|
Title |
Chloride Diffusion Coefficient Evaluation in 1 Year-Cured OPC Concrete under Loading Conditions and Cold Joint
|
|
Authors |
오경석(Kyeong-Seok Oh) ; 권성준(Seung-Jun Kwon) |
|
DOI |
https://doi.org/10.11112/jksmi.2017.21.5.021 |
|
Keywords |
내구성 ; 염화물 확산계수 ; 인장응력 ; 압축응력 ; 콜드조인트 ; 재령효과 Durability ; Chloride diffusion coefficient ; Tensile stress ; Compressive stress ; Cold joint ; Aging effect |
|
Abstract |
Cold joint caused by construction delay is vulnerable to shear stress and it allows more rapid chloride penetration and diffusion. In the paper, investigation of chloride diffusion coefficient is performed for 1-year cured concrete considering compressive and tensile loading level and cold joint. The results are compared with the previous results in 91-day cured concrete. In the 1-year cured concrete without loading, 10.7% and 10.5% of diffusion reduction are evaluated for those in 91-day cured concrete, respectively. The reduction ratios are almost similar however the result in cold joint concrete shows much higher values. The results in 1-year cured concrete under 30% and 60% of compressive loading show reduction of chloride diffusion by 10.9% and 5.8% compared with 91-day cured results, which is caused by steady hydration of cement particles, so called, time effect. In the case of tensile loading, the differences in results are not significant regardless of time effect and cold joint since micro cracks which is weak point of concrete is much dominant despite of long term curing.
|