Experimental Study On Bacterial Concrete And The Influence Of Various Concentrations Of Bacteria On The Properties Of Concrete

Abstract

 It is well known that concrete is good in compression but it cannot take tensile loads for which the reinforcement is provided. The main disadvantage of concrete is that they undergo cracking over a period of time and these cracks get widened subsequently which reduces the load carrying capacity of the structures. However there are many techniques in increasing the load carrying capacity of the structure. But in this present study, addition of Bacillus subtili in various concentrations has implemented which is eco friendly and also helps in enhancing the load carrying capacity of the structure. A comparative experimental study is done for the conventional concrete and the bacterial concrete with various concentrations of bacteria. The bacterial concrete is prepared with manufactured sand and without manufactured sand. For this, a mix design of M20 is adopted. Specimens such as cubes, cylinders and beams are casted and cured for 28 days in water. The cubes and cylinders are tested in compression testing machine for compressive strength and split tensile strength respectively whereas the beams are tested in the loading frame for flexural strength. From these tests, graphs has been plotted for compression strength, split tensile strength and flexural strength for both conventional concrete as well as bacterial concrete with and without manufactured sand. From the results obtained, it can be concluded that bacterial concrete of 6ml/ liter concentration with the manufactured sand has performed well than the other concentrations and the conventional concrete.