Comparative Evaluation of Methods for Removing Residual Mineral Fillers during Bitumen Extraction and Recovery Based on FTIR
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 12
Abstract
Asphalt extraction and recovery are essential steps before characterizing components and properties of aged asphalt binders for recycling the reclaimed asphalt pavement (RAP). To accurately analyze the aged asphalt, it is essential to evaluate removal efficiency of residual mineral fillers during bitumen extraction and recovery. This study investigated three methods (filtration, gravitational sedimentation, and centrifugal sedimentation) to separate base asphalt and styrene-butadiene-styrene (SBS)-modified asphalt from the mineral fillers using trichloroethylene (TCE) solvent. The removal efficiency was quantitatively evaluated by the index of silicon–oxygen bond based on Fourier transform infrared spectroscopy (FTIR). Furthermore, comparative evaluation and consumption analysis were carried out to assess removal efficiency and energy consumption of the three methods. The results demonstrated that centrifugal sedimentation was the best way to get the cleanest asphalt binder, while gravitational sedimentation was superior in terms of removal efficiency, and thus it can be used to obtain larger amounts of the “pure” aged asphalt for macrotest. The removal efficiencies of the three methods were affected by the types of asphalt and concentrations of the asphalt-trichloroethylene solutions.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request, including the data from Figs. 2 and 7 as well as the data to support Eqs. (5)–(7).
Acknowledgments
This study was supported by the National Natural Science Foundation of China under Project Nos. 51778478 and 51861145402.
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 12 • December 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Jan 29, 2020
Accepted: May 29, 2020
Published online: Sep 19, 2020
Published in print: Dec 1, 2020
Discussion open until: Feb 19, 2021
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