Browsing by Author "Sandhya, MG"

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    A Study on Bacterial Concrete
    (2018-06-21T07:28:31Z) Sandhya, MG; Radhika, S; Savitha, R
    Concrete is a construction material that is used world-wide because of its first-rate properties. However, the drawback of this material is that it easily cracks due to its low tensile strength. It is a well-known fact that concrete structures are very susceptible to cracking which allows chemicals and water to enter and degrade the concrete, reducing the performance of the structure and also requires expensive maintenance in the form of repairs. In this paper, the following notable points regarding classification of bacteria, selfhealing of cracks in concrete, chemical process for crack remediation, self-healing mechanism of bacteria, application of bacteria in construction field, Advantages and disadvantages of bacterial concrete etc., are observed and identified from the other research works. Cracking in the surface layer of concrete mainly reduces its durability, since cracks are responsible for the transport of liquids and gases that could potentially contain deleterious substances. On the other hand the concrete structures show some selfhealing capacity, i.e. the ability to heal or seal freshly formed micro-cracks. When micro-cracks growth reaches the reinforcement, not only the concrete itself may be damaged, but also corrosion occurs in the reinforcement due to exposure to water and oxygen, and possibly CO2 and chlorides too. Self-healing of concrete can be done by many ways such as application of specific calcite precipitating bacteria for concrete repair, usage of synthetic polymers such as epoxy treatment, biomineralization of bacteria in concrete etc.,