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http://dx.doi.org/10.14190/JRCR.2018.6.1.36

Derivation of Optimum GGBFS Replacement with Durability Design Parameters  

Jang, Seung-Yup (Department of Transportation System Engineering, Graduate School of Transportation, Korea National University of Transportation)
Yoon, Yong-Sik (Department of Civil Engineering, Hannam University)
Kwon, Seung-Jun (Department of Civil Engineering, Hannam University)
Publication Information
Journal of the Korean Recycled Construction Resources Institute / v.6, no.1, 2018 , pp. 36-42 More about this Journal
Abstract
GGBFS(Ground Granulated Blast Furnace Slag)-replacement is very effective for improving resistance to chloride attack and this can induce a long service life for RC(Reinforced Concrete) structures exposed to chlorides. In the work, the design parameters such as cover depth, surface chloride content, critical chloride content, and replacement ratio of GGBFS are considered, and optimum replacement ratio of GGBFS are derived with intended service life. The changes of surface chloride content and cover depth show 3.16~3.38 and 3.02~3.34 times of service life variation, which are most influencing parameters. Critical chloride content shows 1.53~1.57 times of service life variation regardless of w/b(Water to Binder) ratios. In the case of surface chloride content $18.0kg/m^3$, the most severe condition, cover depth over 70 mm and GGBFS replacement ratio over 42% are required with concrete containing w/b ratio under 0.42 for 100 years of intended service life. The condition of $13.0kg/m^3$, GGBFS replacement over 35% is required. For reasonable durability design, quantitative exterior condition and critical chloride content should be determined, and the criteria in Domestic Specification is evaluated to be conservative.
Keywords
GGBFS; Service life; Design parameter; Durability design; Optimum replacement ratio;
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Times Cited By KSCI : 4  (Citation Analysis)
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