Performance Characteristics of High RAP Bio-modified Asphalt Mixtures
The purpose of this study was to evaluate the effect of a bio-modified binder on the performance and workability of asphalt mixtures designed with and without a high Reclaimed Asphalt Pavement (RAP) content. The bio-modified binder was prepared by modifying a virgin asphalt binder with bio-binder produced from swine manure. The four mixtures that were designed and evaluated were: a control mixture incorporating virgin materials, the control mixture incorporating 40% RAP, the control mixture incorporating the bio-modified binder and the control mixture incorporating the bio-modified binder and 40% RAP. The effect of the bio-modified binder on the stiffness and workability of the control mixture with and without RAP was evaluated by measuring the dynamic modulus and the torque resistance of the mixtures respectively. The performance of each mixture was evaluated for fatigue cracking (Overlay Tester) and moisture susceptibility/rutting potential (Hamburg Wheel Tracking Device). Finally, the degree of blending between the virgin and RAP binders was evaluated for each mixture. The data indicated that the addition of bio-modified binder helped reduce the stiffness of the control mixture with 40% RAP to a level closer to the stiffness of the same mixture without RAP. Correspondingly, the mixture workability for the control mixture with 40% RAP was improved. The data indicated that the bio-modified binder improved the cracking characteristics and had no negative effect on the moisture susceptibility/rutting characteristics of the control mixture with 40% RAP. Overall, data indicated that there was a good degree of blending between the virgin/bio-modified and RAP binders.
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Supplemental Notes:
- This paper was sponsored by TRB committee AFK10 General Issues in Asphalt Technology
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Corporate Authors:
500 Fifth Street, NW
Washington, DC United States 20001 -
Authors:
- Mogawer, Walaa S
- Fini, Elham H
- Austerman, Alexander J
- Booshehrian, Abbas
- Zada, Boubacar
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Conference:
- Transportation Research Board 91st Annual Meeting
- Location: Washington DC, United States
- Date: 2012-1-22 to 2012-1-26
- Date: 2012
Language
- English
Media Info
- Media Type: Digital/other
- Features: Figures; References; Tables;
- Pagination: 16p
- Monograph Title: TRB 91st Annual Meeting Compendium of Papers DVD
Subject/Index Terms
- TRT Terms: Asphalt mixtures; Fatigue cracking; Mix design; Moisture content; Pavement performance; Recycled materials; Rutting; Stiffness
- Subject Areas: Highways; Materials; Pavements; I22: Design of Pavements, Railways and Guideways; I30: Materials;
Filing Info
- Accession Number: 01373365
- Record Type: Publication
- Report/Paper Numbers: 12-2411
- Files: TRIS, TRB
- Created Date: Jun 21 2012 4:37PM