Investigation of mortar corrosion by an acidophilic sulfur-oxidizing microorganism A.thiooxidans
王东升 1冯超 2管方 3SAND Wolfgang 4KRISHNAMURTHY Mathivanan 5万菲 2张瑞永3
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作者信息
1. School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China;Key Laboratory of Advanced Marine Materials,Key Laboratory of Marine Environmental Corrosion and Bio-fouling,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China
2. School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China
3. Key Laboratory of Advanced Marine Materials,Key Laboratory of Marine Environmental Corrosion and Bio-fouling,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China;Guangxi Key Laboratory of Marine Environmental Science,Institute of Marine Corrosion Protection,Guangxi Academy of Sciences,Nanning 530007,China
4. Key Laboratory of Advanced Marine Materials,Key Laboratory of Marine Environmental Corrosion and Bio-fouling,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China;Aquatic Biotechnology,University of Duisburg-Essen,45141 Essen,Germany;Institute of Biosciences,Freiberg University of Mining and Technology,09599 Freiberg,Germany
5. Key Laboratory of Advanced Marine Materials,Key Laboratory of Marine Environmental Corrosion and Bio-fouling,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China
The corrosion behavior of the acidophilic sulfur-oxidizing microorganism(ASOM)Acidithiobacillus thiooxidans(A.thiooxidans)on mortar was investigated for changes of medium and mortar,as well as for weight loss and surface morphology of mortar specimens.Weight loss analysis showed that mortar weight was reduced by(15.1±2.2)％after 56 d.Morphological surface analysis of mortar specimens showed weakly structured fibrous substances with 2-100 μm in size.The pH variations of the mortar surface and medium indicated that biogenic sulfuric acid had been produced by A.thiooxidans.The results prove that A.thiooxidans accelerated concrete corrosion and caused concrete failure.
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