The apparent and effective chloride migration coefficients obtained in migration tests |
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| Affiliation: | 1. Renewable Energy Research Group (RERG), Department of Building Services Engineering, The Hong Kong Polytechnic University, Hong Kong;2. Faculty of Science and Technology, Technological and Higher Education Institute of Hong Kong, New Territories, Hong Kong;3. Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China;1. Centre for Innovative and Collaborative Construction Engineering, School of Civil and Building Engineering, Loughborough University, Leicestershire LE11 3TU, UK;2. AECOM, Colmore Building, 20 Colmore Circus Queensway, Birmingham B4 6AT, UK |
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| Abstract: | The apparent (Dapp) and effective (Deff) migration coefficients obtained in chloride migration tests are investigated in this study. The presented Dapp profiles in concrete show that the apparent migration coefficient is strongly concentration-dependent. As demonstrated, the binding of chlorides during the migration tests is very low at low free-chloride concentrations and therefore the chloride penetration front progresses throughout the concrete only slightly retarded by the binding. The diffusion flux during migration tests is shown to be insignificant compared to the migration flux. The DRCM obtained from the Rapid Chloride Migration (RCM) tests are found to be equal to the computed Dapp at the locations of the chloride penetration fronts, which gives an indication that the DRCM represents only the migration coefficient at the front. A linear correlation is found between the DRCM obtained from the traditional RCM model and the Deff obtained from the chloride transport model which includes non-linear chloride binding and concentrations in non-equilibrium. |
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