ABSTRACT

Porous asphalt (PA), as a wearing course in road construction, has advantages concerning noise reduction and drainage compared to common pavements because of the high void content. In this paper, the hydrological ‘linear reservoir’ model approach is used to analyse and describe the drainage behaviour of porous asphalt as a whole – from infiltration to discharge. This approach includes time-dependent runoff, runoff delay due to retention and the development of discharge rates depending on water stored in the porous asphalt structure. Based on experiments, the storage constant K, describing the model parameter of linear reservoirs, is calculated and compared for different porous asphalt structures, soiling states and amounts of retained water within the porous asphalt structure. It can be shown that higher rainfall intensities and coarser mix designs lead to a lower value of K, which indicates a faster outflow. The different soiling states do not show a significant effect on the storage constant K. The influence of retention capabilities – especially the amount of undrained remaining water volume – on the drainage behaviour in general and the parameter storage constant K are discussed as well. Higher retained water volumes lead to decreased values of K.

摘要

多孔沥青（PA）作为道路建设中的耐磨层，由于孔隙率高，与普通路面相比具有降噪和排水方面的优势。在本文中，水文“线性储层”模型方法用于分析和描述多孔沥青作为一个整体的排水行为——从渗透到排放。这种方法包括随时间变化的径流、由于滞留造成的径流延迟以及取决于储存在多孔沥青结构中的水的排放率的发展。基于实验，计算并比较了不同多孔沥青结构、污染状态和多孔沥青结构内滞留水量的存储常数K，描述了线性储层的模型参数。可以看出，较高的降雨强度和较粗的混合设计导致 K 值较低，这表明流出较快。不同的污染状态对蓄水常数 K 没有显着影响。还讨论了保留能力（尤其是未排水的剩余水量）对排水行为和参数蓄水常数 K 的影响。较高的保留水量导致 K 值降低。