Mechanical and Durability Properties of Microbially Induced Calcite Precipitated Polypropylene Fibre Reinforced Concrete

In fibre reinforced cementitious composites (FRCC) bonding between the fibres and matrix governs many important properties, which includes strengths, fracture energy, ductility, and energy absorption capacities. The study explores the application of a microbially induced calcite precipitation (MICP) to pre-treating surface of polypropylene (PP) fibres for enhancing the interfacial boning strength. The technique utilizes MICP process to produce calcium carbonate that binds onto the fibre surface, leading to increased interfacial bond area and strength. Laboratory tests indicate that MICP modification could increase the mechanical and durability properties of concrete. Tests on hardened concrete to analyse the mechanical properties was done as per IS 516-1959. A durability study was also done as per ASTM standards to analyse the behavior of the developed concrete under adverse weather conditions. Results acknowledged an important role of MICP pre-treatment in enhancing both the mechanical and durability performance of concrete.