Investigation on the dynamic compressive behavior of waste tires rubber-modified self-compacting concrete under multiple impacts loading

The rubberized self-compacting concrete (RSCC) combines the better ductility and toughness of rubber aggregates and the better working performance of self-compacting concrete (SCC), and has gained popularity. In practice, concrete structures often suffer multiple impacts loading during their service life. Therefore, this work investigates the dynamic compressive properties of RSCC under multiple impacts loading by the split Hopkinson bar technique (SHPB) and takes the influences of rubber content, impact velocity, and thermally treated temperature into consideration. The results indicate that the incorporation of rubber aggregate gives the SCC better ductility and toughness, especially by a rubber content of 20%. The resistance to multiple impacts loading, the resistance to deformation, and the ability to absorb energy are all enhanced by the rubber aggregates. Furthermore, the thermal treatment shows a slight strengthening effect on the dynamic resistance of SCC but SCC still maintain its characteristic of brittleness. The thermal treatment shows a significant attenuation effect on the dynamic response of RSCC.