Bacteria for Concrete Surface Treatment - Biotechnologies and Biomimetics for Civil Engineering - page 348

photosynthesis, sulfate reduction, and urea hydrolysis. Even the effect of bacteria
on various parameters in concrete proves to be beneficial development. Based on
the studied properties like compressive strength, permeability, water absorption,
chloride ingression, the microbial mineral precipitation appears to be a promising
technique at this state of development.
These promising results of surface treatment by biodeposition for the
improvement of the durability of concrete materials and structures have drawn the
attention of research groups all over the world. However, so far, no data have
described a sufficient degree toward enhancement in the durability of building
structures by biodeposition. Hence, a lot of research is still necessary before such
technology is ready for applications in civil engineering. Moreover, long-term
effect of biodeposition surface treatment is not yet reported. However, the
important parameter such as permeation properties was not dealt with. As bio-
deposition fills the subsurface pores, the extent of permeability reduction must be
studied in detail. The efficiency of biodeposition in resisting carbonation and
reduction in permeability to improve the corrosion resistance must be studied in
detail. Most of the studies based on biodeposition were conducted to evaluate
compressive strength, water absorption, and crack remediation of mortars and
concretes. The effects of biodeposition on reducing the corrosion rate of reinforced
concretes have not been studied in detail and needed to further research efforts.
Acknowledgment Financial supports from Natural Science Foundation of China (No.
51008281), the China postdoctoral science Foundation (No. 2012M510119), and National Basic
Research Program of China (No. 2009CB623200) are gratefully appreciated.
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