PMSS Project Details

Project ID:	FHWA-PROJ-03-0001
Project Name:	Development of Performance-Based Specification for Asphalt Binders: Fatigue Characterization
Status:	Completed
Contact:	Last Name: Gibson First Name: Nelson H Telephone: 202-493-3073 E-mail: nelson.gibson@dot.gov
Organization:	Federal Highway Administration - Turner-Fairbank Highway Research Center (TFHRC)
Office:	Office of Infrastructure Research and Development
Team:	Pavement Materials Team
Roadmap/Focus area(s):	Infrastructure Research and Technology Strategic Plan and Roadmap
Project Description:	Test pavements were constructed with the primary variable being the binder type. Full-scale rutting and cracking performance were collected and compared to various candidate binder tests to identify the most discriminating element to replace the current specification for asphalt fatigue cracking and rutting.
Laboratories:	Pavement Testing Facility Binder Laboratory Bituminous Mixtures Laboratory Chemistry Laboratory
Start Date:	January 1, 2003
End Date:	June 30, 2010
Funding Amount:	$0.00
FHWA Program Name:	Innovative Pavement Research and Deployment
Goals:	The primary objective of this full-scale accelerated pavement testing was to evaluate the performance of unmodified and polymer-modified asphalt binders, and to recommend improved specification tests over existing Superpave (SUperior PERforming Asphalt PAVEments) performance-grading methodologies.
Project Type:	Onsite
Background Information:	Data not yet available
Test Methodology:	Full-scale accelerated pavement testing with laboratory materials characterization.
Other Information:	Data not yet available
Partners:	Federal Highway Administration: Office of Research, Development, and Technology - Office of Infrastructure Research and Development; Role(s): Technical Connecticut Department of Transportation; Role(s): Advisory, Other stakeholder Florida Department of Transportation; Role(s): Other stakeholder, Advisory Illinois Department of Transportation; Role(s): Advisory, Other stakeholder Iowa Department of Transportation; Role(s): Advisory, Other stakeholder Kansas Department of Transportation; Role(s): Advisory, Other stakeholder Maryland Department of Transportation; Role(s): Advisory, Other stakeholder Michigan Department of Transportation; Role(s): Advisory, Other stakeholder Minnesota Department of Transportation; Role(s): Advisory, Other stakeholder Montana Department of Transportation; Role(s): Advisory, Other stakeholder Nebraska Department of Roads; Role(s): Advisory, Other stakeholder Nevada Department of Transportation; Role(s): Advisory, Other stakeholder New Jersey Department of Transportation; Role(s): Advisory, Other stakeholder New York State Department of Transportation; Role(s): Other stakeholder, Advisory North Carolina Department of Transportation; Role(s): Advisory, Other stakeholder Pennsylvania Department of Transportation; Role(s): Advisory, Other stakeholder Texas Department of Transportation; Role(s): Advisory, Other stakeholder Oregon Department of Transportation; Role(s): Advisory, Other stakeholder
More Information URL(s):
Fieldtest:	Data not yet available
Expected Benefits:	The expected benefit is more durable, longer-lasting asphalt pavements.
Deliverables:	Name: Final report: "Full-Scale Accelerated Performance Testing for Superpave and Structural Validation: Transportation Pooled Fund Study TPF-5(019) and SPR-2(174) Accelerated Pavement Testing of Crumb Rubber Modified Asphalt Pavements" Product Type(s): Research report Description: This final report provides the comprehensive findings from two Transportation Pooled Fund (TPF) research projects: TPF-5(019) Full-Scale Accelerated Performance Testing for Superpave (SUperior PERforming Asphalt PAVEments) and Structural Validation and SPR-2(174) Accelerated Pavement Testing of Crumb Rubber Modified Asphalt Pavements. The research identified candidate purchase specification tests for asphalt binder that better discriminate expected fatigue cracking and rutting performance than current Superpave tests. Full-scale accelerated pavement testing and laboratory characterization tests on mixtures and binders provided the basis for the recommendations.The report documents a historical review of the development of asphalt binder performance specifications, experimental design, test pavement construction and performance, and statistical methodology to rank and identify the strongest candidates, and all pertinent laboratory characterization of binders and mixtures that supplemented the recommendations. The research also provided a detailed case study of pavement evaluation using a falling weight deflectometer and objective means to evaluate two emerging technologies: the Asphalt Mixture Performance Tester and the Mechanistic-Empirical Pavement Design Guide. Audiences: Pavement designers, Pavement engineers, Researchers Secondary Audiences: Publication URL(s): http://www.fhwa.dot.gov/publications/research/infrastructure/pavements/11045/index.cfm
Related URL(s):
Project Findings:	Two fatigue cracking specification tests were identified as being more capable thanothers: binder yield energy and critical tip opening displacement. Two rutting specification tests that quantify irrecoverable deformations exhibited the best strength to capture rutting: multiple stress creep, and recovery and oscillatory-based nonrecoverable stiffness. Based on the full-scale performance and laboratory tests, crumb rubber (recycled tires) modified asphalt (Arizona wet process) was shown to significantly slow or stop the growth of fatigue cracks in a composite asphalt pavementstructure. A hybrid technique to modify asphalt with a combination of crumb rubber and conventional polymers (terminally blended) exhibited good fatigue cracking resistance relative to the control binder without the special handling procedures needed for some crumb rubber modified asphalts. Also, a simple addition of polyester fibers-to-asphalt mix was shown to have high resistance to fatigue cracking without the use of polymer modification.The research study also quantified the capabilities of the National Cooperative Highway Research Program’s mechanistic-empirical pavement design and analysis methodologies to predict rutting and fatigue cracking of modified asphalts that were not captured in the calibration data from the Long-Term Pavement Performance program. Falling weight deflectometer, multidepth deflectometer, and strain gauge instrumentation were used to measure pavement response. The results illustrated that the globally calibrated mechanistic-empirical performance models could differentiate between structural asphalt thickness but had difficulty differentiating modified from unmodified asphalt binder performance. Nonetheless, the mechanistic-empirical performance ranking and predictions were enhanced and improved using mixture-specific performance tests currently being implemented using the Asphalt Mix Performance Tester.
FHWA Topics:	Roads and Bridges--Design Roads and Bridges--Pavement and Materials
TRT Terms:	Testing Fatigue cracking Rutting Superpave Pavement Design Falling Weight Deflectometers Mechanistic Design Performance Tests Research Infrastructure Pavements Bituminous Binders
FHWA Disciplines:	Pavement and Materials
Subject Areas:	Design Highways Research Pavements