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Materials 2016, 9(5), 324; doi:10.3390/ma9050324

Testing Silica Fume-Based Concrete Composites under Chemical and Microbiological Sulfate Attacks

1
Institute of Environmental Engineering, Faculty of Civil Engineering, Technical University of Kosice, Kosice 04200, Slovak Republic
2
Institute of Geotechnics, Slovak Academy of Sciences, Kosice 04001, Slovak Republic
*
Author to whom correspondence should be addressed.
Academic Editor: Andreas Taubert
Received: 26 February 2016 / Revised: 6 April 2016 / Accepted: 21 April 2016 / Published: 29 April 2016
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Abstract

Current design practices based on descriptive approaches to concrete specification may not be appropriate for the management of aggressive environments. In this study, the durability of cement-based materials with and without the addition of silica fume, subjected to conditions that leach calcium and silicon, were investigated. Chemical corrosion was simulated by employing various H2SO4 and MgSO4 solutions, and biological corrosion was simulated using Acidithiobacillus sp. bacterial inoculation, leading to disrupted and damaged surfaces; the samples’ mass changes were studied following both chemical and biological attacks. Different leaching trends were observed via X-ray fluorescence when comparing chemical with biological leaching. Lower leaching rates were found for concrete samples fortified with silica fume than those without silica fume. X-ray diffraction and scanning electron microscopy confirmed a massive sulfate precipitate formation on the concrete surface due to bacterial exposure. View Full-Text
Keywords: concrete; corrosion; leaching; silica fume concrete; corrosion; leaching; silica fume
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Estokova, A.; Kovalcikova, M.; Luptakova, A.; Prascakova, M. Testing Silica Fume-Based Concrete Composites under Chemical and Microbiological Sulfate Attacks. Materials 2016, 9, 324.

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