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Title |
Relations Analysis between Strength and Time-parameter in High Performance Concrete Containing GGBFS Cured for 1 year
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Authors |
박재성(Jae-Sung Park) ; 윤용식(Yong-Sik Yoon) ; 권성준(Seung-Jun Kwon) |
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DOI |
https://doi.org/10.4334/JKCI.2018.30.4.375 |
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Keywords |
고강도 콘크리트 ; 고로슬래그 미분말 ; 강도 ; 염화물 확산계수 ; 시간의존성지수m high performance concrete ; GGBFS ; strength ; chloride diffusion coefficient ; time-parameter |
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Abstract |
Concrete is a construction material that has excellent engineering properties, durability, and cost benefit, but when exposed to chloride environment such as marine concrete, chloride ion may penetrate. Thereafter, corrosion in steel rebar occurs and propagates to durability degradation. In the work, strength and chloride diffusion coefficient for 1 year cured condition were evaluated for high performance concrete classified into 9 cases with 3 levels of W/B ratio (37 %, 42 %, 47 %) and 3 levels of GGBFS replacement ratio (0 %, 30 %, 50 %). Time-parameter was derived by regression analysis of the evaluated chloride diffusion coefficients, and the relationships between strength and time-parameter were evaluated. From the result of the evaluation, an improved resistance of chloride attack was evaluated with lower W/B ratios and increasing GGBFS replacement ratios. Especially, in concrete containing GGBFS, chloride diffusion coefficient rapidly decreased from 28 days to 49 days and time-parameter also increased with increasing GGBFS replacement ratio. In OPC concrete, the relations between strength and time-parameter were observed to be non-linear, however time-parameter increased linearly with strength development in GGBFS concrete.
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