| 摘要: |
研究了硫氧化细菌的生长特性以及腐蚀后砂浆试样的力学性能和微观结构.结果表明：硫氧化细菌适宜生长在30 ℃，pH值6~7，且硫代硫酸钠质量浓度为10 g/L的环境中，其代谢产物为SO42-![]() ![]() ；砂浆表面的粗糙度与SO42-![]() ![]() 腐蚀程度有关，试验组完全浸没区的粗糙度变化值高于气-液交界面处的粗糙度，形成的生物被膜对砂浆起到了一定的保护作用，对照组气-液交界面处的粗糙度变化值明显低于试验组，说明硫氧化细菌促进了SO42-![]() ![]() 的渗透；120 d时试验组和对照组试样中均检测到了大量板状石膏的存在，且试验组试样中石膏的生成量高于对照组，在75 d后试验组由于大量石膏的膨胀力作用使得砂浆性能最终劣化，硫氧化细菌在一定程度上对砂浆起到了加快腐蚀的作用. |
| 关键词: 硫氧化细菌 砂浆 生长特性 微观结构 力学性能 |
| DOI：10.3969/j.issn.1007-9629.2021.05.006 |
| 分类号:TU528.1 |
| 基金项目:国家自然科学基金资助项目（51978439，52078321）；天津市交通运输科技发展计划项目资助（2018-38）；中国博士后科学基金资助项目（2019M651000）；天津市轨道交通重大专项项目（18ZXGDGX00050）；天津市重点研发计划科技支撑计划重点项目（20YFZCSN00520） |
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| Growth Characteristics of Sulfur Oxidizing Bacteria and Its Influence on Mortar Properties |
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RONG Hui1,2,3, YU Chenglong1, MA Guowei3, WANG Hailiang4, ZHANG Jinrui5
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1.School of Materials Science and Engineering， Tianjin Chengjian University， Tianjin 300384， China;2.Tianjin Key Laboratory of Building Green Functional Materials， Tianjin Chengjian University， Tianjin 300384， China;3.School of Civil and Transportation Engineering， Hebei University of Technology， Tianjin 300401， China;4.School of Civil Enigneering， Tianjin Chengjian University， Tianjin 300384， China;5.State Key Laboratory of Hydraulic Engineering Simulation and Safety， Tianjin University， Tianjin 300072， China
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| Abstract: |
The growth characteristics of sulfur oxidizing bacteria and the mechanical properties and microstructure of mortar specimens after corrosion were studied. The results show that： the sulfur oxidation bacteria are suitable for growth at 30 ℃， pH value of 6-7， and 10 g/L the dosage of sodium thiosulfate， and its metabolite is SO42-![]() ![]() . The roughness of the mortar surface is related to the degree of SO42-![]() ![]() corrosion， and the roughness change value of the completely immersion area in the test group is higher than that at the gas-liquid interface， and the formed biofilm plays a certain protective effect on the mortar. The roughness change value at the gas-liquid interface of the control group is significantly lower than that of the test group， and the sulfur oxidizing bacteria promote the penetration of SO42-![]() ![]() . A large amount of slab gypsum is detected in both the test and control group specimens at 120 d. The content of gypsum generated in the specimens of the test group is higher than that of the control group. And the mortar performances of the test group eventually deteriorate after 75 d due to the swelling force of a large amount of gypsum， and the sulfur oxidizing bacteria play a role in accelerating the corrosion of the mortar to a certain extent. |
| Key words: sulfur oxidizing bacteria mortar growth characteristic microstructure mechanical property |
