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Impact of Recycled Binder Availability on Performance Properties of RAP Asphalt Mixtures.

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Title: Impact of Recycled Binder Availability on Performance Properties of RAP Asphalt Mixtures.
Authors: Yin, Fan1 (AUTHOR) f-yin@auburn.edu, Taylor, Adam2 (AUTHOR) tayloa3@auburn.edu, Chen, Chen3 (AUTHOR) czc0105@auburn.edu, Moraes, Raquel4 (AUTHOR) moraes@auburn.edu, Tran, Nam5 (AUTHOR) nht0002@auburn.edu
Source: Journal of Materials in Civil Engineering. Sep2025, Vol. 37 Issue 9, p1-14. 14p.
Subjects: Asphalt pavements, Asphalt testing, Limestone, Granite, Mixtures, Asphalt
Abstract: This study evaluated the impact of recycled binder availability (RBA) on the performance properties of asphalt mixtures in Florida, covering two recycled asphalt pavements (RAP) contents (20% and 40%) and two aggregate types (granite and limestone). According to the current state specification, the 20% RAP mixture used a performance grade (PG) 76-22 polymer-modified asphalt binder, and the 40% RAP mixture used a PG 52-28 binder. Each mixture was subjected to a rigorous performance testing plan at two asphalt binder contents: volumetric optimum binder content (V-OBC) and RBA-adjusted optimum binder content (A-OBC) at 80% RBA. The testing plan included the indirect tensile asphalt cracking test (IDEAL-CT), overlay test (OT), Hamburg wheel tracking test (HWTT), asphalt pavement analyzer (APA), and indirect tensile asphalt rutting test (IDEAL-RT). Test results indicated that adding more virgin binders, considering 80% RBA, improved cracking resistance but reduced moisture resistance in RAP mixtures, especially those with 40% RAP. Increasing virgin binder content also reduced rutting resistance in 40% RAP mixtures but had a negligible impact on 20% RAP mixtures. At A-OBC, 40% RAP mixtures had comparable cracking resistance but were more rutting resistant than 20% RAP mixtures. Additional HWTT and IDEAL-CT testing of 40% RAP mixtures showed that grade bumping the virgin binder from PG 52-28 to PG 58-28 and PG 58-22 improved the rutting and moisture resistance of 40% RAP mixtures, but its impact on the cracking resistance varied depending on the virgin aggregate type. Finally, the HWTT, APA, and IDEAL-RT results were strongly correlated, whereas the IDEAL-CT and OT results showed a moderate or weak correlation depending on the mixture aging condition. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:This study evaluated the impact of recycled binder availability (RBA) on the performance properties of asphalt mixtures in Florida, covering two recycled asphalt pavements (RAP) contents (20% and 40%) and two aggregate types (granite and limestone). According to the current state specification, the 20% RAP mixture used a performance grade (PG) 76-22 polymer-modified asphalt binder, and the 40% RAP mixture used a PG 52-28 binder. Each mixture was subjected to a rigorous performance testing plan at two asphalt binder contents: volumetric optimum binder content (V-OBC) and RBA-adjusted optimum binder content (A-OBC) at 80% RBA. The testing plan included the indirect tensile asphalt cracking test (IDEAL-CT), overlay test (OT), Hamburg wheel tracking test (HWTT), asphalt pavement analyzer (APA), and indirect tensile asphalt rutting test (IDEAL-RT). Test results indicated that adding more virgin binders, considering 80% RBA, improved cracking resistance but reduced moisture resistance in RAP mixtures, especially those with 40% RAP. Increasing virgin binder content also reduced rutting resistance in 40% RAP mixtures but had a negligible impact on 20% RAP mixtures. At A-OBC, 40% RAP mixtures had comparable cracking resistance but were more rutting resistant than 20% RAP mixtures. Additional HWTT and IDEAL-CT testing of 40% RAP mixtures showed that grade bumping the virgin binder from PG 52-28 to PG 58-28 and PG 58-22 improved the rutting and moisture resistance of 40% RAP mixtures, but its impact on the cracking resistance varied depending on the virgin aggregate type. Finally, the HWTT, APA, and IDEAL-RT results were strongly correlated, whereas the IDEAL-CT and OT results showed a moderate or weak correlation depending on the mixture aging condition. [ABSTRACT FROM AUTHOR]
ISSN:08991561
DOI:10.1061/JMCEE7.MTENG-20162