Effects of Replacement Ratio and Curing Condition on Properties of Concrete Incorporating Blast-Furnace Slag

摘要

The purpose of this study is to investigate the characteristics of strength development and carbonation rate due to the replacement ratio of blast-furnace slag and the curing conditions. Cementing efficiency factor k is introduced to evaluate the ability of blast-furnace slag. The water-binder ratios were 0.40, 0.50 and 0.65 containing blastfurnace slag with replacement ratio of 50%, and the specimens were cured in water for 5,10, 28 days. After the designated curing duration, the compression tests were conducted and the concrete prisms were stored in accelerated carbonation test chamber. Test results show that the equivalence factor kc on strength development is larger than the factor kn on carbonation rate in every curing condition. Furthermore, the pore structure and the variation of calcium hydroxide and calcium carbonate were measured to evaluate the influence of replacement ratio of blast-furnace slag and curing condition.