| Concrete is the most widely used man-made material in the world and is second only to water in terms of its utilization. Annually, 6 billion tons of concrete is produced in the world and the US consumption of concrete is over 2.5 tons a year per person (SDC Vision 2030 – US Concrete Industry). It drives a US;Keeping the above points in mind, the present study focused on developing a high performance fiber reinforced concrete (HPFRC) material with very high strength and improved ductility, which can rehabilitate the structure by repairing it at a fraction of replacement cost required for new construction.;All the materials used in this study are commercially available in the United States. Initially two HPFRC mixtures were developed using portland cement, two types of fine sand with optimized grading, ultrafine quartz powder, discontinuous steel fibers, and a next generation polycarboxylate-based full range water reducing admixture. The water to cementitious materials ratio and the fiber volume fraction were kept at 0.2 and 2%, respectively. To study the effect of curing temperature on the hardened properties of the mixtures, four different curing conditions were selected. Compressive strength, flexural strength, and flexural toughness were determined for those eight combinations. Compared to high performance fiber reinforced cement composites (HPFRCC) the increase in compressive strength was in the range of 25-105%. Flexural strength was found to be similar to that of HPFRCC. Based on these strength results, the better performing mixture and the two best performing curing conditions were further selected to study the bond behavior of HPFRC to NC.;The bond strength was determined by conducting three tests, such as, direct shear, slant shear, and pull-off. The results showed comparable bond strength in case of direct shear and 20% increase in bond strength by slant shear, when compared with other similar studies. The pull-off strength exceeded the minimum acceptance criterion for bond strength of repairing materials per International Concrete Repair Institute – Technical Guidelines. |
