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

在耐久性方面，除了路面的结构物质及其典型的开裂、变形等劣化机制外，还必须考虑路面的表面特性及其相关的功能特性。与用户道路安全相关的功能特性包括：防滑和排水。这就是为什么处理这种特性的长期行为和有关道路结构和表面的变化（变形、宏观和微观结构的变化）的方法和模型将与研究小组的其他子项目合作进行评估。在项目第一阶段开发的3d排水模型将得到加强，以模拟排水作为功能属性的长期行为。将考虑塑性变形（TP1的模拟，TP4的实验）以及宏观织构特征的变化，系统地模拟它们对水径流和水膜深度的影响。ISV开发的用于模拟抗滑现象的微观结构贡献的滞后模型将用于模拟抗滑的长期行为，作为与道路安全相关的进一步功能特性。因此，骨料表面的抛光效应及其微观结构与TP2是一个迭代过程。此外，利用3d排水模型中的水膜计算，滞回模型将增强其在潮湿条件下的防滑性考虑的可用性。将加强在项目第一阶段开发的人工沥青结构的计算方法，以及基于成像技术的（真实和人工）结构的内部结构分析方法。它们可以支持考虑沥青结构的不确定性及其对本项目和其他子项目的机械（例如变形行为）或功能特性（例如排水）的影响。内部结构的分析方法将得到加强，并将与TP1、TP2和TP4合作，进一步用于长期变形行为的研究（前测后测研究）。所描述的关于路面功能特性耐久性（防滑、排水）的研究以及沥青内部结构的复制和分析技术与其他子项目具有协同效应，可以全面描述道路-轮胎-车辆耦合系统-重点关注第二个项目阶段的长期行为-就研究小组的总体目标而言。

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.