Dynamic mechanical behaviour of recycled crumb rubber concrete materials subjected to repeated impact

Abstract

An experimental investigation was conducted on the dynamic mechanical behaviour of crumb rubber concrete materials with crumb rubber contents varying from 0% to 20% (equal volume of fine aggregate replacement) subjected to repeated impacts using a split-Hopkinson pressure bar. The influence of the rubber content on the dynamic properties of crumb rubber concrete, subjected to repeated impacts, was explored. The test results show that the impact resistance time of crumb rubber concrete increases with lower rubber content and then decreases with higher content. Moreover, the static compressive strength of crumb rubber concrete decreases with the increase of rubber content. The capability of energy absorption of crumb rubber concrete under impact loading is higher than that of normal concrete. The incorporation of rubber enhanced the toughness of crumb rubber concrete significantly and the impact resistance of crumb rubber concrete is greatly increased.