关键词: 蒸养;静停时间;水泥石;氯离子固化

Abstract: The influence of delay period on chloride ions binding capacity of harden cement paste(HCP),based on adsorption equilibrium test,was researched.The change character of chloride ions binding capacity of HCP with subsequent standard curing time after steam curing was also discussed.XRD and DTA were used to analyze the relationship between chloride ions binding capacity of HCP and phases change of hydrated products in HCP.The results show that there are remarkable influences of steam curing on chloride ions binding capacity of HCP.The amount of bounded chloride ions in HCP increase and then decrease over delay period.When subsequent standard curing time reaches to 28 d,the amounts of bounded chloride ions in HCPs with steam curing are obviously lower than that with standard curing;when subsequent standard curing time reaches to 90 d,there are increases in the amounts of bounded chloride ions of steam curing samples,which are even higher than that of standard curing samples.The samples with 4-6 h delay periods show the best chloride ions binding capacity.The amounts of Friedel's salt in HCPs with steam curing are low at early curing period(28 d),however,they continually increase over subsequent standard curing time.

Key words: steam curing;delay period;harden cement paste;chloride ions binding