Analysis of rheological properties and micro-mechanism of aged and reclaimed asphalt based on multi-scales. (28th February 2022) - Lin, Mei
Highlights: Analyzing the microscopic mechanism of RAP regeneration at multicale. Comparative analysis of asphalt microstructure changes with varied aging methods. Qualitative and quantitative analysis of asphalt micro characteristics. Abstract: A large amount of reclaimed asphalt pavement (RAP), which is generated by the maintenance and repair of old asphalt pavement, is in urgent need of treatment. To better utilize RAP, the rheological properties and the microscopic mechanism of RAP is discussed.In this project, two methods are used to prepare aged asphalt: laboratory simulation of aging and actual aging. By the Dynamic Shear Rheometer (DSR) test, the effects of different conditions on rheological parameters were analyzed, and the rheological properties of the aged and regenerated asphalt were discussed. In combination with the microstructure tests Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) and atomic force microscopy (AFM), the relationship between the viscosity, rheological parameters and intermolecular forces of reclaimed asphalt was clarified. The results show the increase of asphalt intermolecular adhesion leads to a decrease in the viscosity of the asphalt and complex shear modulus. Subsequently, the relationship among chemical components, microstructure and rheological properties of reclaimed asphalt was established, and the microscopic mechanism of reclaimed asphalt was revealed, which provided important micro evaluation method and the theoretical basis for the effective utilization of aging asphalt.