A Study on Performance of Standard Grade Bacterial Concrete with Fly Ash

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IJERTV10IS120199
A Study on Performance of Standard Grade Bacterial Concrete with Fly Ash

Dr. Ravande Kishore , P. Srinivas Reddy , Dr. G. Vijaya Laxmi

Concrete is prone to micro crack formation which is undesirable because they provide an open pathway for the ingress of water and other deleterious substances. Main reason to prevent cracks or limit crack width is to enhance the durability of the structure. Concrete surface treatments with water proofing materials to prevent the access of aggressive substances are a common way to repair concrete structures. These cracks should be repaired to increase the strength and durability of the structure, using either epoxy injections or latex treatment. However, the most common surface treatments include using organic polymers (epoxy, acrylics andpolyurethanes). The characteristics of pore structure of concrete have a direct influence on its durability. One way to avoid costly manual maintenance and repair is to incorporate an autonomous self-healing mechanism in concrete. One such alternative repair mechanism, i.e. a novel technique based on the application of bio mineralization of bacteria in concrete. The bacteria present in the concrete rapidly fill cracks through calcite production. The search for new environmental friendly construction materials like fly ash which can improve the strength and durability of concrete structures has developed interest in self healing bacterial concrete with Fly Ash. The present experimental investigation is carried out to study the mechanical and durability properties of M40 grade concrete using Sporosarcina Pasteurii which would make it, self-healing. The bacterial concentrations were varied by 105, 106 and 107cells/ml. The percentage replacement of fly ash used were 0%, 10%, 20% and 30% by mass of cement. The experiments were carried out to evaluate the effect of Sporosarcina Pasteurii on the compressive strength, split tensile strength, flexural strength, strength loss and weight loss at 7, 28, 56 and 90 days. The test results indicated that inclusion of Sporosarcina Pasteurii with mix 1×106 cells/ml bacteria and 20% fly ash gives optimum performance in terms of compressive strength, split tensile and the mix with 1×107 cells/ml bacteria and 30% fly ash gives optimum performance in terms of strength loss and weight loss and acid durability factor.