A number of semi-rigid pavements constructed in the 1970’ies in Denmark have shown superior performance, with limited reflective cracking and long life of the wearing courses. With this experience as background, an incremental-recursive deterioration model has been set up for cement bound base materials. The model was calibrated with data from full-scale test sections loaded with a Heavy Vehicle Simulator and further validated with data from the Danish motorway sections. Laboratory tests were performed in order to investigate the effect of various mix design parameters for cement bound mixtures.