| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Accelerated Simulating of the Deterioration of Concrete in Gravity Sewers |
| KONG Lijuan1,2,3,*, LIANG Zengyun2, LU Huan2, ZHAO Wengjing2
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1 State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
2 School of Materials Science and Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
3 Hebei Key Laboratory of Advanced Materials for Transportation Engineering and Environment, Shijiazhuang Tiedao University, Shijiazhuang 050043, China |
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Abstract In order to mimic the concrete deterioration in gravity sewers, accelerated laboratory corrosion test was designed by intensifying both the concentrations of H2S gas and the chemical oxygen demand (COD) of sewage by 20 times, and the corrosion development of half-immersed concrete was investigated. The results indicated that the highly-intensified sewage accelerated the acid production by microorganisms and led to the most serious deterioration of concrete, in particular for the concrete at the sewage level, where a thicker biofilm was developed. For the biofilm above the sewage, its thickness became thinner and the color was yellow, indicating the presence of the biochemical oxidization reaction of H2S. However, the deterioration of concrete in the gas phase was not as serious as observed in the field sewers. This demonstrated that the high H2S concentration may be not the most determining factor governing the concrete corrosion, while the population and activity level of sulfide-oxidizing bacteria (SOB) were of likely great importance and should also be intensified. Moreover, the specimen immersed in sewage had the thickest corrosion layer and highest sulfur content. Thus, the distribution of element S could be an effective indicator to reflect the development of concrete corrosion in sewers.
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Published: 10 April 2023
Online: 2023-04-07
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| Fund:National Natural Science Foundation of China(51878421),the Natural Science Foundation of Hebei Province(E2019210284). |
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2023, Vol. 37 
