Two investigations that were part of the project Structural protection for stationary/mobile tactical behaviour during 2002 are here summarized material testing and numerical simulations. Material testing. Experiments on concrete grout specimens subjected to plane shock waves have been performed. Plane wave generators with high explosives were used and registrations of stress and time of arrival were made. Some points on the equation of state for the grout were derived through impedance matching with Lexan. However, the presence of free pore water may have influenced the results. The experimental technique evaluated is suitable for pressure levels above 15 GPa. Numerical simulations. Results from numerical simulations of a steel projectile penetrating a concrete target are discussed. The simulations are performed with the Autodyn software in 2D and 3D with the use of the RHT material model. This advanced material model incorporates elastic limit, failure and also residual strength of the crushed concrete under pressure. A study of the parameters in the RHT model is performed. An advantage with 3D simulations is that more realistic penetration cases with oblique impact can be done. However, 3D simulations lead to a large number of elements and thus also to long calculation times. Therefore a parallel processor system has been tested.