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Materials (Basel). 2016 Apr 29;9(5). pii: E324. doi: 10.3390/ma9050324.

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

Author information

1
Institute of Environmental Engineering, Faculty of Civil Engineering, Technical University of Kosice, Kosice 04200, Slovak Republic. adriana.estokova@tuke.sk.
2
Institute of Environmental Engineering, Faculty of Civil Engineering, Technical University of Kosice, Kosice 04200, Slovak Republic. martina.kovalcikova@tuke.sk.
3
Institute of Geotechnics, Slovak Academy of Sciences, Kosice 04001, Slovak Republic. luptakal@saske.sk.
4
Institute of Geotechnics, Slovak Academy of Sciences, Kosice 04001, Slovak Republic. prascak@saske.sk.

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.

KEYWORDS:

concrete; corrosion; leaching; silica fume

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