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Time - Dependency of chloride diffusion in concrete: a brief review and preliminary results

Islam, Jahidul, Aldridge, Laurie, Collins, Frank and Gates, Will P. 2015, Time - Dependency of chloride diffusion in concrete: a brief review and preliminary results, Journal of the Australian ceramic society, vol. 51, no. 1, pp. 73-78.

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Title Time - Dependency of chloride diffusion in concrete: a brief review and preliminary results
Author(s) Islam, Jahidul
Aldridge, Laurie
Collins, FrankORCID iD for Collins, Frank orcid.org/0000-0001-6331-5390
Gates, Will P.
Journal name Journal of the Australian ceramic society
Volume number 51
Issue number 1
Start page 73
End page 78
Total pages 6
Publisher Australian Ceramic Society
Place of publication Perth, W.A.
Publication date 2015
ISSN 1018-6689
Keyword(s) Chloride diffusion
Time dependency
Chloride binding
Curing age
Summary Abstract
Chloride ingress into concrete has long been known to decrease the service life of built infrastructure. Inadequate knowledge of the physical reasons associated with chloride diffusion into concrete could generate chloride penetration profiles that become meaningless for prediction of service life. In this study, the effects of pore closure (physical effect) and changes in chloride binding (chemical effect) on chloride diffusion through Australian General Purpose (GP) cement pastes were investigated. Through - diffusion tests and “in - and - out” diffusion tests were conducted to monitor the time - dependent chloride diffusion through cement pastes cured from 1 to 28 days. The through - diffusion test quantified the overall chloride diffusion behaviour at different stages of cement hydration, which was a combined result of physical and chemical processes controlling diffusion. The “in - and - out” test differentiated the contributions of the physical and chemical processes on the chloride diffusion at different stages of cement hydration. As expected, the reduction of chloride diffusivity was significant during the first two weeks of curing, most likely attributed to the significant reduction of porosity as well as establishment of capillary discontinuities within the pore structure. It was also observed that the amount of bound chloride was not constant but increased significantly from 1 to 28 days of curing age.
Notes Export Date: 15 September 2015
Language eng
Field of Research 090503 Construction Materials
Socio Economic Objective 870301 Cement and Concrete Materials
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2015, Australian Ceramic Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30078496

Document type: Journal Article
Collections: Institute for Frontier Materials
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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.