A Study on Accelerated Corrosion Test by Combined Deteriorating Action of Salt Damage and Freeze-Thaw
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In this study, the accelerated corrosion test by combined deteriorating action of salt damage and freeze-thawwas investigated. freeze-thaw cycle is one method for corrosion testing; corrosion initiation time was measuredin four types of concrete samples, i.e., two samples mixed with fly ash (FA) and blast furnace slag (BS),and the other two samples having two water/cement ratio (W/C = 0.6, 0.35) without admixture (OPC60and OPC35). The corrosion of rebar embedded in concrete occurred most quickly at the 30th freeze-thaw cycle. Moreover, a corrosion monitoring method with a half-cell potential measurement and relative dynamicelastic modulus derived from resonant frequency measures was conducted simultaneously. The results indicatedthat the corrosion of rebar occurred when the relative dynamic elastic modulus was less than 60%. Therefore,dynamic elastic modulus can be used to detect corrosion of steel bar. The results of the accelerated corrosiontest exhibited significant difference according to corrosion periods combined with each test condition. Consequently, the OPC60 showed the lowest corrosion resistanceamong the samples.
Abstract
In this study, the accelerated corrosion test by combined deteriorating action of salt damage and freeze-thawwas investigated. freeze-thaw cycle is one method for corrosion testing; corrosion initiation time was measuredin four types of concrete samples, i.e., two samples mixed with fly ash (FA) and blast furnace slag (BS),and the other two samples having two water/cement ratio (W/C = 0.6, 0.35) without admixture (OPC60and OPC35). The corrosion of rebar embedded in concrete occurred most quickly at the 30th freeze-thaw cycle. Moreover, a corrosion monitoring method with a half-cell potential measurement and relative dynamicelastic modulus derived from resonant frequency measures was conducted simultaneously. The results indicatedthat the corrosion of rebar occurred when the relative dynamic elastic modulus was less than 60%. Therefore,dynamic elastic modulus can be used to detect corrosion of steel bar. The results of the accelerated corrosiontest exhibited significant difference according to corrosion periods combined with each test condition. Consequently, the OPC60 showed the lowest corrosion resistanceamong the samples.
참고문헌 (14)
- H. W. Song, , Int. J. Electrochem. Sci, 2, pp.1~ (2007)
- B. H. Oh, , J. Korea Concr. Inst, 8, pp.201~ (1996)
- 배수호, "부식촉진시험에 의한 콘크리트 중 철근의 부식 임계 염화물량 평가", 대한토목학회 논문집A, 27(5A), pp.771~776 (2007), 대한토목학회
- 양승규, "단위시멘트량이 다른 콘크리트 중에서의 철근부식 임계염화물량에 관한 연구", 콘크리트학회 논문집, 20(4), pp.415~421 (2008), 한국콘크리트학회
- "KS F 2599-1, Standard test method for the accelerated corrosion of reinforced concrete (autoclave method)", Korean Industrial Standards, ~ (2008)
- "KS F 2599-2, Standard test method for the accelerated corrosion of reinforced concrete (wet-drying cycles method)", Korean Industrial Standards, ~ (2008)
- 박상순, "인공해수 침지조건에 따른 부식촉진시험과 염화물침투해석에 대한 연구", 한국구조물진단유지관리공학회 논문집, 18(1), pp.93~100 (2014), 한국구조물진단유지관리공학회[DOI]
- 박상순, "인공해수 건습반복조건에 따른 콘크리트배합별 부식촉진시험법과 염화물침투해석평가", 한국건설순환자원학회 논문집, 1(3), pp.211~218 (2013), 한국건설순환자원학회[DOI]
- 이재봉, "스프링클러 동배관의 공식부식 발생원인", CORROSION SCIENCE AND TECHNOLOGY, 13(1), pp.6~14 (2014), 한국부식방식학회[DOI]
- "KS F 2437, Standard test method for dynamic modulus of elasticity, rigidity and dynamic Poisson’s ratio of concrete specimens by resonance vibration", Korean Industrial Standards, ~ (2013)
- "KS F 2405, Standard test method for compressive strength of concrete", Korean Industrial Standards, ~ (2010)
- "KS F 2711, Testing method for resistance of concrete to chloride ion penetration by electrical conductance", Korean Industrial Standards, ~ (2012)
- "ASTM C 876-91, Standard Test Method for Half-cell Potentials of Un-coated Reinforcing Steel in Concrete", ~ (1999)
- R. Romagnoli, , Anti-Corros. Method M, 49, pp.11~ (2002)