Impact response of steel fiber reinforced concrete beams with hooked fibers

Строительные материалы и изделия

The object of research is to investigate the impact response and structural behavior of steel fiber reinforced concrete (SFRC) at varying percentages of fibers by weight of concrete. The impact resistance of plain concrete is low, mainly due to low energy dissipating features and inadequate tensile strength. Steel fibers in concrete mix compensate for the weak tensile properties of conventional concrete. Method. The experimental setup of the impact testing machine is developed to study the impact response of SFRC using a motorized drop hammer on SFRC beam specimens. The average mass of the overall hammer is converted to impact the specimen supported at ends using bolt fixtures. This approach allowed us to evaluate the total strain energy carried by the specimen under impact load. The experimental work also involves testing M20 and M25 concrete grade SFRC cubes under compression using compression testing machine cylinders under split tensile strength test. Results. The results show that as the fiber content increases, the impact strength and the ductility of beams increase. Using fibers enhances all aspects of material capacity, namely compressive strength, split tensile strength, and impact strength.