대한토목학회논문집 (KSCE Journal of Civil and Environmental Engineering Research)

  • 제28권5A호
  • /
  • Pages.709-718
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  • 2008
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  • 1015-6348(pISSN)
  • /
  • 2799-9629(eISSN)
대한토목학회 (Korean Society of Civil Engeneers)
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환경조건을 고려한 염소이온 침투해석 프로그램 개발

Development of Chloride Penetration Analysis Program Considering Environmental Conditions

  • 김기현 (서울대학교 건설환경공학부) ;
  • 장승엽 (한국철도기술연구원) ;
  • 차수원 (울산대학교 건설환경공학부) ;
  • 장승필 (서울대학교 건설환경공학부)
  • 투고 : 2007.08.07
  • 심사 : 2008.06.03
  • 발행 : 2008.09.30
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초록

본 논문에서는 온도 및 습도 등 환경조건의 변화와 염소이온의 확산, 이송 및 구속 현상을 고려하는 콘크리트 내부로의 염소이온 침투해석 프로그램을 개발하였다. 외부 환경조건의 변화를 고려하기 위하여 온도와 습도분포 해석을 동시에 수행할 수 있도록 하고, 확산계수의 온도, 습도 및 재령에 대한 변동성을 반영하였다. 실측데이터와의 비교를 통해 개발된 프로그램이 실측결과와 잘 일치함을 검증하였으며, 건습의 반복 등 외부 환경조건의 변화에 따라 콘크리트 내부 수분량이 변화하는 경우 염소이온이 표면부에 축적되는 현상의 기본 메커니즘과 그에 따른 철근부식 발생의 촉진과정을 예제해석을 통해 규명하였다.

Developed is a chloride penetration analysis program in which changes of environmental conditions such as temperature, humidity and external chloride concentration, and the diffusion, convection and binding of chlorides are considered. In order to consider the changes of environmental conditions, analyses for temperature and moisture distribution are implemented simultaneously, and variation of diffusion coefficients due to temperature, humidity and age is also considered. By comparing the calculated total chloride contents with some experimental data, it has been confirmed that the proposed analysis program can trace measured chloride distribution well. Also, through some example analyses, the mechanism of accumulation of chlorides at near surface and acceleration of corrosion of steel reinforcement in case that the moisture distribution changes according to repeated drying and wetting cycles have been verified.

키워드

참고문헌

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