To improve the early strength of cement-based materials,nano C-S-H suspensions were prepared and characterized by XRD and Zeta potential.And the effects of nano C-S-H on the exothermic heat of early hydration,strength development and hydration products of Portland cement were studied by hydration exothermic,thermo gravimetry(TG)analysis and scanning electron microscope(SEM).The results showed that stable nano C-S-H with a semi-crystalline structure were prepared.The TG and SEM analysis indicated that the addition of nano C-S-H accelerate the hydration of C3S,especially in the first 24 h and the hydration induction period is significantly shortened.The 8 h,16 h and 24 h compressive strength of mortars containing nano C-S-H increased by 176.0％,145.6％and 43.9％,respectively,compared with the reference mortar.Meanwhile,there was no significant reduction in 3d compressive strength.
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