The shock properties of C30 concrete with initial porosity is investigated by gas gun planar impact technique. The manganin pressure gauge is used to measure the pressure-time curves of the samples. It is shown by the experimental studies on the shock Hugoniot relationship and the Grüneisen-type equation of state for C30 concrete that the D-u shock Hugoniot relationship is described by the linear relation, and the material parameters in the Grüneisen-type equation of state are determined. Moreover, it is observed from the measured pressure-time curves that the rate-sensitivity of dynamic response for C30 concrete is not negligible, showing marked stress relaxation and dissipation.