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Title |
Progressive Evaluation of Concrete Deterioration Caused by Chloride-Induced Steel Corrosion Using Impact-Echo Testing
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Authors |
피타젱 리즈키(Rizky Pitajeng) ; 줄피크산 아흐마드 무크티(Julfikhsan Ahmad Mukhti) ; 기성훈(Seong-Hoon Kee) |
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DOI |
https://doi.org/10.11112/jksmi.2024.28.3.37 |
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Keywords |
콘크리트 열화; 부식진행; 비파괴검사; 충격반향법 Concrete deterioration; Corrosion progression; Non-destructive evaluation; Impact-echo |
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Abstract |
This study investigates the evolution of concrete damage due to chloride-induced steel corrosion through Impact-echo (IE) testing. Three reinforced concrete specimens, each measuring 1500 mm in length, 400 mm in width, and 200 mm in thickness, were fabricated using three concrete mixture proportions of blended cement types: ordinary Portland cement, ground granulated blast-furnace slag and fly ash. Steel corrosion in the concrete was accelerated by impressing a 0.5 A current following a 35-day cycle of wet-and-dry saturation in a 3% NaCl solution. Initial IE data collected during the saturation phase showed no significant changes, indicating that moisture had a minimal impact on IE signals and highlighting the slow progress of corrosion under natural conditions. Post-application of current, however, there was a noticeable decline in both IE peak frequency and the P-wave velocity in the concrete as the duration of the impressed current increased. Remarkably, progressive monitoring of IE proves highly effective in capturing the critical features of steel-corrosion induced concrete deterioration, such as the onset of internal damages and the rate of damage propagation. These results demonstrate the potential of progressive IE data monitoring to enhance the reliability of diagnosing and prognosticating the evolution of concrete damage in marine environment.
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