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Home List of Titles Evaluation of coatings, mortars and mix design for protection of concrete against sulphur oxidising bacteria
Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/193023
- Evaluation of coatings, mortars and mix design for protection of concrete against sulphur oxidising bacteria
- Berndt, M. L.
- Deterioration of concrete in cooling tower basins by microbiologically influenced corrosion (MIC) is a concern in geothermal power plants. The effect of supplementary cementitious materials, epoxy coatings, latex-modified mortars and calcium aluminate cement mortar for protecting concrete from MIC was investigated. Laboratory exposure tests to a particular type of sulphur and iron oxidising bacteria, Thiobacillus ferrooxidans, were performed to rank candidate materials and these were followed by field exposure tests of the best materials in a cooling tower basin. It was determined that partial replacement of cement with 40% blast furnace slag or 5% to 10% silica fume improved resistance to MIC. A replacement level of 60% slag resulted in similar performance to concrete made with ordinary Portland or sulphate resistant cement. Epoxy- and styrene butadiene latex-modified mortars offered protection to concrete but still underwent a degree of attack. Epoxy coatings were found to be effective in protecting concrete. Calcium aluminate cement mortar showed excellent durability in laboratory and field tests.
- Publication type
- Journal article
- Research centre
- Swinburne University of Technology. Faculty of Engineering and Industrial Sciences. Centre for Sustainable Infrastructure
- Construction and Building Materials, Vol. 25, no. 10 (Oct 2011), pp. 3893-3902
- Publication year
- FOR Code(s)
- 0905 Civil Engineering; 1202 Building
- Blast furnace slag; Calcium aluminate cement; Durability; Epoxy coatings; Microbiologically influenced corrosion; Silica fume
- Publisher URL
- Copyright © 2011 Elsevier Ltd. All rights reserved.
- Peer reviewed