Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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Characteristics of Chloride Ion Behavior in an Cement Matrix Using Calcium Nitrite Inhibitor

아질산칼슘 방청제를 사용한 시멘트 경화체 내의 염소이온 거동 특성

  • Min-Cheol Shin (Dept. of Civil & Environmental System Eng., Hanyang University) ;
  • Ki-Yong Ann (Dept. of Civil and Environmental Engineering, Hanyang University)
  • 신민철 (한양대학교 건설환경시스템공학과) ;
  • 안기용 (한양대학교 건설환경공학과)
  • Received : 2024.05.18
  • Accepted : 2024.05.28
  • Published : 2024.06.30
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Abstract

The present study concerns the inhibition of Calcium Nitrite Inhibitor(Ca(NO2)2) in mortar contaminated by chloride ions. Thus, the corrosion resistance and chloride transport were measured for the mortar containing calcium nitrite inhibitor. As a result, an increase in the dosage of calcium nitrite inhibitor resulted in an increase in the chloride threshold concentration for reinforcement corrosion, while the rate of chloride transport was accelerated. However, the calcium nitrite inhibitor could not guarantee the time to corrosion, due to the increased mobility of chlorides. To ensure the passivity of steel, the dosage of calcium nitrite inhibitor must exceed a certain dosage, ranging from 2.0~3.0 % by cement weight.

본 연구는 염소이온이 침투한 시멘트 모르타르에서의 아질산칼슘(Ca(NO2)2) 방청제의 방청 효과에 대한 실험적 연구이다. 이를 위하여 아질산칼슘 방청제를 함유한 시멘트 모르타르에 대하여 내부식성과 염화물 이동에 대한 실험을 실시하였다. 그 결과 아질산칼슘 방청제의 사용량을 증가하면 할수록 철근부식에 대한 염화물 임계 농도값이 증가한 반면, 염소이온의 이동속도는 빨라지는 것을 확인하였다. 그러나 아질산칼슘 방청제를 사용한 시멘트 모르타르의 경우 염소이온의 이동속도가 빨라서 부식 발생시간을 단언하는 것은 어려움이 있었다. 그러나 철근부식에 영향을 미치지 않을 아질산칼슘의 사용량은 본 연구의 범위에서는 시멘트 중량 대비 2.0~3.0% 수준의 결과를 나타내었다.

Keywords

Acknowledgement

본 연구는 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구임(NRF-2020R1A2C3012248).

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