Effect of Bacillus Subtilis on Concrete with Steel Fibers and Fly Ash

  IJETT-book-cover  International Journal of Engineering Trends and Technology (IJETT)          
  
© 2019 by IJETT Journal
Volume-67 Issue-7
Year of Publication : 2019
Authors : Vijaya Laxmi Govindugari , Srinivas Reddy P , Madhavi Latha D , Sandeep Reddy A
DOI :  10.14445/22315381/IJETT-V67I7P202

Citation 

MLA Style: Vijaya Laxmi Govindugari , Srinivas Reddy P , Madhavi Latha D , Sandeep Reddy A"Effect of Bacillus Subtilis on Concrete with Steel Fibers and Fly Ash" International Journal of Engineering Trends and Technology 67.7 (2019): 5-10.

APA Style:Vijaya Laxmi Govindugari , Srinivas Reddy P , Madhavi Latha D , Sandeep Reddy A(2019). Effect of Bacillus Subtilis on Concrete with Steel Fibers and Fly AshInternational Journal of Engineering Trends and Technology, 67(7), 5-10.

Abstract
Over more than a decade, microbially induced carbonate precipitation is in use to increase mechanical properties of concrete. The use of self protected bioconcrete has become a topic of thrust area of research worldwide, especially employing bacterial strains. Concrete has an ultimate load bearing capacity under compression but the material is weak in tension. The steel reinforcement have the capacity to take the tensile load, while the concrete cracks under tension. On the other hand, the concrete protects the steel reinforcement from the environment and prevents corrosion. However, the cracks in the concrete cause a major problem which affects the durability of the structures. Here the ingress of water and chloride ions takes place and deterioration of the structure starts with the corrosion of the steel. The conventional methods to increase the strength and durability of the structure and seal the cracks formed in the structure, epoxy injections or latex treatment are used. Unfortunately, the chemicals used in these treatments are expensive and cannot reach the deeper portions of the cracks in the structure. Hence, the present study was aimed to attempt a self healing concrete with increased durability and tensile strength using steel fibres and fly ash. M-30 grade concrete has been tested in the present study with various concentrations of fly ash and steel fibre (1.5%) along with and without bacteria i.e. Bacillus subtilis, to evaluate various mechanical properties of the concrete mix. Concrete mix with bacterial concentration of 1x105 cells per ml. along with 1.5% steel fibre and 20% fly ash was found to show more split tensile and compressive strength (50.13 MPa.) compared to mix without bacterial cells (45.50 MPa) after 28 days of curing. Mix with 1x105 cells/ml bacteria, 1.5%steel fiber and 0% fly ash has less weight loss and strength loss compared to other mix grades devoid of bacteria

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Keywords
Concrete, Self healing, Fiber, Fly Ash, Bacillus subtilis, Mechanical properties.