Comparison of Moduli of Kansas Superpave Asphalt Mixes
Currently, hot-mix asphalt (HMA) mixture design and pavement structural design are not fully integrated, although SuperpaveĀ® asphalt mixture design is somewhat project specific. The objective of this study was to compare elastic moduli assumed during structural design of pavements with the backcalculated moduli of HMA layers obtained from the falling weight deflectometer (FWD) tests and the dynamic modulus values measured in the laboratory. Five newly built Superpave pavements, designed by using the 1993 AASHTO Design Guide, were selected as study sites in this research. Deflection data were collected with a Dynatest 8000 FWD on a 1,000-ft test section at each site. The HMA layer moduli were then backcalculated by using an elastic-layer analysis program. Full depth cores were taken from each section and tested in the laboratory for dynamic moduli. The results showed that backcalculated and laboratory moduli were somewhat comparable for all practical purposes. The laboratory dynamic moduli increased with the loading frequency, indicating the need for consideration of vehicle speeds in the HMA pavement structural design. HMA design moduli, assumed by the Kansas Department of Transportation during pavement structural design, are lower than both backcalculated and laboratory dynamic moduli. Thus, current HMA design moduli are achievable in the field through Superpave mixture design, despite the fact that the pavement structural design and mix design processes are not integrated.
- Record URL:
- Summary URL:
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Availability:
- Find a library where document is available. Order URL: http://www.trb.org/Main/Blurbs/Pavement_Management_2010_Volume_2_164467.aspx
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Authors:
- Gedafa, Daba S
- Hossain, Mustaque
- Romanoschi, Stefan A
- Gisi, Andrew J
- Publication Date: 2010
Language
- English
Media Info
- Media Type: Print
- Features: Figures; References; Tables;
- Pagination: pp 114-123
- Monograph Title: Pavement Management 2010, Volume 2
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Serial:
- Transportation Research Record: Journal of the Transportation Research Board
- Issue Number: 2154
- Publisher: Transportation Research Board
- ISSN: 0361-1981
Subject/Index Terms
- TRT Terms: Backcalculation; Core samples; Deflection; Dynamic modulus of elasticity; Falling weight deflectometers; Hot mix asphalt; Laboratory tests; Mix design; Modulus of elasticity; Pavement design; Superpave
- Uncontrolled Terms: Elastic layer analysis
- Geographic Terms: Kansas
- Subject Areas: Design; Highways; Materials; Pavements; I22: Design of Pavements, Railways and Guideways; I31: Bituminous Binders and Materials;
Filing Info
- Accession Number: 01152248
- Record Type: Publication
- ISBN: 9780309142946
- Report/Paper Numbers: 10-2539
- Files: TRIS, TRB, ATRI
- Created Date: Mar 16 2010 6:12AM