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Title |
Chloride Ion Penetration Properties of Normal Strength High-Fluidity Concrete Using Lime Stone Powder
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Keywords |
고유동 콘크리트 ; 석회석 미분말 ; 염소이온 확산계수 ; 공극구조 High-fluidity concrete ; limestone powder ; Chloride ion diffusion coefficient ; Pore structure |
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Abstract |
Recently, there are a lot of researches related to the high-fluidity concrete (HFC) with field applications. However, most applications and studies are with concretes with high strength level so there are little studies about durability evaluations such as chloride ion penetration properties with normal strength concrete. Therefore, to evaluate the durability of HFC with normal strength level, this study performed the chloride ion penetration test and observed the micro pore distribution with normal strength HFC which contains limestone powder. Experimental results showed that most micro-pores have diameters between 0.005 to 0.05 ㎛ with HFCs using limestone powder and the average diameter becomes larger with the increase of limestone powder content. Also, it was shown that, with the increase of the limestone powder content, penetration depth and diffusion coefficient of chloride ion increased and diffusion coefficient had good relationships with compressive strength and average pore diameter with the coefficient of determination over 0.90.
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