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http://dx.doi.org/10.5345/JKIBC.2015.15.3.281

Properties of Cement Paste Containing High Volume γ-C2S and MgO Subjected to CO2 Curing  

Sung, Myung-Jin (Department of Architectural System Engineering, Hanyang University)
Cho, Hyeong-Kyu (Department of Sustainable Architectural Engineering, Hanyang University)
Lee, Han-Seung (School of Architecture, Hanyang University)
Publication Information
Journal of the Korea Institute of Building Construction / v.15, no.3, 2015 , pp. 281-289 More about this Journal
Abstract
Carbonation of concrete causes reduction of pH and subsequently causes steel corrosion for reinforced concrete structure. However, for plain concrete structure or PC product, it can lead to a decrease in porosity, high density, improvement of concrete, shrinkage-compensation. Recently, based on this theory, research of $CO_2$ curing effect has been performed, but it was mainly focused on its effects on compressive strength using only ordinary portland cement. Researches on $CO_2$ curing effect for concrete containing $CO_2$ reactive materials such as ${\gamma}-C_2S$, MgO haven't been investigated. Therefore, this study has performed experiments under water-binder ratio 40%, and the replacement ratios of ${\gamma}-C_2S$ and MgO were 90%. Micro-chemical analysis, measurement of compressive strength according to admixtures and $CO_2$ curing were investigated. Results from this study revealed that higher strength was measured in case of $CO_2$ curing compared with none $CO_2$ curing for plain specimen indicating difference between 1.08 and 1.26 times, in case of ${\gamma}-C_2S$ 90, MgO 90 specimen, incorporating high volume replaced as much as 90%, it was proven that when applying $CO_2$ curing, higher strength which has difference between 14.56 and 45.7 times, and between 6.5 and 10.37 times was measured for each specimen compared to none $CO_2$ curing. Through micro-chemical analysis, massive amount of $CaCO_3$, $MgCO_3$ and decrease of porosity were appeared.
Keywords
$CO_2$ curing; ${\gamma}-C_2S$; MgO; $CaCO_3$; $MgCO_3$; compressive strength;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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