Validation of national empirical pavement design approaches for cold recycled asphalt bases

The applied pavement design procedures differ from country to country within Europe. Especially the use of cold recycling materials which is handled similar to hotmix asphalt (HMA) in the most available guidelines isn’t sufficient researched. To verify developed procedures, practical trial sections are indispensable. Within this study cold recycled asphalt base layers (CRAB) were assessed according to the German procedure for monitoring and evaluation of road surface conditions. It can be concluded, that the general applied empirical design approach, in which the CRAB layer thickness is increased by 50% compared to a HMA base will result in a feasible pavement structure. In general, the redesigning of the sections according to various national empirical pavement design approaches partly results in high differences for same layer types