Self-healing of early age cracks in cement-based materials based on mineralization of microorganism

被引：6
|
作者：
Chen H. [1 ,2 ]
Qian C. [1 ,2 ]
Ren L. [1 ,2 ]
机构：
[1] School of Materials Science and Engineering, Southeast University, Nanjing
[2] Research Institute of Green Construction Materials, Southeast University, Nanjing
来源：
Qian, Chunxiang (cxqian@seu.edu.cn) | 1600年 / Southeast University卷 / 46期
关键词：
Cement-based material; Early age; Microorganism; Self-healing;
D O I：
10.3969/j.issn.1001-0505.2016.03.025
中图分类号：
学科分类号：
摘要：
To improve the self-repairing effect of early age cracks in cement-based materials, one type of microorganism which can produce carbonic anhydrase is adopted. The method of water seepage and image processing technology are used to characterize the crack healing efficiency at different crack widths and different cracking ages of cement paste. The mineral composition of deposit sediment in cracks is analyzed by ways of X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersion spectrum (EDS). The CaCO3 precipitated depth in the cracks is also studied by the Photoshop. The experimental results indicate that cracks below 0.5 mm was almost completely closed at early age of 7 d, and the repair ability of microbial self-healing agent was limited for cracks with width between 0.5 and 0.8 mm, and cracks with width up to 0.8 mm was difficult to be repaired. The self-healing agent showed a good repair effect at early age of 7 d, and the longer the cracking age, the more difficult to repair. XRD analysis shows that the precipitant in cracks was calcite calcium carbonat. The depositing depth of CaCO3 in cracks measured by the standard tools of Photoshop decreased with the increase of crack width. © 2016, Editorial Department of Journal of Southeast University. All right reserved.
引用
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页码：606 / 611
页数：5
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