Development of High RAP–High Performance Thin-Lift Overlay Mix Design Using a Soybean Oil-Derived Rejuvenator
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 6
Abstract
A laboratory study was conducted to develop a thin-lift overlay (Thinlay) mix design containing a polymer-modified PG58-34E+ binder with a 3.5% add to the mix, and 40% fine reclaimed asphalt pavement (RAP) that would meet the criteria for the State of Iowa using a bioderived rejuvenator called sub-epoxidized soybean oil (SESO). Two groups of binder and mix specimens were created for this investigation: (1) a control with no SESO, and (2) a rejuvenated group with 0.28% SESO by total mix weight (4.88% by total binder content-RAP binder + PG58-34E+), where the binder groups were evaluated using the multiple stress creep recovery (MSCR) test and bending beam rheometer (BBR), while the mix groups were evaluated using rutting, low-temperature, and fatigue performance tests. Binder results showed that the optimal dosage of SESO must be higher than 8% to achieve a PG46-46E+ to account for RAP inclusion in the mix design. Binder performance had a significant effect on low-temperature mix and fatigue performance, while rutting performance was found to be acceptable for the rejuvenated group.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 6 • June 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Aug 8, 2019
Accepted: Nov 20, 2019
Published online: Mar 27, 2020
Published in print: Jun 1, 2020
Discussion open until: Aug 27, 2020
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