Postcarbone road - The endless cycle of asphalt reuse

在我们现代社会的所有领域，关键的目标是有效利用我们的资源和最佳的可持续性。在道路建设中，沥青的再利用可以显著有助于实现这些目标，因为在德国可以获得大量的再生沥青。这些再生沥青已经重复使用了几十年，而且数量越来越大，因此今天一些沥青已经面临更高的重复使用周期。因此，本项目旨在调查和评估沥青的多次或无限重复使用周期的方法。为此，预计专业合作伙伴鲁尔波鸿大学、柏林工业大学和联邦材料研究与测试研究所之间将开展合作，以便该联合体能够展示在沥青粘合剂和沥青的化学和物理特性表征以及老化和再生行为方面的全面经验。拟建项目主要基于前项目Post carbon road -沥青再利用的无限循环，其重点是不同再生剂对粘合剂水平的影响和机制。根据这个先前的项目，沥青的多次再利用通常可以使用生物基再生剂。但最迟在第四个循环之后，达到临界状态，使得进一步重用变得不可能。这些确定的限制应在拟议项目中消除或转移。为此，将开发用于选定和已知沥青的改性再生剂。然后，将在粘合剂水平（未改性和改性沥青）以及砂胶和沥青水平上研究这种再生剂由于多次老化和再生而产生的效果。此外，在沥青水平上，将更详细地研究多次老化和再生对粘合行为以及再生剂在老化粘合剂中的扩散的影响。对于扩散的评估，计划开发两种基于红外光谱的新方法。为了简化再生沥青混合料的设计，根据结合料或胶浆参数，建立了不同沥青参数的预测模型。总的来说，这个拟议项目的结果将显示一个主要的方法，是否以及如何可以实施沥青的多次或无休止的再利用，这与道路建设部门的几乎所有参与者都相关。

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.