Journal
CEMENT AND CONCRETE RESEARCH
Volume 40, Issue 2, Pages 302-312Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2009.09.023
Keywords
Chloride; Diffusion; Portland cement; Granulated blast-furnace slag
Funding
- Center for Concrete Corea, Republic of Korea
- Korea Agency for Infrastructure Technology Advancement (KAIA) [44493] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Korea Evaluation Institute of Industrial Technology (KEIT) [공동기술-2011-58] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Ministry of Education, Science & Technology (MoST), Republic of Korea [2011-58] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A survey of 11 concrete bridges located in a marine environment at 0.65-48.65 years was examined in terms of chloride transport. As a result, the apparent diffusion coefficient (D) and the surface chloride concentration (C-s) are time dependent; the D exponentially decreased with time and the C-s increased in the form of a logarithm function to time. Using these data, governing equations for the D and C-s were derived to predict the chloride transport in a long term. The time dependent model indicated the higher chloride ingresses in ordinary Portland cement (OPC) concrete than the time independent model, due to a build-up of the C-s with time, but ground granulated blast furnace slag (GGBS) concrete indicated a similar range of the chloride ingresses, due to the rapid decrease in the D. To ensure the accuracy of the model that the present study suggested, the fitted model was compared to the well known model of the LIFE 365 together with a chloride profile obtained from an in-situ examination. Then it was found that the model in the present study well predicted the rate of chloride transport, while the LIFE 365 indicated a poor description of the chloride ingress in a long term, due to a constant C-s and an overwhelming rapid decrease in the D. (C) 2009 Elsevier Ltd. All rights reserved.
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