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Bio cement - A new approach for healing cracks in concrete structures

Ravindranatha, . and Suhas, S and Udaya Kumar, K S (2015) Bio cement - A new approach for healing cracks in concrete structures. LAMBERT, Berlin GermanY. ISBN 978-3-659-79833-7

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Abstract

Concrete is widely used in construction industry. Some of its major drawbacks are cracking, and seepage. Cracks form an open pathway to the reinforcement and can lead to durability problems like corrosion of the steel bars. These cracks should be repaired because they can reduce the shelf life of the structure. The application of synthetic chemicals currently used for concrete repair is a source of environmental concern; therefore the use of a biological repair technique is investigated in this study. The tensile characteristics of concrete are improved using microorganisms and the process is known as Bio cementation. In this process, ureolytic bacteria such as Bacillus aerophilus are able to precipitate calcium carbonate in their micro-environment by conversion of urea into ammonium and carbonate. Calcium carbonate/ calcite is precipitated as an extracellular product filling up the internal pores and cracks in the concrete structure. Concrete mix was generated using 43 grade Ordinary Portland cement (OPC) and for laboratory testing, M30 concrete was adopted. Compressive, split and flexural tensile tests were performed on the concrete cubes, cylinders and beams as per Indian standards (IS) specifications. The test results confirmed the superiority of bacterial over normal concrete. X-ray diffraction (XRD) studies confirmed calcite prepcipitation due to ureolytic activity of Bacillus aerophilus.

Item Type: Book
Subjects: Engineering > MIT Manipal > Civil Engineering
Depositing User: MIT Library
Date Deposited: 26 Mar 2016 15:25
Last Modified: 26 Mar 2016 15:25
URI: http://eprints.manipal.edu/id/eprint/145664

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