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Effect of Bacteria on the Properties of Fly Ash Concrete

Author(s):

Umesh Adhikrao Dhotre , Adarsh Institute of Technology and Research Centre, Vita; Chandrahas Bhimrao Patil, Adarsh Institute of Technology and Research Centre, Vita; Mosin Sherekhuda Shikalgar, Adarsh Institute of Technology and Research Centre, Vita

Keywords:

Bacillus pasteurii, Bacterial concrete, Fly ash, water absorption

Abstract

Today the application of concrete is rapidly increasing worldwide; it is already the most used manmade material in the world as it is relatively cheap and its basic ingredients (sand/ gravel/ water) are readily available. However, the development of a sustainable concrete is urgently needed for environmental reasons. It is clear that cement, the key binder ingredient in concrete has a high environmental impact. Presently about 10% of the total anthropogenic CO2 is due to the cement production solely. Today innovation is leadingly being inspired by nature as a sustainable alternative. Hence, taking notes from biotechnology, investigation is being conducted to create concrete the way nature does with microorganisms. The objective here is to study the application of bacterial species i.e. Bacillus Pasteuri to improve the strength of fly ash concrete. The dormant but viable bacteria in the concrete matrix will contribute to the strength of the concrete. Water which enters the concrete will activate the dormant bacteria which in turn will give strength to the concrete through the process of metabolically mediated calcium carbonate precipitation. The spore forming Bacillus Pasteuri may be able to survive in this artificial environment and increase the strength and durability of cement concrete. We found that incorporation of this bacteria will not negatively affect the compressive and split tensile strength of the cement concrete instead induce the precipitation of calcite. Microbial Induced Calcite Precipitation is highly desirable because the calcite precipitation induced as a result of microbial activities, is pollution free and natural. Microbial calcite precipitation was visualized by Scanning Electron Microscope. The unique imaging and microanalysis capabilities of SEM established the presence of calcite precipitation inside cracks, bacterial impressions and a new calcite layer on the surface of concrete.

Other Details

Paper ID: IJSRDV4I90474
Published in: Volume : 4, Issue : 9
Publication Date: 01/12/2016
Page(s): 852-858

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