| 摘要: |
| 采用傅里叶变换红外光谱（FTIR）、超景深显微镜、扫描电镜（SEM）、能谱仪（EDS）、X射线衍射（XRD）、热重分析（TG DTG）等,研究了海水环境下砂浆表面形成的生物被膜特性及其对砂浆性能的影响.结果表明：海水环境中硫氧化细菌会在砂浆表面附着形成大量的生物被膜,该生物被膜由多糖、蛋白质和微生物构成,其中微生物多呈卵状和气泡状;生物被膜在15d后开始快速繁殖,75d后逐渐脱落,90d后新的生物被膜重新附着;120d时无生物被膜砂浆试样的抗压强度为525MPa,强度增长率为038%,矿化产物中石膏含量较多,而有生物被膜试样的抗压强度为681MPa,强度增长率为3172%,矿化产物中石膏含量较少.这表明生物被膜的存在影响了海水中腐蚀介质的传输,对砂浆起到缓蚀作用. |
| 关键词: 砂浆 生物被膜 硫氧化细菌 海水 强度增长率 |
| DOI：103969/j.issn.1007 9629202104001 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（51978439,51708390）;天津市交通运输科技发展计划资助项目（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资助项目(18ZXGDGX00050);天津市重点研发计划科技支撑计划重点资助项目（20YFZCSN00520） |
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| Characteristics of Biofilm on Mortar Surface and Its Influence on Mortar Performance in Seawater Environment |
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RONG Hui1, QU Wei1, MA Guowei2, WANG Hailiang3, ZHANG Jinrui4
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1.School of Materials Science and Engineering, Tianjin Chengjian University, Tianjin 300384, China;2.School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China;3.School of Civil Engineering, Tianjin Chengjian University, Tianjin 300384, China;4.State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China
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| Abstract: |
| By means of Fourier transform infrared spectrometer(FTIR), super deep scene microscope, scanning electron microscope(SEM), energy dispersive spectrometer(EDS), X ray diffraction(XRD) and thermal gravimetric analyzer(TG DTG), the characteristics of biofilm formed on mortar surface in seawater environment and its influence on mortar performance were studied. The results showed that sulfur oxidizing bacteria in seawater would adhere to the mortar surface and form a large number of biofilms, which were composed of polysaccharides, proteins and microorganisms. After 15d, the biofilm began to reproduce rapidly. After 75d, the biofilm gradually fell off, and after 90d, the new biofilm reattached. In the process of reproduction and evolution, the biofilm would consume a large amount of oxygen in seawater. By studying the effect of the presence or absence of biofilm on mortar performance, it was found that at 120d, the compressive strength of the biofilm free samples was 525MPa, with a strength growth rate of 038%, and the mineralized products contained a large amount of gypsum. However, the compressive strength of the biofilm free samples was 681MPa, with a strength growth rate of 3172%, and the mineralized products contained a small amount of gypsum. This indicates that the presence of biofilm affects the transmission of corrosive medium in seawater and has a moderating effect on the corrosion of mortar. |
| Key words: mortar biofilm sulfur oxidizing bacteria seawater growth rate of compressive strength |
