Investigation on Hydration Characteristics of Zinc-Doped Portland Cement Pastes

Xiang Guo Li; Xiao Bo Yin; Bao Guo Ma; Bei Wu; Quanbin Chen; Yang Lv

doi:10.4028/www.scientific.net/AMR.168-170.623

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Investigation on Hydration Characteristics of Zinc-Doped Portland Cement Pastes

Abstract:

Compressive strength, setting time, hydration heat and hydration product were investigated to evaluate the effects of Zn₂+ ion concentrations and the anion of zinc salts on the hydration characteristics of Portland cement paste. The results show that the hydration characteristics of zinc-doped cement pastes depend on Zn₂+ ion concentrations and the anion of salts. With the incorporation of ZnCl₂, the hydration heat, exothermic rate and the early-age strength of cement pastes were reduced, the arrival time of the highest temperature was delayed, and little negative influences on the compressive strength at 28 days were observed. The total hydration did not decrease incorporating ZnSO₄; the hydration exothermic process was delayed. There were little negative influences on the compressive strength of the samples at 3 days and 28 days. Moreover, for the samples with the same Zn concentration, the retardation effect of ZnCl₂ samples was stronger than that of ZnSO₄ samples.