Postcarbone road - The endless cycle of asphalt reuse

在我们现代社会的所有领域，关键的雄心是有效利用我们的资源和最佳的可持续性。在道路建设中，沥青的再利用可以为实现这些目标做出重大贡献，因为德国获得了大量的再生沥青。这些再生沥青已经重复使用了几十年，而且数量越来越大，因此一些沥青今天已经面临着更高的再利用周期。因此，本项目旨在调查和评估沥青多次或无休止再循环的方法。为此，预计专业合作伙伴波鸿鲁尔大学、柏林工业大学和联邦材料研究和测试研究所之间将进行合作，以便该财团能够在沥青粘结剂和沥青的化学和物理性能表征以及老化和再生行为方面展示全面的经验。拟议的项目主要基于前身项目Post Carbon Road-沥青再利用的无尽循环，该项目侧重于不同再生剂在粘结剂层面上的效果和机理。根据这个先前的项目，使用生物基再生剂，沥青的多次再利用通常是可能的。但最迟在第四个周期之后，将达到临界状态，从而不可能进一步重用。这些已确定的限制应在提议的项目中消除或更确切地说是改变。为此，将为选定和已知的沥青开发一种改进的再生剂。然后，将在粘结剂(未改性沥青和改性沥青)以及胶浆和沥青水平上研究这种返老剂由于多次老化和返老性而产生的效果。此外，在沥青层面，将更详细地研究多次老化和再生对粘结性能的影响以及再生剂在老化粘结剂中的扩散。对于扩散的评估，计划开发两种新的基于红外光谱的方法。对于多再生沥青混合料的简化设计，将根据结合料或胶乳参数确定不同沥青参数的预测模型。总的来说，这一拟议项目的结果将显示是否以及如何实现沥青的多次或无休止再利用的主要办法，这与道路建设部门的几乎所有参与者都有关。

In all areas of our modern society, crucial ambitions are the efficient use of our resources and optimal sustainability. In road construction, the reuse of asphalt can significantly contribute to achieving these goals, as large quantities of reclaimed asphalt are obtained in Germany. These reclaimed asphalts have already been reused for decades and in increasingly large quantities so that some asphalts are already facing a higher reuse cycle today. Therefore, this project aims to investigate and evaluate the approach of a multiple or endless reuse cycle of asphalt. For this purpose, a collaboration between the specialised partners Ruhr-Universität Bochum, Technische Universität Berlin and Federal Institute for Materials Research and Testing is foreseen so that the consortium can demonstrate comprehensive experience in the characterisation of the chemical and physical properties as well as the ageing and rejuvenation behaviour of bituminous binders and asphalt. The proposed project is primarily based on the predecessor project Post carbon road – the endless cycle of bitumen reuse, which focused on the effects and mechanisms of different rejuvenators on the binder level. According to this previous project, multiple reuse of bitumen is generally possible using bio-based rejuvenators. But after the fourth cycle at the latest, a critical state is achieved making further reuse impossible. These identified limitations shall be eliminated or rather shifted in the proposed project. For this, a modified rejuvenator will be developed for a selected and known bitumen. The effect of this rejuvenator due to multiple ageing and rejuvenation will then be investigated at the binder level (unmodified and modified bitumen) as well as at the mastic and asphalt level. Furthermore, at the asphalt level, the influence of multiple ageing and rejuvenation on the adhesion behaviour as well as the diffusion of the rejuvenator in the aged binder will be investigated in more detail. For the evaluation of the diffusion, the development of two new method based on infrared spectroscopy is planned. For a simplified design of asphalt mixtures with multiple reused reclaimed asphalts, prediction models for different asphalt parameters based on binder or rather mastic parameters will be determined. In general, the results of this proposed project will show a principal approach whether and how a multiple or endless reuse of asphalt can be implemented being relevant for almost all players of the road construction sector.