石墨尾矿蒸压加气混凝土制备方法及其性能分析

Preparation and Performance Analysis of Autoclaved Aerated Concrete with Graphite Tailings

为探寻蒸压加气混凝土新的组成原料及配方,以石墨尾矿作为硅质材料,并辅以水泥、生石灰、磷石膏、铝粉等原料,研究了蒸压加气混凝土(AAC)的制备方法,探讨了钙硅比(Ca/Si)对蒸压加气混凝土抗压强度、干密度的影响,并运用XRD、SEM测试技术研究了不同钙硅比蒸压加气混凝土的水化产物和微观结构特征。在此基础上,试验研究了水料比(W/S)、发气剂用量(即铝粉用量)等配比参数对蒸压加气混凝土抗压强度和干密度的影响,得到了以石墨尾矿为硅质材料制备蒸压加气混凝土的配合比。该配比混凝土在50℃时浇筑并静养,之后在1.1MPa环境中恒温蒸养6h,得到了(A5.0,B07)级的蒸压加气混凝土的制品。

This paper is to explore the new composition of autoclaved aerated concrete raw materials and formulations.The preparation method of autoclaved aerated concrete(AAC)is studied by using graphite tailings as siliceous material,supplemented with other raw materials such as cement,quicklime,phosphogypsum and aluminum powder.The influence of calcium to silicon ratio(Ca/Si)on compressive strength and dry density of autoclaved aerated concrete is discussed,and the hydration products and microstructure of autoclaved aerated concrete with different calcium to silicon ratios are studied by XRD and SEM techniques.Then,the impacts of the proportioning parameters including the ratio of water to material(W/S),gas generator dosage(the amount of aluminum powder)on the compressive strength and dry density of aerated concrete are studied by test.Thus,the laboratory mix ratio of autoclaved aerated concrete prepared from graphite tailings as siliceous material is obtained,which is poured and rested at 50℃.After that,the product which satisfies the requirements of(A5.0,B07)grade autoclaved aerated concrete is obtained by steaming at a constant temperature for 6 hours in 1.1 MPa.