REJUVENATOR DIFFUSION IN BINDER FILM FOR HOT-MIX RECYCLED ASPHALT PAVEMENT
In hot-mix recycling of bituminous mixes a rejuvenator is commonly used to restore the aged asphalt cement to a condition that resembles that of virgin asphalt cement. The type and amount of rejuvenator to be used are generally determined from a characterization of the recovered weathered binder. However, the extent to which the salvaged bitumen will be softened by the recycling agent during the hot-mix operation, and hence the characteristics of the rejuvenated binder and the resulting performance of the recycled pavement, has not been widely reported. An investigation was undertaken to determine the extent to which certain types of rejuvenators diffuse into the hardened asphalt film coating the aggregate and affect its properties during a specified period of time. A partial extraction technique that had the effect of dividing the asphalt film into microlayers was used. The binder recovered from each microlayer was characterized by means of consistency tests. This technique was used to evaluate the consistency distribution of the binder film around the aggregate in (a) the extracted mix containing recycled asphalt pavement (RAP) only; (b) the extracted mix containing RAP and a rejuvenator; and (c) the extracted mix containing RAP, virgin aggregate, and a rejuvenator.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/isbn/0309044603
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Supplemental Notes:
- Publication of this paper sponsored by Committee on Characteristics of Bituminous Materials. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
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Authors:
- Noureldin, Ahmed S
- Wood, Leonard E
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Conference:
- 66th Annual Meeting of the Transportation Board
- Location: Washington District of Columbia, United States
- Date: 1987-1-12 to 1987-1-15
- Publication Date: 1987
Media Info
- Media Type: Print
- Features: Figures; References; Tables;
- Pagination: pp 51-61
- Monograph Title: Asphalt Materials and Mixtures
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Serial:
- Transportation Research Record
- Issue Number: 1115
- Publisher: Transportation Research Board
- ISSN: 0361-1981
Subject/Index Terms
- TRT Terms: Analysis; Asphalt cement; Bituminous mixtures; Boundary layer; Consistency; Hot in-place recycling; Pavement performance; Recycling; Softening point; Test procedures
- Old TRIS Terms: Microlayer analysis; Rejuvenating agent
- Subject Areas: Highways; Materials; I31: Bituminous Binders and Materials;
Filing Info
- Accession Number: 00467871
- Record Type: Publication
- ISBN: 0309044603
- Files: TRIS, TRB, ATRI
- Created Date: Mar 31 1988 12:00AM