Concrete durability is the function of its internal pore structure, porosity and the permeation properties. Improved pore
structure, reduced porosity and enhanced permeation properties lead to the durability of structures. The objective of the
present paper is to discuss the biological approach to enhance durability in concrete structures. Research has shown that specific
species of alkaliphilic bacteria can be used to repair cracks in already existing concrete structures. A novel eco friendly self
healing technique called ?Biocalcification? is one such approach on which studies were carried out to investigate the crack healing
mechanism to study the enhancement of durability in concrete. Microbiologically induced calcite precipitation (MICP), a highly
impermeable calcite layer formed over the surface of an already existing concrete layer, due to microbial activities of the bacteria
Bacillus subtilis JC3 (cultured at JNTU) seals the cracks in the concrete structure and also has excellent resistance to corrosion
therefore increases the durability of concrete structures. MICP is a complex mechanism and is a function of cell concentration,
ionic strength, nutrient and pH of the medium. This paper aims to reports the investigations on the enhancement of durability
by microbiologically induced calcite mineral precipitation (MICP) in ordinary (M20) and standard (M40) grades of concrete.
Quantification and Characterization was done using Scanning Electron Micrograph (SEM) analysis, only to be noted that cracks
were sealed up by crystalline material grown over the surface due to microbial activity of the bacteria.
V Srinivasa Reddy is a Research Scholar at Jawaharlal Nehru Technological University College of Engineering, Hyderabad, India.
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