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This paper analyzed the activity of coal-based metakaolin and non-coal-based metakaolin (ordinary metakaolin) commonly used in the Chinese market. The content of kaolin was detected by XPF. The phases of kaolin, metakaolin and corresponding alkali-excited reactants were detected by XRD. The contents of Al (IV), Al (V) and Al (VI) in kaolin and metakaolin were analyzed by 27Al NMR. The micromorphology of kaolin and metakaolin were observed by SEM. The water-resistance of alkali-activateddoi:10.3390/min12030365 fatcat:vvxkbapexzdtnhjfm4g3kzppga