Bacterial concrete: A way to enhance the durability of concrete structures
  Arun K. Chakraborty and Sandip Mondal
  Due to low tensile strength, cracks are common phenomena of concrete, through which transport of harmful substances causes early deterioration of the concrete structure. So, for sustainable development, it is needed to increase the durability of concrete. Self-healing approaches may be regarded as a promising solution to reduce the excessive maintenance cost of concrete structures. This paper presents the crack-healing phenomenon in concrete by the microbial activity of bacteria namely Bacillus Subtilis. The bacteria were directly incorporated in different concentrations in concrete. The results showed that by using the bacteria not only the cracks were healed; the compressive strength of concrete was also improved. The results showed a different healing behaviour depending on the exposure, demonstrating that the presence of water is essential for the healing reactions. The cracks were healed mainly due to the calcite precipitation by the bacterium, which was further confirmed by SEM, EDS and XRD analysis.
 

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