asphalt aging and fatigue - western...
TRANSCRIPT
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Asphalt Aging and Fatigue
Ron Glaser Mike FarrarShin-Che HuanggJohn SchabronFred Turner
Program Review
January 27, 2011
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Aging Studies
• SUBTASK 2‐2.1 IMPACT OF WATER ON AGING
• SUBTASK 2‐2.2 SUPPORT OF THE MECHANISTIC‐EMPIRICAL PAVEMENT DESIGN GUIDE Aging StudyPAVEMENT DESIGN GUIDE‐ Aging Study
• SUBTASK 2‐2.3 AUTOMATED ON‐COLUMN PRECIPITATION AND RE‐DISSOLUTION ANALYSIS
• SUBTASK 3‐2D LABORATORY AND FIELD AGING INFLUENCE ON EMBRITTLEMENT
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Problem
• How does aging affect asphalt pavement durability?
• What changes in chemical composition with aging cause reductions in endurance performance?reductions in endurance performance?
• Can we adjust binder composition or pavement section design to increase service life ?
• What maintenance procedures make sense to extend service life ?
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What happens when asphalt ages (oxidizes)(oxidizes)
• Asphalt ages through oxidation, changing the chemical composition
• Changes in the chemical composition change the mechanical propertiesmechanical properties
• Aged Pavements are more brittle and relieve stress much more slowly than new pavements
• Aged Pavements heal more slowly accumulate damage• Aged Pavements heal more slowly, accumulate damage more quickly
• The service life of the pavement is greatly affected by aging
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Design for Aging
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Aging Study
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Aging Study Characterization
• FTIR‐Multi‐solvent – to obtain rate expressions
• CHNS‐DO – to investigate rates based upon oxygen uptake
DSR t bt i h l i l ti• DSR – to obtain rheological properties
• DSC – to evaluate changes in glass transition width
• LAST – to quantify fatigue resistance• LAST – to quantify fatigue resistance
• AD – speciation of asphaltenes
• SARA + IR – solvent defined fraction changes, reactants and g ,products fates
• AFT – solvation shell dimension and compatibility
• NMR – aromatization changes
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Aging Study Materials
• ALF 70‐22 RTFO binder
• ManitobaManitoba• Tank, RTFO in support of warm mix studies
• Minnesota • A,B,C RTFO binder
• SHRP RTFO binders (4)
• 2 ARC RTFO binders• 2 ARC RTFO binders
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Progress to date
• Aging – first set of samples recently completed
• Elemental Analysis – selected ALF samples
• FTIR – over 50% complete
AD T k 3D li i k l t ALF l• AD – Task 3D preliminary work complete on ALF samples
• SARA + IR – just started
• DSC – selected ALF samples• DSC selected ALF samples
• AFT – not started
• NMR – not started
• DSR – not started
• LAST – not started
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Preliminary Results and Observations
Good correlations exist between the following metrics d f iand extent of aging:
• Sulfoxide plus carbonyl IR absorbance
• Direct oxygen from elemental Analysisyg y
• Toluene/heptane peak ratio from AD
• Glass transition width from DSC
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Design for Aging
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Design for Aging
• Parallel first and zero order rate expressions fit the data welldata well.
• Film diffusion model is more fundamental• Film modeling fits suggests mass transfer inside
the binder is rate limiting
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Design for Aging
• Simple expressions produce activation energy values near viscous flow values
• The film diffusion model explicitly accounts for viscosity changes
• Differences in AAD and AAG reconciled with anDifferences in AAD and AAG reconciled with an internal diffusion length adjustment
• Simpler testing of this physical parameter may d d di iproduce good rate predictions
• A practical, fundamentally based spec test for aging rate may be possible (AFT)g g y p ( )
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Design for Aging
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Design for Aging
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Design for Aging
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Stress profiles due to property gradientsgradients
• Asphalt binders exhibit dramatic changes in elasticity with temperature
• Asphalt binders also exhibit dramatic changes in elasticity• Asphalt binders also exhibit dramatic changes in elasticity as they age
• Asphalt binders age more near the surface of the pavement
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Property Gradients
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Property Gradients
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Static‐Elastic Modeling of Thermal Stresses Aging and Block CrackingStresses… Aging and Block Cracking
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So What?
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Products (Asphalt Research Community)Community) ….
• Multivariate Regression of Over Defined Data‐Beta release in progress (VB.NET)
• Master Curve Shift Factor Parameter Fits with extent of• Master Curve‐Shift Factor Parameter Fits with extent of aging
• Multi‐solvent method for high resolution IR studies
• Advanced Spectral Subtraction methods
• Peak series decomposition program
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Products (Asphalt Paving Community)Community) ….
• Correlation of IR response to rheology
• Micro‐sampling of pavement for stiffness evaluation using IRIR
• Aging rate prediction spec test
• DSR replacement of BBR using 4mm platesDSR replacement of BBR using 4mm plates
• Improvements in the MEPDG, particularly the Global Aging System and TCModel to account for aging effects
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Thanks for Your Attention...
• Questions ?
• Comments ?
Di i ?• Discussion ?
• rglaser@uwyo edu• [email protected]