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.
[1] DEJONG J T, SOGA K, KAVAZANJIAN E, et al. Biogeochemical processes and geotechnical applications:Progress, opportunities and challenges[J]. Geotechnique, 2013, 63(4):287-301. [2] GUO H X, CHENG X H, LI M. Experimental analysis of bio-stimulated sealing process in environmental geotechnical engineering[J]. Science China Technological Sciences, 2013, 56(3):732-738. [3] MITCHELL J K, SANTAMARINA J C. Biological considerations in geotechnical engineering[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2005, 131(10):1222-1233. [4] UMAR M, KASSIM K A, PING CHIET K T. Biological process of soil improvement in civil engineering:A review[J]. Journal of Rock Mechanics and Geotechnical Engineering, 2016, 8(5):767-774. [5] LESLEY K, KENT N, JULIANA R. Biostimulation of groundwater microorganisms in fractured bedrock through nutrient addition:A field trial[C]//Proceedings of 1st International Conference on BGCE. Delft, Netherlands:Delft University of Technology, 2008:67-75. [6] 张越, 郭红仙, 程晓辉, 等. 微生物诱导碳酸钙沉积技术治理某地下室渗漏的现场试验[J]. 工业建筑, 2013, 43(12):138-143. ZHANG Y, GUO H X, CHENG X H, et al. Field experiment of microbial induced carbonate precipitation technology in leakage treatment of a basement[J]. Industrial Construction, 2013, 43(12):138-143. (in Chinese) [7] 李萌, 郭红仙, 程晓辉, 等. 自源型微生物在地基渗漏封堵过程中的群落变化分析[J]. 工业建筑, 2015, 45(7):13-18. LI M, GUO H X, CHENG X H, et al. Analysis of the changes of microbial communities in process of biosealing grounds[J]. Industrial Construction, 2015, 45(7):13-18. (in Chinese) [8] IVANOV V, CHU J. Applications of microorganisms to geotechnical engineering for bioclogging and biocementation of soil in situ[J]. Reviews in Environmental Science and Bio/Technology, 2008, 7(2):139-153. [9] 张贺超, 郭红仙, 李萌, 等. 砂土介质中微生物诱导封堵试验研究[J]. 工业建筑, 2015, 45(1):139-142. ZHANG H C, GUO H X, LI M, et al. Experimental research of microbial-induced clogging in sands[J]. Industrial Construction, 2015, 45(1):139-142. (in Chinese) [10] SEIFERT D, ENGESGAARD P. Sand box experiments with bioclogging of porous media:Hydraulic conductivity reductions[J]. Journal of Contaminant Hydrology, 2012, 136-137:1-9. [11] 中华人民共和国住房和城乡建设部. 地下防水工程质量验收规范:GB 50208-2011[S]. 北京:中国建筑工业出版社, 2011. Ministry of Housing and Urban-Rural Development of the People's Republic of China. Code for acceptance of construction quality of underground waterproof:GB 50208-2011[S]. Beijing:China Architecture & Building Press, 2011. (in Chinese) [12] THULLNER M. Comparison of bioclogging effects in saturated porous media within one-and two-dimensional flow systems[J]. Ecological Engineering, 2010, 36(2):176-196. [13] ACHAL V, MUKHERJEE A. A review of microbial precipitation for sustainable construction[J]. Construction and Building Materials, 2015, 93:1224-1235. [14] FRANCISCA F M, GLATSTEIN D A. Long term hydraulic conductivity of compacted soils permeated with landfill leachate[J]. Applied Clay Science, 2010, 49(3):187-193.
2019, Vol. 59 
