Investigation of Self Compacting M20 Grade Bacterial Composite Concrete made of Steel Fiber reinforcement for its Compressive Strength

Abstract

Aim: The aim of the study is to Increase the compressive strength of concrete by adding steel fiber to the concrete and to quantify the compressive strength of steel fiber reinforced self compacting M20 grade bacterial concrete using a novel Microbial Induced Calcite Precipitation (MICP) technique. Novel MICP is a biological process in which calcite calcium carbonate (CaCO₃) formation is achieved as a result of the active metabolism of bacteria.Materials and Methods: A total of 36 samples were prepared for this study in which 18 samples per group. one group with fiber, another group without fiber. The fiber is like steel fiber. Bacillus subtilis bacteria was prepared using novel MICP technique in the Microbiology laboratory using a mother strain brought from the hi-media labs. Using SPSS software version 21, an independent sample T-test was performed, revealing a clear increase in the compressive strength of the steel fiber reinforced self compacting bacterial concrete compared to self compacting bacterial concrete. Results: The mean compressive strength of steel fiber reinforced self compacting M20 grade bacterial concrete was 41.9906N/mm² and the compressive strength of self compacting bacterial concrete without fiber was 27.5827N/mm² using novel MICP technique. Independent sample t-test was performed to analyse the results. Standard deviation for steel fibre reinforced bacterial concrete was 3.07205  Significance of the events was p=0.061 (p>0.05). Conclusion: The polypropylene fiber reinforced self compacting concrete had more strength compared to bacterial concrete without fibers using novel MICP technique. When compared to bacterial concrete, the polypropylene fiber compressive strength increased by 52.3%.