Fatigue Life Characterization of Superpave Mixtures at the Virginia Smart Road

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dc.contributorVirginia Tech Transportation Instituteen
dc.contributorVirginia Techen
dc.contributor.authorAl-Qadi, Imad L.en
dc.contributor.authorDiefenderfer, Stacey D.en
dc.contributor.authorLoulizi, Amaraen
dc.date.accessed2013-11-21en
dc.date.accessioned2014-03-19T18:30:17Zen
dc.date.available2014-03-19T18:30:17Zen
dc.date.issued2005-08en
dc.description.abstractLaboratory fatigue testing was performed on six Superpave HMA mixtures in use at the Virginia Smart Road. Evaluation of the applied strain and resulting fatigue life was performed to fit regressions to predict the fatigue performance of each mixture. Differences in fatigue performance due to field and laboratory production and compaction methods were investigated. Also, in-situ mixtures were compared to mixtures produced accurately from the job mix formula to determine if changes occurring between the laboratory and batch plant significantly affected fatigue life. Results from the fatigue evaluation allowed verification of several hypotheses related to mixture production and compaction and fatigue performance. It was determined that location within the pavement surface, such as inner or outer wheelpath or center-of-lane, did not significantly affect laboratory fatigue test results, although the location will have significant effects on in-situ fatigue life. Also the orientation of samples cut from an in-situ pavement (parallel or perpendicular to the direction of traffic) had only a minor effect on the laboratory fatigue life, because the variability inherent in the pavement due to material variability is greater than the variability induced by compaction. Fatigue life of laboratory-compacted samples was found to be greater than fatigue life of field-compacted samples; additionally, the variability of the laboratory compacted mixture was found to be less than that of the field-compacted samples. However, it was also found that batch-plant production significantly reduces specimen variability as compared to small-batch laboratory production when the same laboratory compaction is used on both specimen sets. Finally, for Smart Road mixtures produced according to the job mix formula, the use of polymer-modified binder or stone matrix asphalt was shown to increase the expected fatigue life. However, results for all mixes indicated that fatigue resistance rankings might change depending on the applied strain level. This study contributes to the understanding of the factors involved in fatigue performance of asphalt mixtures. Considering that approximately 95% of Virginia's interstate and primary roadways incorporate asphalt surface mixtures, and that fatigue is a leading cause of deterioration, gains in the understanding of fatigue processes and prevention have great potential payoff by improving both the mixture and pavement design practices.en
dc.description.sponsorshipVirginia Department of Transportation 53879en
dc.description.sponsorshipFHWA 53879en
dc.format.extent60 pagesen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationImad L. Al-Qadi, Stacey Diefenderfer, and Amara Loulizi. "Fatigue Life Characterization of Superpave Mixtures at the Virginia Smart Road," Virginia Transportation Research Council 530 Edgemont Road Charlottesville, VA 22903, Report No. FHWA/VTRC 06-CR1, Aug. 2005.en
dc.identifier.govdocFHWA/VTRC 06-CR1en
dc.identifier.urihttp://hdl.handle.net/10919/46684en
dc.identifier.urlhttp://www.virginiadot.org/vtrc/main/online_reports/pdf/06-cr1.pdfen
dc.language.isoenen
dc.publisherVirginia Center for Transportation Innovation and Researchen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectFatigue life characterizationen
dc.subjectVibratory compactionen
dc.subjectThird point bending fatigueen
dc.subjectPavement performanceen
dc.titleFatigue Life Characterization of Superpave Mixtures at the Virginia Smart Roaden
dc.typeTechnical reporten
dc.type.dcmitypeTexten

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