Effects of Macro-Synthetic Fibres Incorporation on the Dimensional Change Properties of Bacillus Subtilis Bacterial Concrete

Document Type : Research Papers

Authors

1 Ph.D., Instructor, Structural Engineering Department, Faculty of Engineering, Zagazig University, Egypt.

2 Professor, Structural Engineering Department, Faculty of Engineering, Zagazig University, Egypt.

Abstract

Immediate dimensional changes during loading are critical characteristics that must be thoroughly understood to ensure the long-term durability and performance of concrete. In the current study, the effects of fixed bacterial content and different macro-synthetic fibre mechanical properties and fibre percentages on concrete dimensional changes were evaluated using 34 mixed designs. The influence of low- and high-strength macro-synthetic fibre with nine contents ranging from 0% to 4% on M40 concrete was investigated with and without calcium carbonate precipitation of Bacillus subtilis activity at a cell concentration of 105 cells/ml. The ANSYS package was used to compute the homogenized properties of the composite materials, such as the elastic modulus, shear modulus, and Poisson's ratio. For validation, the numerical results showed good agreement with the analytical results of the dilute distribution model and the Mori-Tanaka model. Compared to the reference conventional concrete, the results showed that adding bacteria and 2% high-strength macro-synthetic fibre simultaneously improved elasticity, shear moduli, and Poisson's ratio by 17.89%, 15.16%, and 3.30%; however, low-strength macro-synthetic fibres caused 3.54%, 1.32%, and 2.98% reduction, respectively. Overall, high-strength macro-synthetic fibre improves the properties of bacterial concrete composite for a variety of structural applications when compared to other traditional concrete.

Keywords


 
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