关键词: 脱硫石膏;矿渣;激发;水硬性;强度

Abstract: The influence of the activation components of Portland cement and some other 2 mineral materials on the strength of FGD gypsum slag system was investigated by orthogonal experiment.The microstructure of the hydrated sample was analyzed by SEM and XRD.The results show that: with the activation of Portland cement and the mineral materials,the mortar compressive strengths of FGD gypsum and slag cementitious are above 17 MPa and above 58 MPa at ages of 3 d and 28 d, curing in 20 ℃water.The optimum proportion of Portland cement and some other 2 mineral materials is 6:6:5 and the dosage of the excitation components is about 17%of the quality of the FGD gypsum-slag system.With the activation of Portland cement and the 2 mineral materials, the hydration products of FGD gypsum slag system are mainly ettringite and C-S-H.A large number of ettringite and gypsum crystals crossed each other,and the pore among them is filled with the unhydrated FGD gypsum and slag particles.With the combination of C-S-H the dense microstructure formatted.

Key words: desulfurization gypsum;blast furnace slag;activation;hydraulic hardening;strength