快硬早强磷渣基胶凝材料的制备及其微观结构研究

Preparation and Microstructure of Phosphorous Slag-based Cementitious Materials with High Early Strength

碱磷渣胶凝材料早期强度较低,不利于实现快速修补,通过在碱磷渣材料中掺入适量的石墨尾矿粉和普通硅酸盐水泥进行快硬早强磷渣基胶凝材料的研制.结果表明,掺入10%的普通硅酸盐水泥(占胶凝材料总质量的百分比,下同)和15%的石墨尾矿粉时,可有效提高碱磷渣胶凝材料的早期强度.当硅酸钠掺量为5%(以Na_2O计)时,所开发的快硬早强磷渣基胶凝材料胶砂试件的3d抗压强度27.3MPa、3d抗折强度4.1MPa,28d抗压强度56.8MPa、28d抗折强度8.3MPa,符合GB175-2007对普通硅酸盐水泥P.O42.5R的强度要求.运用XRD、SEM、综合热分析等微观测试技术研究了快硬早强磷渣基胶凝材料的水化硬化和微观结构.

Due to repairing. The ra the low early strength of alkali phosphorous slag cement, it is not conducive to achieve rapid pid hardening early strength of phosphorus slag-based cementitious materials is developed through adding appropriate amount of graphite tailings and ordinary Portland cement. The results show that the early strength of alkali phosphorus slag cementitious material can be effectively improved by the incorporation of 10% ordinary Portland cement（by the weight of hinder） and 15% graphite tailings. When the dosage of sodium silicate is 5%（by Na20）, the developed mortar specimens of phosphorus slag cementing material are that 3d compressive strength is 27.3 MPa; 3d flexural strength is 4.1 MPa; 28d compressive strength is 56.8 MPa; and 28d flexural strength is 8.3 MPa. It accords with GB175-2007 requirement towards the intensity of the P. O 42.5R. The hydration and hardening process and microstructure of phosphorous slag-based cementitious materials were studied by microscopic testing methods, such as X-ray diffraction, scanning electron microscope and integrated thermal analysis.