Experimental study of microbial clogging of concrete cracks in sand
LI Meng1, YOU Shiquan1, KANG Shaobin2, CHENG Xiaohui2, GUO Hongxian2
1. Beijing Key Laboratory of Plant Resources Research and Development, School of Sciences, Beijing Technology and Business University, Beijing 100048, China; 2. Department of Civil Engineering, Tsinghua University, Beijing 100084, China
Abstract：Studies on microbial clogging techniques have shown that the provision of sufficient suitable nutrients for the microorganisms in geotechnical soils can produce effective microbial clogging in relatively short periods of time. This study applied various nutrients to two sand columns each with a cracked concrete slab. The tests recorded the ambient temperature and humidity, the pH, electrical conductivity, redox potential, OD600 and the number of different microorganisms. Blocking occurred after various nutrients had been supplied for 25 days. The flow per unit time was significantly reduced with one test slab with potato exact dropping from an average of 85 mL/h to 0.5 mL/h and the other test slab with potato exact and Fe dropping from an average of 70 mL/h to 0.3 mL/h. The tests show that microbial metabolism plays an important role in concrete crack sealing in sand.
李萌, 由士权, 康绍斌, 程晓辉, 郭红仙. 砂土中混凝土裂缝的微生物封堵试验研究[J]. 清华大学学报（自然科学版）, 2019, 59(8): 614-618.
LI Meng, YOU Shiquan, KANG Shaobin, CHENG Xiaohui, GUO Hongxian. Experimental study of microbial clogging of concrete cracks in sand. Journal of Tsinghua University(Science and Technology), 2019, 59(8): 614-618.
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