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以铁尾矿为主要原料制备加气混凝土,研究了铁尾矿的细度和掺量对其性能的影响。结果表明:随着铁尾矿细度的减小料浆的流动性提高,大量气孔的形成使制品的绝干密度降低;但是,细度过小使料浆的流动性降低,在浇注过程中大量气孔的破裂使制品的绝干密度提高。铁尾矿细度减小可提高水化反应速度,生成更多的水化产物,使制品的抗压强度提高。但是,铁尾矿过细使未反应的原料残核过分细小,不能形成良好的气孔结构,导致其抗压强度降低。提高铁尾矿的掺量能使水化产物之间的空隙充分填充,制品的绝干密度随之提高。铁尾矿掺量的提高使托贝莫来石的数量增加,由针片状变为短纤维状,相互交叉形成了网状结构,使制品的抗压强度提高;但是铁尾矿掺量过高使结晶良好的托贝莫来石数量减少,网状结构变得相对松散,导致制品的抗压强度降低。
The aerated concrete was prepared by using iron tailing as the main raw material, and the influence of fineness and content of iron tailings on its performance was studied. The results show that with the decrease of the fineness of iron tailings, the fluidity of the slurry increases and the formation of a large number of pores reduces the absolute dry density of the product. However, the flowability of the slurry decreases when the fineness is too small. A large number of stomatal rupture products to increase the absolute dry density. Reduce the fineness of iron tailings can improve the hydration reaction rate, generate more hydration products, the compressive strength of products. However, the iron tailings too fine so unreacted raw material residual nucleus too fine, can not form a good pore structure, resulting in reduced compressive strength. Increasing the content of iron tailings can make the gap between hydration products fully filled, and the absolute dry density of the product increases accordingly. The increase of iron tailings content makes the amount of tobermorite increase from needle flake to short fiber and cross each other to form a net structure to increase the compressive strength of the product. However, High so that the number of well-crystallized tobibel mullite decreased, the network becomes relatively loose, resulting in reduced compressive strength of products.