The effects of nano-metakaolin(NMK)on the strength and chloride ion permeability of fly ash(FA)mortar were studied.The fluidity of cement mortar with the addition of NMK and FA was tested by jumping table method.The rapid chloride ion migration coefficient method(RCM)was applied to examine its chloride ion permeability coefficient.The effect of NMK on the microscopic morphology of fly ash mortar during the hydration process was observed by field emission scanning electron microscopy(SEM).The relation between the evolution process of the morphology and its macroscopic properties was discussed.It is shown that NMK reduces the fluidity of FA mortar,while improves its chloride ion permeability and strength.SEM analysis results proved that NMK increases the hydration products,and the microstructure compactness is largely improved.
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