<Ul> <Li> Slag </Li> <Li> Fly ash (from power plants) </Li> <Li> Silica fume (from steel mills) </Li> <Li> Synthetic gypsum (from desulfurisation) </Li> </Ul> <Li> Fly ash (from power plants) </Li> <Li> Silica fume (from steel mills) </Li> <Li> Synthetic gypsum (from desulfurisation) </Li>

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