ABSTRACT

The present study reports on rheological properties of rejuvenated non-aged and aged bitumen samples with a pyrolytic product (PP) as a rejuvenator. Various experimental and numerical methods were used in order to investigate the addition of various concentrations of PP to aged and non-aged bitumen samples. It was confirmed that the application of PP as a rejuvenator to the aged bitumen has been successful. The main focus of the study was on the use of several mathematical and mechanical models, which would successfully describe and predict experimental results. Precise calculations for the complex modulus were obtained by generalised five-parameter Sigmoidal model, while the Al-Qadi model enabled good predictions for the phase angle estimations. However, better predictions of rheological parameters were obtained for non-aged bitumen. The results confirmed the possibility of using the prediction models for the estimation of various rheological properties of aged and non-aged bitumen samples with the addition of rejuvenator.

摘要

本研究报告了以热解产物 (PP) 作为再生剂的再生非老化和老化沥青样品的流变特性。为了研究向老化和非老化沥青样品中添加不同浓度的 PP，使用了各种实验和数值方法。经证实，PP作为再生剂在老化沥青中的应用取得了成功。该研究的主要重点是使用几种数学和力学模型，这些模型将成功地描述和预测实验结果。复数模量的精确计算是通过广义五参数 Sigmoidal 模型获得的，而 Al-Qadi 模型可以很好地预测相角估计。然而，对于未老化的沥青，获得了更好的流变参数预测。