Abstract Microstructural observations on the deterioration of concrete structure exposed to sewage water for about 10 years are described. Concrete cores exposed to various aggressive conditions were obtained from a sewage treatment tank and investigated. Examination of the cores by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS) revealed the presence of sulfate-bearing products (gypsum, ettringite and/or thaumasite) due to sulfuric acid attack. In addition, the severity of deterioration of the cores was significantly dependent on exposure conditions. Especially, one concrete core subjected to drying and wetting cycles of sewage water showed the maximum level of deterioration compared to cores continuously exposed to sewage water. More importantly, in order to reduce or mitigate the sulfuric acid attack induced by sewage water, the effectiveness of epoxy-coating was confirmed in this work.
Microstructural observations on the deterioration of concrete structure for sewage water treatment
KSCE Journal of Civil Engineering ; 14 , 5 ; 753-758
2010-07-17
6 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Infrared detection of concrete deterioration
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