• K N RUKMINI FLORENCE
• C V S NAGENDRA

To improve mechanical and durability properties of concrete, the present investigation is to measure the strength and durability characteristics of the concrete by partial replacement of cement with silica fume which is a by-product ofsilicon metal or ferrosilicon alloys. In addition to silica fume, bacterial solution is added to the concrete which helps to heal the cracks by spraying of water and this type of concrete containing bacteria is also known as Bacterial concrete. In this present study cement mortar cubes are casted to determine the exact percentage of silica fume to be added to improve mechanical strength of concrete approximately among 0%, 5%, 10%, 15% and 20% percentages. Certain constant percentage of silica fume is considered and is partially replaced in cement for all mixes of concrete using bacteria subtilis(ml/litres) with different quantities like 5ml, 10ml and 15ml. The various physical and mechanical properties like compressive strength, split tensile strength and also durability properties are studied which consists of Acid attack, alkaline attack and water absorption test for M20 grade of concrete mix. This study was to investigate the quantity usage of bacteria with the combination of constant percentage of silica fume which improves properties of concrete.

Silica Fume (SF), Compressive strength, Split tensile strength, Durability, Bacteria subtilis

"INFLUENCE OF SILICAFUME AND BACTERIA ON PROPERTIES OF CONCRETE", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.481-487, June 2019, Available :http://www.jetir.org/papers/JETIR1906V68.pdf

"INFLUENCE OF SILICAFUME AND BACTERIA ON PROPERTIES OF CONCRETE", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp481-487, June 2019, Available at : http://www.jetir.org/papers/JETIR1906V68.pdf