Experimental investigation on dynamic properties of rubberized concrete

Damping ratio is the main parameter representing the property of materials in vibration reduction. In this study, simply supported beams were tested using a free vibration method to determine the relationships between damping ratio in small deformation and the size as well as amount of rubber particles in rubberized concrete. Elastic wave method and beam element method were used to test the dynamic modulus of rubberized concrete. A comparison between the static modulus and the dynamic modulus was also conducted. It was observed that the damping ratios of rubberized concrete improved considerably compared to those of normal concrete. The dynamic modulus elasticity of rubberized concrete was lower than that of normal concrete. The crushed rubberized concrete had better damping properties but lower dynamic and static modulus of elasticity than ground rubberized concrete. The results of the study provide valuable information for a better understanding of dynamic properties of rubberized concrete.