인공해수 침지조건에 따른 부식촉진시험과 염화물침투해석에 대한 연구
A Study of Accelerated Corrosion Test and Chloride Penetration Analysis with Artificial Seawater Immersion Condition
1
조회
0
다운로드
8
인용
0
참고문헌
키워드
초록
해수중 환경에서 콘크리트 구조물 내에 매립된 철근은 용존산소의 부족으로 부식이 잘 발생하지 않는다. 이 때문에 해수중 환경의 부식촉진시험은 전기화학적인 방법으로 실시되어, 실제 부식 메커니즘과 맞지 않고 장기거동과의 상관성 도출도 어려운 실정이다. 본 연구에서는 해수중 환경에서의 부식촉진시험법을 정립하기 위해 온도와 염화물농도를 주된 변수로 부식촉진시험을 실시하였다. 부식의 발생 유무는갈바닉 전위측정법과 반전지전위법을 통한 철근부식모니터링 결과로 판단하였다. 부식촉진시험 결과 온도의 영향이 가장 지배적이라고 평가되었다. 염화물량은 시험 시편의 깊이별 염화물 농도를 측정하였다. 동일한 조건으로 FEM 내구성 해석 프로그램인 DuCOM을 통해 염화물침투 해석을 실시하여 입증하였다. 또한, 인공해수 침지 조건에 따른 용존 산소량은 실험을 통해 구했으며 이를 통해 부식촉진시험 결과의 타당성을 검증하였다.
Abstract
Steel reinforcement buried in concrete structure in submerged zone does not easily become corroded due to lack of dissolvedoxygen. For that reason, accelerated corrosion test in submerged state is performed with an electrochemical method, which is notsuitable for actual corrosion mechanism and makes it difficult to find relevance with long-term behavior. In this study, acceleratedcorrosion test was performed with the temperature and chloride concentration as main variables in order to establish a method foraccelerated corrosion test in submerged zone. Corrosion was determined by the result of reinforcement corrosion monitoring basedon galvanic potential measurement and half-cell potential method. The accelerated corrosion test result showed that temperature hadthe most dominant influence. To determine the chloride content, chloride concentration by depth in the test sample was measured. With the same conditions, chloride penetration interpretation was performed by DuCOM, a FEM durability interpretation program. Also, a test was performed to measure dissolved oxygen according to soaking conditions of artificial seawater, which was used forverifying the validity of the accelerated corrosion test result.
참고문헌 (14)
- Establishment of Management and Maintenance of Concrete Structures for Durability, "Ahn, T. S.", Korea Institute of Construction Technology, ~ (2002)
- American Society for Testing and Materials, "Standard Test. Method for Half-Cell Potentials of Uncoated Reinforcing Steel in Concrete: C 876-91, Book of ASTM Standards", pp.1~6 (1999)
- 배수호, "부식촉진시험에 의한 콘크리트 중 철근의 부식 임계 염화물량 평가", 대한토목학회 논문집A, 27(5A), pp.771~776 (2007), 대한토목학회
- Probabilistic Performance Based Durability Design of Concrete Structures, "DuraCrete-Final Technical Report", CUR, 43~68, pp.Document BE95-1347 (2000), R17, European Brite-Euram III
- GjØrv, O. E., "Diffusion of Chloride from Seawater into Concrete", Cement and Concrete Research, 9(2), pp.229~238 (1979)
- Gowripalan, N., "Chloride Ion Induced Corrosion of Galvanized and Ordinary Steel Reinforcement in High-performance Concrete", Cement Concrete Research, 28(8), pp.1119~1131 (1998)
- Kishi, T., "Multi Component Model for Heat of Hydration of Blended Cement with Blast Furnace Slag and Fly Ash", Concrete Library of JSCE, 30(1), pp.125~139 (1997)
- Korean Standards, "Testing method for Water-Soluble Chloride in Mortar and Concrete, KS F 2715", 1~4 (2002)
- Korean Standards, "The Accelerated Corrosion Test of Reinforced Concrete (Wet-Drying Cycles Method), KS F 2599-2", 1~6 (2008)
- Oh, B. H., "A New Method on the Prediction of Corrosion Resistance of Reinforced Concrete Using Accelerated Potentiometric Corrosion Method", Journal of Korea Concrete Institute, 8(5), pp.202~209 (1996)
- 김정섭, "염화물이 철근콘크리트의 부식에 미치는 영향", 한국구조물진단유지관리공학회 논문집, 9(2), pp.147~154 (2005), 한국구조물진단유지관리공학회
- 송하원, "부식 저항성 평가에 따른 균열 콘크리트 보의 부식전위 연구", 한국구조물진단유지관리공학회 논문집, 13(1), pp.97~105 (2009), 한국구조물진단유지관리공학회
- Yadav, A. P., "Electrochemical Impedance Study on Galvanized steel Corrosion under Cyclic Wet-dry Conditions-Influence of Time of Wetness", Corrosion Science, 46(1), pp.169~181 (2004)
- 양승규, "단위시멘트량이 다른 콘크리트 중에서의 철근부식 임계염화물량에 관한 연구", 콘크리트학회 논문집, 20(4), pp.415~421 (2008), 한국콘크리트학회