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Red mud was activated to be a mineral admixture for Portland cement by means of heating at different elevated temperatures from 400 ℃ to 700 ℃ . Results show that heating was ef-fective, among which thermal activation of red mud at 600 ℃ was most effective. Chemical analysis suggested that cement added with 600 ℃ thermally activated red mud yielded more calcium ion dur-ing the early stage of hydration and less at later stage in liquid phase of cement water suspension sys-tem, more combined water and less calcium hydroxide in its hardened cement paste. MIP measure-ment and SEM observation proved that the hardened cement paste had a similar total porosity and a less portion of large size pores hence a denser microstructure compared with that added with original red mud.
Red mud was activated to be a mineral admixture for Portland cement by means of heating at different elevated temperatures from 400 ° C to 700 ° C. Results show that heating was ef-fective, among which thermal activation of red mud at 600 ° C was most effective. Chemical analysis suggested that cement added with 600 ° C thermally activated red mud yielded more calcium ion durium ing the early stage of hydration and less at later stage in liquid phase of cement water suspension sys-tem, more combined water and less calcium hydroxide in its hardened cement paste. MIP measure-ment and SEM observation proved the the hardened cement paste had a similar total porosity and a less portion of large size pores therefore a denser microstructure compared with that added with original red mud.