Effect of bacteria subtilis on e-waste concrete

Concrete is considered to be the greatest consumers of natural resources, which forms dominant material in the construction Industry. Concrete possess very low tensile strength and it cracks under uninterrupted loading. Due to destructive environmental agents, life of the structure is conclusively reduced which were constructed using concrete materials. This type of damage is caused beforehand of the building structures life and also in due course of time. Epoxy injection methods are used to countermeasure this problem of formation of cracks. But they are not agreeable. Therefore, a different and eco-friendly method of crack arresting called Microbiologically Induced Calcium Carbonate (calcite) Precipitation has been proposed to improve the strength of construction materials. In this paper the issues of environmental concern were addressed and the use of E-waste as a substitution for coarse aggregate was planned to attempt. M30 grade of concrete mix design was adopted. E-waste in the range of 0%, 5%, 10%, 15% and 20% to that of coarse aggregate has been substituted. Percentage of microorganism varies as 1% & 2% of the cement content. Finally, the mechanical properties of concrete mix are obtained and compared with control concrete mix. Remarkable improvements in strength properties were reported. (C) 2020 Elsevier Ltd. All rights reserved.