Effects of Fluorogypsum and Flue-Gas Desulfurization Gypsum on the Hydration and Hardened Properties of Alkali Slag Cement

In order to explore the influence of types waste gypsum on properties alkali slag cement, fluorogypsum (FG) and flue-gas desulfurization (FGD) were comparatively investigated. Moreover, action mechanisms FG FGD cement analyzed. The results show that both prolonged setting time paste. However, prolongation effect was more pronounced than gypsum. When compressive strength maximum, contents 5 6 wt.%, respectively. At 3 28 days, compared control sample, strengths increased by 59.3% 24.3%, 66.9% 33.9%, Furthermore, XRD, TG-DTA SEM-EDS showed that, with increase in gypsum, ettringite easily produced hydration products abundant system. greater content paste, less accumulated heat hydration. change micro-structure caused formation main reason for difference cement.