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Evaluation of the Rheological Properties and Molecular Distributions of Asphalt Binder Under Multiple Aging and Rejuvenation Cycles (MARC)
Because of the widespread use of reclaimed asphalt pavement (RAP), various recycling agents are developed and used in pavement engineering nowadays to restore the properties of RAP in asphalt mixes. Whereas there are many recycling agents available, it remains unclear on the fundamental rejuvenation mechanisms behind the different recycling agents and how to select the proper product to restore RAP properties. In addition, there remain important questions in terms of RAP repeated recycling and the continuity of restoration capacity from these recycling agents. Therefore, this study is designed to track the properties changes of the asphalt binders in the context of multiple aging and rejuvenating cycles (MARC). Three different types of recycling agent products are selected and evaluated using rheological characterization and chromatography (molecular distribution) analysis. Results show the differences between recycling agents with regard to property recovery of asphalt can be amplified in MARC, and the weakness of common recycling agents for phase angle restoration compared to complex modulus is highlighted. The strong positive correlation between phase angle and MMS indicates MMS proportion plays a significant role in determining the relaxation capability (phase angle) of the asphalt materials.
Evaluation of the Rheological Properties and Molecular Distributions of Asphalt Binder Under Multiple Aging and Rejuvenation Cycles (MARC)
Because of the widespread use of reclaimed asphalt pavement (RAP), various recycling agents are developed and used in pavement engineering nowadays to restore the properties of RAP in asphalt mixes. Whereas there are many recycling agents available, it remains unclear on the fundamental rejuvenation mechanisms behind the different recycling agents and how to select the proper product to restore RAP properties. In addition, there remain important questions in terms of RAP repeated recycling and the continuity of restoration capacity from these recycling agents. Therefore, this study is designed to track the properties changes of the asphalt binders in the context of multiple aging and rejuvenating cycles (MARC). Three different types of recycling agent products are selected and evaluated using rheological characterization and chromatography (molecular distribution) analysis. Results show the differences between recycling agents with regard to property recovery of asphalt can be amplified in MARC, and the weakness of common recycling agents for phase angle restoration compared to complex modulus is highlighted. The strong positive correlation between phase angle and MMS indicates MMS proportion plays a significant role in determining the relaxation capability (phase angle) of the asphalt materials.
Evaluation of the Rheological Properties and Molecular Distributions of Asphalt Binder Under Multiple Aging and Rejuvenation Cycles (MARC)
Carter, Alan (editor) / Vasconcelos, Kamilla (editor) / Dave, Eshan (editor) / Wang, Rui (author) / Zhang, Runhua (author) / Bahia, Hussain U. (author)
International Symposium on Asphalt Pavement & Environment ; 2024 ; Montreal, QC, Canada
14th International Conference on Asphalt Pavements ISAP2024 Montreal ; Chapter: 97 ; 585-590
2024-12-24
6 pages
Article/Chapter (Book)
Electronic Resource
English
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