加气混凝土中可以有效消耗工业废弃物。基于此,利用赤泥替代粉煤灰蒸压加气混凝土中的部分粉煤灰,制备了不同赤泥掺量的蒸压加气混凝土,开展了赤泥掺加后蒸压加气混凝土浆体流动度、绝干密度、抗压强度、导热系数测试,分析了赤泥对混凝土的力学与导热性能的影响规律。研究表明:粉煤灰蒸压加气混凝土浆体的流动度与赤泥替代率成线性减小关系;绝干密度随赤泥替代率的增大先不变后增大;抗压强度随着赤泥替代率的提高而降低;导热系数与赤泥替代率成线性增大关系。

Red mud is industrial waste in alumina production process, its disposal will occupy a lot of land and may cause environmental pollution. Adding red mud instead of fly ash into autoclaved aerated concrete can effectively consume industrial waste. In this paper, red mud was used to replace part of fly ash in autoclaved aerated concrete to prepare autoclaved aerated concrete with different red mud content, and the tests of fluidity, absolute dry density,compressive strength and thermal conductivity of autoclaved aerated concrete slurry were carried out after mixing red mud. The effect of red mud on the mechanical property and thermal conductivity of concrete was analyzed. The results showed that the fluidity of autoclaved aerated concrete slurry decreased linearly with the replacement rate of red mud.The absolute dry density first remained constant and then increased with the increase of red mud replacement rate. The compressive strength decreased with the increase of red mud replacement rate. The thermal conductivity increased linearly with the increase of red mud replacement rate.