Abstract: Microbially-induced calcium carbonate precipitation has been widely used for the surface treatment of all sorts of porous media, for the purpose of improving the durability and extending the service life. By using ureolytic type microorganism, two methods including liquid immersion and agar immobilization were employed for the surface treatment of concrete. After treatment for one week, the capillary water absorption coefficient, water permeation coefficient, and rapid chloride permeation (RCP) of concrete were tested. The contact angle of the surfaces and the thickness of the precipitates were measured. The morphology and composition of the precipitates were comprehensively studied by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD) analyses. Results revealed that the thickness of the microbial precipitated coating layer was about 10 μm. Although the layer precipitated by agar immobilization showed hydrophilicity and was thinner than that by liquid immersion, much denser layer of calcium carbonate was obtained by immobilization method since agar provided favorable microenvironment for the growth of bacteria. Thus, the resistance to permeability of concrete can be effectively enhanced, in particular, the water permeation coefficient was decreased more than 80% by immobilization technique. Meanwhile, agar immobilization has significant values in practical application.
徐晶, 王先志. 浸渍及固载法用于混凝土微生物表面处理对比研究[J]. 材料导报, 2018, 32(24): 4276-4280.
XU Jing, WANG Xianzhi. A Comparison Investigation on the Immersion and Immobilization Methods Applied in the Microbial Surface Treatment for Concrete. Materials Reports, 2018, 32(24): 4276-4280.
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2018, Vol. 32 
