EFFECT OF ASPHALT FILM THICKNESS ON SHORT AND LONG TERM AGING OF ASPHALT PAVING MIXTURES
This study was undertaken to quantify the relationship between various asphalt film thicknesses and the aging characteristics of the asphalt paving mix, so that an optimum film thickness desirable for satisfactory mix durability could be established. Mixes prepared with asphalt binder film thickness ranging from about 4 to 13 microns, were subjected to accelerated aging using Strategic Highway Research Program (SHRP) procedures to simulate both short and long term aging. Both the aggregate (RD) and the asphalt cement (AAM-1) used in this study were obtained from the SHRP Materials Reference Library. The aged, compacted mix was tested for tensile strength, tensile strain at failure and resilient modulus. The aged asphalt cement was recovered and tested for penetration, viscosity, complex modulus and phase angle. Aging indices were obtained from these tests, and the relationship between film thickness and the aged mix/aged asphalt cement properties were determined using regression analysis. For the particular aggregate/asphalt cement combination used in this study, it was found that accelerated aging would occur if the asphalt binder film thickness was less than 9 - 10 microns in a asphalt paving mixture compacted to 8% air void content.
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- This paper was presented at the 75th Annual Meeting of the Transportation Research Board held in Washington, DC (January 7-11, 1996).
National Center for Asphalt TechnologyAuburn University, 277 Technology Parkway
Auburn, AL United States 36830
- Kandahl, P S
- Chakraborty, S
- Publication Date: 1996-1
- Features: Figures; References; Tables;
- Pagination: 34 p.
- TRT Terms: Aggregates; Asphalt; Asphalt cement; Binders; Durability; Films (Coatings); Paving materials; Thickness
- Uncontrolled Terms: Film thickness
- Old TRIS Terms: Aging; Paving mixtures
- Subject Areas: Geotechnology; Highways; Materials; I31: Bituminous Binders and Materials;
- Accession Number: 00724580
- Record Type: Publication
- Report/Paper Numbers: NCAT 96-1
- Files: TRIS
- Created Date: Aug 15 2001 12:00AM