Wu, G; Zhang, H; Sun, J and Yu, T (2023) Comparative analysis on rheological characteristics of different modified asphalt based on dsr and bbr evaluation. Journal of Engineering, Design and Technology, 21(5), pp. 1568-1587. ISSN 1726-0531
Abstract
Purpose: In order to evaluate the rheological properties of asphalt more comprehensively and effectively, and to explore and discuss the practicability of relevant models in the evaluation of the rheological properties of asphalt. Design/methodology/approach: Based on the rheological and viscoelastic theories, temperature scanning, frequency scanning and multiple stress creep recovery (MSCR) tests of different modified asphalt were carried out by dynamic shear rheometer (DSR) to obtain relevant viscoelastic parameters and evaluate the high temperature properties of different modified asphalt. Based on the time-temperature equivalence principle, the main curve was constructed to study the viscoelastic properties of asphalt in a wider frequency domain. The main curve was fitted with the CAM model, and the rheological properties of different modified asphalt were evaluated through the analysis of model parameters. The creep stiffness and creep velocity of different modified asphalt were obtained through the rheological test of bending beam (BBR), and the low-temperature performance of different modified asphalt was analyzed by using Burgers model to fit the creep compliance. Findings: The results show that the high temperature rheological properties of several modified asphalt studied in the test are ranked from best to worst as follows: PE modified asphalt > SBS modified asphalt > SBR modified asphalt. Short-term aging can improve the high temperature performance of asphalt, and different types of modifiers can promote or inhibit this improvement effect. Based on BBR test and Burgers model fitting analysis, SBR modified asphalt has the best low temperature performance, followed by SBS modified asphalt, while PE modified asphalt has poor low temperature performance, so it is not suitable to be used as road material in low temperature area. Originality/value: Combined with effective evaluation methods, the rheological properties of asphalt at different temperatures and angles were systematically evaluated, and the evolution of rheological properties of asphalt characterized by model parameters was further analyzed by advanced model simulation.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | burgers model; dsr and bbr evaluation; modified asphalt; principle; rheological characteristics; time-temperature equivalence |
| Index terms: | methodology, evolution, viscoelastic property, compliance, comparative analysis, beam, low temperature, high temperature, recovery |
| Subjects: | health safety and environment, material properties and characteristics, structural engineering, research methods, thermal systems, environmental science, data analysis and analytics, operations management |
| Topics: | Construction Materials, Engineering Principles, Project Management, Research Practice, Health and Safety, Sustainability |
| Descriptive scope: | 4 PCTA |
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