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Computers and Concrete Volume 22, Number 3, September 2018 , pages 319-326 DOI: https://doi.org/10.12989/cac.2018.22.3.319 |
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Effects of loading conditions and cold joint on service life against chloride ingress |
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Keun-Hyeok Yang, Ju-Hyun Mun, Yong-Sik Yoon and Seung-Jun Kwon
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| Abstract | ||
| RC (Reinforced Concrete) members are always subjected to loading conditions and have construction joints when constructed on a big scale. Service life for RC structure exposed to chloride attack is usually estimated through chloride diffusion test in sound concrete, however the test is performed without consideration of effect of loading and joint. In the present work, chloride diffusion coefficient is measured in concrete cured for 1 year. In order to evaluate the effect of applied load, cold joint, and mineral admixtures, OPC (Ordinary Portland Cement) and 40%-replaced GGBFS (Ground Granulated Blast Furnace Slag) concrete are prepared. The diffusion test is performed under loading conditions for concrete containing cold joint. Investigating the previous test results for 91 days-cured condition and the present work, changing diffusion coefficients with applied stress are normalized considering material type and cold joint. For evaluation of service life in RC continuous beam with 2 spans, nonlinear analytical model is adopted, and service life in each location is evaluated considering the effects of applied stress, cold joint, and GGBFS. From the work, varying service life is simulated under various loading conditions, and the reduced results due to cold joint and tensile zone are quantitatively evaluated. The effect of various conditions on diffusion can provide more quantitative evaluation of chloride behavior and the related service life. | ||
| Key Words | ||
| service life; chloride ingress; stress; cold joint; GGBFS | ||
| Address | ||
| Keun-Hyeok Yang and Ju-Hyun Mun: Department of Plant Architectural Engineering, Kyonggi University, 154-42 Gwanggyosan-ro, Yeongtong-gu, Suwon, 16227, South Korea Yong-Sik Yoon and Seung-Jun Kwon: Department of Civil and Environmental Engineering, Hannam University, 70 Hannam-ro, Daedeok-gu, Daejeon, 34430, South Korea | ||