Enhancement of multi-scale-multi-phase approaches as basis for considerations of long-term behavior of roads

点击翻译按钮获取中文摘要

Besides structural substance of road pavements and their typical deterioration mechanisms as cracking and deformation, surface properties and related functional properties has to be considered in terms of durability. Functional properties with relevance to road safety for the users are - amongst others - skid resistance and drainage. That is why methods and models dealing with the long-term behavior of that properties and the related changes concerning the structure and the surface of roads (deformations, changes of macro- and microtexture) will be evaluated in cooperation with other subprojects of the research group.The 3D-drainage model developed in the first project phase will be enhanced for the simulation of the long-term behavior of drainage as functional property. Plastic deformations (simulations of TP1, experiments of TP4) as well as changes of macro-texture characteristics will be considered to simulate their impact on water runoff and water film depths in a systematic way.The hysteresis model developed by the ISV for the simulation of the microtextural contribution to the phenomenon of skid resistance will be used for the simulation of long-term behavior of skid resistance as further functional property with relevance to road safety. Therefore, polishing effects of aggregate surfaces respectively their microtexture are modelled in an iterative process together with TP2. Furthermore, the hysteresis model will be enhanced towards its usability for skid resistance considerations under wet conditions using water film calculations from the 3D-drainage model.The approaches for the computational creation of artificial asphalt structures, which have been developed in the first project phase, as well as analysis methods of the inner structure of (real and artificial) structures based on imaging techniques will be enhanced. They can support considerations of uncertainty regarding the asphalt structure and its impact on mechanical (e.g. deformation behavior) or functional properties (e.g. drainage) within this and the other subprojects. The analysis methods for the inner structures, which will be enhanced, will furthermore be used for investigations of long-term deformation behavior (pretest-posttest study) in cooperation with TP1, TP2 and TP4.The described studies concerning the durability of functional properties (skid resistance, drainage) of road surfaces as well as techniques for replication and analysis of inner structures of asphalt have synergy effects with other subprojects for the comprehensive description of the coupled system road-tire-vehicle – with focus on long-term behavior in the second project phase – in terms of the general aim of the research group.