High strain rate characterization of concrete using split hopkinson pressure bar

Abstract

Dynamic characterization of concrete using 76 mm diameter compressive split Hopkinson pressure bar is carried out in the present study for M20, M25, M30, M35, and M40 grades of concrete. The behavior of concrete at strain rates varying from 241/s to 635/s is investigated. It is observed that the strength of concrete increases with the increase in strain rates. Effect of geometry is considered by incorporating two slenderness ratios of 0.3 and 0.5 for 70 mm diameter specimens. The correlation equations are proposed for computing the DIF (Dynamic Increase Factor) for the M40 grade of concrete considered herein under high strain rates.