Iron Tailings As The Main Material Of The Preparation Of Aerated Concrete Optimization Research

In recent years, with the development of Chinese economy, there is a big increase intailing storage. The environmental problems become more serious. At the same time,the demand of building materials is growing rapidly, in adition, the limitation of claybricks promotes the development of aerated concrete. The subject studies on thepreparation of aerated concrete by using iron tailings, the main study are the ratio ofmaterials and process conditions optimization selection.The experiment uses orthogonal test to design the ratio of materials, preparesdifferent ratio of materials and tests the density and compressive strength. The subjectuses range analysis to analyse the influence of factors to the density and compressivestrength and determines the largest amount of iron tailings. Finally, it can prepare A5.0B07class aerated concrete by iron tailings62%, quick lime25%, cement10%, gypsum3%, aluminum powder0.1%, the ratio of water to material is0.65. The study proves thatit is feasible to make aerated concerte by using Bangmoshang iron tailings.Secondly, the subject selects and tests the optimal process conditions. In the case ofthe maximum amount of iron tailings, the subject studies the effect of static maintenancetemperature, static maintenance time, autoclaved curing time to strength, and the optimalprocess conditions is static maintenance temperature60℃, static maintenance time4h,autoclaved curing time9h. At this point, aerated concrete block compressive strength is5.28MPa, the density is682.4kg/m3, meeting the requirements of A5.0, B07classaerated concrete.At last, the test carries on XRD analysis to aerated concrete, it will be helpful tounderstand the reaction mechanism from microcosmic.