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

除了路面的结构实体及其典型的开裂和变形等劣化机理外，还必须从耐久性的角度来考虑路面特性和相关的功能特性。与使用者的道路安全相关的功能特性包括防滑和排水。这就是为什么将与研究组的其他子项目合作，评估处理该属性的长期行为以及与道路结构和表面相关的变化(变形、宏观和微观结构变化)的方法和模型。在第一个项目阶段开发的3D排水模型将得到增强，以模拟排水作为功能性属性的长期行为。考虑塑性变形(TP1模拟、TP4实验)以及宏观纹理特征的变化，系统地模拟它们对径流和水膜深度的影响；ISV为模拟微观纹理对防滑现象的贡献而开发的滞后模型将用于模拟长期抗滑行为，作为与道路安全相关的进一步功能特性。因此，集料表面的抛光效果分别与其微观纹理一起与TP2一起在迭代过程中建模。此外，滞回模型将利用3D排水模型中的水膜计算增强其在潮湿条件下考虑防滑的可用性。在第一阶段开发的人工沥青结构的计算创建方法以及基于成像技术的(真实和人工)结构内部结构的分析方法将得到加强。它们可以支持考虑关于沥青结构及其对本项目和其他子项目中的力学(例如变形行为)或功能特性(例如排水)的影响的不确定性。内部结构的分析方法将得到改进，并将进一步用于与TP1、TP2和TP4合作的长期变形行为研究(前测-后测研究)。所述关于路面功能特性(抗滑、排水)耐久性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，以综合描述道路-轮胎-车辆耦合系统--重点关注第二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.