ABSTRACT
In the Federal Republic of Germany base course layers with hydraulic binders are used in pavements under certain conditions. In addition to stabilizations, a distinction is made between hydraulically bound base course layers and concrete base. If stabilizations or hydraulically bound base course layers are arranged under asphalt base, a hybrid construction is formed. The different material properties, as well as construction-specific peculiarities result in particular stress conditions. Little has been known about their effects on the dimensioning of the pavement until now. The present paper highlights the basic principles for the detection of these stresses. Based on a structural model, the influence of different crack distances as well as temperature-induced longitudinal strains of the hydraulically bonded support layer (HGT) on the stress state of the pavement, in particular the asphalt base, is investigated numerically. For the calculation of the thermal conditions in the pavement a specially developed numerical model at the Chair of Pavement Engineering (TUD) has been used. As a result, the influence of the investigated phenomena on the dimensioning of asphalt pavements is compared to the status quo.
