| 摘要: |
| 利用琼脂作为菌株的载体，将菌株和营养物质牢固固载于水泥石表面，对其进行修复防护.对菌株固载包埋量、载体含量、修复涂刷液黏度以及固载尿素（urea）与Ca2+浓度等配比参数进行了优化，并采用乙酸涂抹法在试件表面缺陷处游离出微量Ca2+，用以增强覆膜层与表层之间胶结能力.结果表明：琼脂固载菌株涂刷3d后可在水泥石表面原位矿化沉积出厚度为100μm的方解石层，修复后水泥石试件毛细吸水系数较修复前降低90%以上，修复效果显著. |
| 关键词: 微生物 矿化 修复 方解石 固载 琼脂 水泥基材料 缺陷 |
| DOI：103969/j.issn1007 9629201306004 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（2012 51202029）；江苏省自然科学基金资助项目（2010 BK2010418） |
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| Restoration of Defects on Cement Based Materials Surface byBacteria Immobilized in Agar |
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WANG Rui xing, QIAN Chun xiang
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College of Materials Science and Engineering, Southeast University, Nanjing 211189, China
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| Abstract: |
| Defects on cement based materials surface can be repaired by using agar as the carrier of bacterial strain. The matching parameters of embedded quantity and carrier content of immobilized bacterial strain and repairing and brushing solution viscosity as well as concentration of immobilized urea/Ca2+ were optimized. The microscale Ca2+ at the defects on the surface of test specimen by adopting acetic acid smear method was disassociated to enhance the cementing power between calcite layer and surface of hardened cement paste with the result that the 100μm thick calcite layer can be mineralized and deposited in situ on the surface of hardened cement paste within three days. The gross absorption coefficient of the repaired hardened cement paste test specimen reduced by more than 90% compared to that before reparation. |
| Key words: bacteria mineralization restoration calcite immobilized agar cement based material defect |
