Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 149, Issue -, Pages 816-825Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2017.05.184
Keywords
Chloride binding; Granulated blast-furnace slag; Temperature; Diffusion; Microstructure
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Funding
- Petroleum Technology Development Fund (PTDF) of Nigeria
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This study has investigated the impact of a change in GGBS chemical composition on the chloride ingress resistance of slag blended cements under different temperature regimes. Two slags, having alumina contents of 12.23 and 7.77% respectively, were combined with a CEM I 52.5 R at 30 wt% replacement. Chloride binding and diffusion tests were conducted on paste and mortar samples respectively. All tests were carried out at temperatures of 20 degrees C and 38 degrees C. The higher temperature resulted in an increase in chloride binding; attributed to greater degrees of slag hydration. Despite this, chloride ingress was greater at 38 degrees C; attributed to changes in the pore structure and the chloride binding capacities of the slag blends. The more reactive, aluminium-rich slag performed better in terms of chloride binding and resistance to chloride penetration, especially at the high temperature and this was attributed to its higher alumina content and greater degree of reaction at 38 degrees C. (C) 2017 Elsevier Ltd. All rights reserved.
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