In this study, the effects of cement types and mix proportions on chloride diffusion properties, compressive strength, freeze-thaw resistance and carbonation were investigated. For rapid investigation of chloride diffusion properties, an accelerated t...
In this study, the effects of cement types and mix proportions on chloride diffusion properties, compressive strength, freeze-thaw resistance and carbonation were investigated. For rapid investigation of chloride diffusion properties, an accelerated test was adopted and a novel diffusion coefficient analysis model for this. Preliminary experiments determined the parameters for the accelerated method as 5M of chloride ion concentration, 10 volt of supplied potential and 30mm of specimen thickness. The diffusion coefficient of blended cement concrete was reduced remarkably in comparison with that of portland cement concrete. The results of freeze-thaw cycle test showed that the effective freeze?thaw resistance can be attained by 4% of entrained air using air-entraining agent, irrespective of cement types. In the accelerated carbonation test, the average carbonation rate of the blended cement concrete was higher than that of the portland cement concrete. The carbonation periods of concrete with 6cm of cover thickness were estimated to be 899 years and 161 years in the case of ordinary portland cement concrete and 60% blast-furnace slag-blended cement concrete, respectively.