Compressive behavior of rubberized concrete under high strain rates

Rubberized concrete (RuC) is an eco-friendly material with better impact resistance than normal concrete. A comprehensive understanding of RuC's dynamic compressive behavior is essential for its application in antiimpact related elements. In this paper, split Hopkinson pressure bar (SHPB) tests were conducted to study the rubberized self-compacting concrete's (RuSCC, which is one kind of RuC) dynamic compressive properties. The experimental results show that the DIF of RuSCC with 80% coarse aggregate replaced is 70% and 93% higher than self-compacting concrete (SCC) at strain rates of 120 s  1 and 160 s  1, respectively. The dynamic increase factor (DIF) of RuSCC with fine aggregate replaced is also larger than that of RuSCC with coarse aggregate replaced. To further study the DIF relationship of RuC, a database is built by gathering the results of this paper and 13 previous studies. A prediction model of RuC's DIF relationship is then proposed and validated based on the database. The database indicates that normal concrete's DIF values are higher than RuC when the static strength and strain rate are the same. Moreover, the predicted DIF values show that the difference between the strain rate effects of rubberized normal concrete (RuNC) and RuSCC is negligible.