BEHAVIOUR OF HYBRID FERRO FIBER CONCRETE (HFFC) UNDER AXIAL COMPRESSION

Abstract

The combination offiber reinforced concrele andferrocement can be usecl in developing a concrete composite with large ductility, which is required in structures subjecled to seismic forces'. Such a concrete composite can be ternred as HYBRID FERRO FIBER CONCRETE HFFO. Thi,s paper presents an experimental investigalion on the behavior of HFFC under axial compression. The parameters varied include (l) Specific surfacefactor (S) offerrocetnent sltellwhich influences the behavior offerrocement, (2) Reinforcing index (RI) of iteelfiber concrete which influences the behavior of FRC. One hundred and sixty eight prism specimens of .size I 50mm x I 50mnt x 300mnt were tested under .strain-controlled rate of loading. The results indicated that lhe combinetl use o-f ferrocement and fibers in Hybrid ferro fiber concrete has improved the ultimate strength; strain at ultintate strength and the ductility. The improvement is proportional to the specific sttrface Jactor (S) offerrocemenl shell for a given confinement index (C) of lateral reinforcement and reinforcinSy index (RI) of steelfiber reinforced concrete.