Investigation on the Dynamic Mechanical Properties of Thermally Treated Rubberized Self-compacting Concrete Under Repeated Impact

Concrete structures often fail under multiple impacts in their service life. Therefore, the repeated impacts test was conducted by split Hopkinson pressure bar (SHPB) to investigated the dynamic behavior of RSCC under the repeated impacts. RSCC with three different rubber content, respectively 10%, 20%, and 30%, was prepared to investigate the effects of rubber content and high temperature. A group of NSCC was prepared as the control group. The experimental results demonstrate that the thermal treatment of 150 ℃ has a little effect on the repeated impacts behavior. A similar behavior of RSCC to NSCC is noted. The incorporation of rubber modifies the brittleness of NSCC. It decreases the peak stress generated in the specimen. With the increase of rubber content, an increasing trend in the repeated impact number is observed. RSCC shows better resistance to the repeated impacts than NSCC. After the thermal treatment of 300 ℃, the peak stress of NSCC increases, but NSCC still shows a brittle failure mode. However, the peak stress and the total repeated impact number of RSCC decreases. RSCC shows a deteriorating resistance to the repeated impacts with the increase of the temperature and deteriorates a lot with the increase of rubber content. Furthermore, at room temperature and the temperature of 150 ℃, RSCC shows a higher total specific energy absorption (SEA) than NSCC, but NSCC shows a higher total SEA than RSCC at 300 ℃. © 2023 Editorial Department of Journal of Sichuan University. All rights reserved.