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Title |
Experimental Evaluation of the Properties of Concrete and Corrosion Inhibition Performance of Reinforcing Steel Using Amine-Based Organic Corrosion Inhibitors
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Authors |
김성수(Seong-Soo Kim) ; 정보선(Bo-Sun Jung) ; 주혁진(Hyeok Jin Ju) |
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DOI |
https://doi.org/10.4334/JKCI.2026.38.3.391 |
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Keywords |
아민계 유기 방청제; 철근 부식; 부식 개시 시점; 방청제 혼입률 amine-based organic corrosion inhibitor; reinforcing steel corrosion; corrosion initiation time; inhibitor content |
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Abstract |
This study experimentally evaluated the effects of amine-based organic corrosion inhibitors on the physical properties of concrete and the corrosion inhibition performance of reinforcing steel. The primary variables included the water to cement ratios (W/C 35 %, 45 %, and 55 %), the typs of inhibitor (nitrite-based and amine-based), and their respective contents. The experimental results indicated that the addition of corrosion inhibitors had a negligible impact on the slump, air content, and compressive strength of the concrete; these physical properties were predominantly governed by the W/C ratio rather than the type of inhibitor. Air content remained stable within the range of 4.1 % to 4.8 % for all mixtures, and the 28-day compressive strength maintained a level similar to the plain specimens, generally within ±2 MPa. According to the accelerated corrosion tests conducted per ASTM G109, the time to reach the cumulative charge threshold of 150 C was delayed by more than 20?50 days in specimens containing inhibitors compared to the plain specimens. Even under the relatively unfavorable condition of W/C 55 %, the use of inhibitors showed a substantial delay in the time to reach 150 C. Regression analysis confirmed a high linear correlation between inhibitor content and the time to reach 150 C. At standard contents, amine-based inhibitors exhibited equivalent or slightly superior performance compared to nitrite-based inhibitors, suggesting their potential as a viable alternative for enhancing the durability of reinforced concrete structures.
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