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http://dx.doi.org/10.4334/JKCI.2013.25.6.621

Evaluation of Half Cell Potential Measurement in Cracked Concrete Exposed to Salt Spraying Test  

Kim, Ki-Bum (SENEST consultant)
Park, Ki-Tae (Korea Institute of Construction Technology SOC Research Institute)
Kwon, Seung-Jun (Dept. of Civil Engineering, Hannam University)
Publication Information
Journal of the Korea Concrete Institute / v.25, no.6, 2013 , pp. 621-630 More about this Journal
Abstract
Several techniques for steel corrosion detection are proposed and HCP (half cell potential) technique is widely adopted for field investigation. If concrete has cracks on surface, steel corrosion is rapidly accelerated due to additional intrusion of chloride and carbon dioxide ions. This study is for an evaluation of HCP in cracked concrete exposed chloride attack. For this work, RC (reinforced concrete) beams are prepared considering 3 w/c ratios (0.35, 0.55, and 0.70) and several cover depths (10~60 mm) and various crack widths of 0.0~1.0 mm are induced. For 35 days, SST (salt spraying test) is performed for corrosion acceleration, and HCP and corrosion length of rebar are evaluated. With increasing crack width, w/c ratios, and decreasing cover depth, HCP measurements increase. HCP evaluation technique is proposed considering the effects of w/c ratios, crack width, and cover depth. Furthermore anti-corrosive cover depths are obtained through Life365 program and the results are compared with those from this study. The results shows relatively big difference in cracked concrete, however provide similar anti-corrosive conditions in sound concrete.
Keywords
steel corrosion; half cell potential; crack; concrete; cover depth;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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