ABSTRACT
At present, there are mainly two methods to determine materials’ spalling strength by using Hopkinson devices: one is named as spalling block velocity method, and the other one is called pullback velocity method. Klepaczko and Brara (Li 2008) Wu et al. (Klepaczko et al. 2001, Wu et al. 2005) got the falling speed of spalling blocks by using the high-speed camera, and then calculated the dynamic tensile strength of specimens through the falling speed of spalling block. Schuler (Schuler et al. 2006) determined the spalling strength of concrete by the method of pull back velocity. However, there are a few limitations about the two methods; for example, additional speed testing devices are needed besides the regular Hopkinson devices.
