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http://dx.doi.org/10.5345/JKIBC.2019.19.6.511

Variation of Critical Chloride Content of Rebar Embedded in Concrete with Admixture  

Park, Jang-Hyun (Department of Architectural Engineering, Hanyang University)
Lee, Yun-Su (Department of Architectural Engineering, Hanyang University)
Lee, Han-Seung (Department of Architecture & Architectural Engineering, Hanyang University ERICA)
Publication Information
Journal of the Korea Institute of Building Construction / v.19, no.6, 2019 , pp. 511-520 More about this Journal
Abstract
The critical chloride content of rebar embedded in concrete was experimentally evaluated according to the admixture replacement ratio and admixture type. Four types of reinforced concrete were mixed OPC 100%, OPC 70% + GGBFS 30%, OPC 40% + GGBFS 60%, and OPC 40% + GGBFS 40% + FA 20%. NaCl solution was supplied to the specimens, and the open circuit potential of the embedded rebar was monitored. The specimens determined to initiate corrosion were cut at intervals of 5mm from the NaCl solution supply surface and conducted to chlorine ion profile. Corrosion initiation time of rebar embedded in concrete was delayed as the admixture replacement ratio increased. Looking at the critical chloride content of the types of reinforced concrete, it was highest in OPC 1.46kg/㎥, followed in order by S30 0.98kg/㎥, TBC 0.74kg/㎥, and S60 0.71kg/㎥.
Keywords
concrete; admixture; open circuit potential; corrosion; critical chloride content;
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Times Cited By KSCI : 2  (Citation Analysis)
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