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Title |
Effects of Micropores on the Freezing-Thawing Resistance of High Volume Slag Concrete
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Authors |
김래환(Rae-Hwan Kim) ; 김규용(Gyu-Yong Kim) ; 이보경(Bo-Kyeong Lee) ; 신경수(Kyoung-Su Shin) ; 송권용(Gwon-Yong Song) |
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DOI |
http://dx.doi.org/10.11112/jksmi.2015.19.4.067 |
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Keywords |
슬래그 다량치환 콘크리트 ; 미세공극 ; 동결융해 ; 공극률 high volume slag concrete ; micropores ; freezing-thawing ; porosity |
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Abstract |
In this study, effects of micropores on the freezing-thawing resistance of high volume slag concrete are reviewed. Concrete was made with slag which contains the ground granulated blast furnace slag(GGBS) and the pig iron preliminary treatment slag(PS) by replacing 0, 40, 70 %, then compressive strength, freezing-thawing resistance, micropores were reviewed. Also, specified design strength, target air contents were set. Deterioration was induced by using 14-day-age specimen which has low compressive strength for evaluating deterioration by freeze-thawing action. As results of the experiment, despite of specified design strength which has been set similarly and ensured target air contents, the pore size distribution of the concrete showed different results. Micropores in GGBS70 specimen have small amount of water which is likely to freeze because there is small amount of pore volume of 10~100 nm size at 0 cycle which has not been influenced by freezing-thawing. For these reasons, it was confirmed that the freezing-thawing resistance performance of GGBS70 is significantly superior than other specimens because relatively small expansion pressure is generated compared to the other specimens.
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