In the report a series of experiments is presented where solid discs of concrete grout are loaded with plane shock waves. Plane wave generators with high explosives were used for the loading, and registration of stress and times of arrival were made using calibrated piezoelectric stress gauges (PVDF) and piezoelectric pins. Finite element analysis was used to design the experimental set-up. From the experimental results, points on the equation of state for the grout were derived through impedance matching with Lexan. The amplitudes from the gauges, representing the pressure level, were too low due to shortage of the gauges. The grout specimens had been kept in water prior to the experiments to minimize the risk of cracks. The conclusions were that the experimental technique used is suitable for deriving points on the equation of state at pressure levels above 15 GPa.