Abstract
Flue gas desulphurization gypsum (FGD), fly ash (FA) and steel slag (SS) were by-products during the industrial production process, and comprehensive utilization of these by-products could both protect the environment and save resources. The effects of FA and SS on the mechanical properties of FGD and different activating agents on the mechanical properties of FGD matrix composites were studied. The results showed that mechanical properties gradually decreased with the increase of the content of FA and SS which was principally attributed to the poor hydration activity of FA and SS. The flexural strength and compressive strength of FGD matrix composites were significantly improved by adding NaOH, Al2(SO4)3, and compound activating agent respectively and the compound activating agent had a more positive effect than NaOH and Al2(SO4)3.
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