Fundamental Property of Chloride Inhibiting and Low Heat Cement for Marine Concrete Structures

Abstract

As the construction of marine concrete structures become more common, durability issues are gaining importance. This study introduces a newly developed chloride-inhibiting low-heat cement that is a quaternary blended cement. The primary target application of the newly developed cement is massive marine concrete structures. The adiabatic temperature rise of the newly developed cement was about 30% and 28% lower than for ordinary Portland cement and blast furnace slag cement, respectively, and resistance to chloride ion penetration was much higher compared to blast furnace slag cement. Based on the ASTM C1202 guidelines, the adiabatic temperature rise of the new cement could be considered very low at 28 days, while that of the blast furnace slag cement was in low range. Thus the primary purposes of the newly developed cement can be said to have been successfully attained. In addition, the developed chloride-inhibiting and low-heat cement may satisfy the strength requirement of general-purpose marine concrete applications without significant concerns regarding early-age strength. The developed cement was shown to provide sufficient resistance to freezing-thawing attack as long as proper air content is obtained.