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Page 1: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

AsphaltExpertTaskGroupUpdateandEmergingTopics

MatthewCorrigan,P.E.U.S.DOT|FederalHighwayAdministration

Preconstruction,Construction,andPavementsOctober2017

Page 2: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

• ForumforGovernment,Industry,andAcademia

• Discussionofongoingasphaltbinderandmixturetechnology

• Providetechnicalinputforcurrentandfutureresearch,development,andspecifications.

AsphaltExpertTaskGroups

Page 3: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

• AsphaltMixture&ConstructionETG• LastmeetinginBozemanonSept20-21,2017

• POC– MatthewCorrigan

• AsphaltBinderETG• LastmeetinginBozemanonSept19-20,2017

• POC– MatthewCorrigan

• SustainablePavementsTWG• POC– GinaAhlstrom

AsphaltExpertTaskGroups

OpenMeetingsAllareWelcome!

Page 4: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

www.AsphaltETGs.org

UpcomingETGMeetingsToBeAnnounced(Nexttentative- weekofApril23,2018)

PastETGMeetingsSeptember2017— Bozeman,MTMay2017— Ames,IASeptember2016— FallRiver,MAApril2016— SaltLakeCity,UTSeptember2015— OklahomaCity,OKApril2015—FallRiver,MASeptember2014—BatonRouge,LA

Page 5: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

• AsphaltMixturePerformanceTester(AMPT)• PerformanceTestsforCracking/Fatigue• RAP&RASAsphaltBinderReplacement

• PerformanceRelated/BasedSpecifications• ΔTc andrelatedrheologicalparameters• ProvidetechnicalinputtoAASHTOCommitteeon

Materials&Pavements(COMP)&assistimprovement,revision,andupdateofstandardsandspecifications

CurrentAsphaltETG- Activities

• BalancedMixDesign• MSCRBinderGrading• GroundTireRubber

Page 6: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

• ResultsusedforMEDesignandPRS/PBSinputs

• AdoptedAASHTOStandards(2017):– R83-17forpreparationofAMPTtestspecimens

– T378-17forDynamicModulus|E*|andFlowNumber(Fn)

– R84-17fordeveloping|E*|mastercurves

– TP107-14(2016)forCyclicFatigue(cracking)

– anddraftTPXXforStressSweepRutting

AsphaltMixPerformanceTester(AMPT)www.fhwa.dot.gov/pavement/asphalt/tester.cfm

AlreadyinvestedinAMPTequipmentforPavementME …theAMPTcandomuchmorethanjust|E*|testing!!

Page 7: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

1. Heritageand“pedigree”ofthetheory–aerospaceindustryapplicationforsolidrocketpropellant

2. Needforaperformancetestthatwouldbedefensible,not empiricalcorrelations

3. AASHTOTP107-14(2016)DeterminingtheDamageCharacteristicCurveofAsphaltMixturefromDirectTensionCyclicFatigueTests

4. Connectmixdesign,construction,andacceptancebymeansofdistressandperformanceprediction- notjustapass/failtest

WhyAMPTCyclicFatigueTest?

*RefertoETGPresentationatpreviousNEAUPGforsignificantlymoredetails

*

Page 8: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

5. Thetesttellsyoualotaboutyourmix!!!– Responseundermultiplestrains:

STRUCTURE/TRAFFIC– Responseundermultipleloadrates:TRAFFIC– Responseundermultipletemperatures:SEASONAL– Moreinformationgainedfromthistestprotocoland

analysisthanfromothersingletestsatasinglerate/temperature

6. Connectmixdesign,construction,andacceptancebymeansofdistressandperformanceprediction- notjustapass/failtest

WhyAMPTCyclicFatigueTest?

Page 9: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

RAP/RASTaskForcewithinETG:• AASHTOPP78-17DesignConsiderationsforRAS• ImprovementstoM323Superpave Design

– Table2vsTable3requirementsandlimits– Definitions(PbRAP),references(MSCR&LTPPBind),appendices,editorial,andorganization

– RAPbinderratio(RAPBR)emphasiswithbindergradeadjustmentguidelines

– EvaluateblendedbinderpropertiestoalignwithPP78recommendations

– FuturegoaltoincorporatebothcombinedRAP&RASmaterialstogetheringuidance

ReclaimedAsphaltPavement(RAP)ReclaimedAsphaltShingles(RAS)

Page 10: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

ETGRAP/RASTaskForce

Focusonthebrittlenessoftheblended binder:• EstimatebrittlenessoftheblendedbinderwiththeBendingBeamRheometer(BBR)

ΔTc =Stiffnesscriticaltemp(S)– theRelaxationcriticaltemp(m-value)

• PreviousworkbyM.Anderson,T.Bennert,G.ReinkeindicatesthatwhenΔTc < -5°Cthereisasignificantlossofcrackingresistance.

Page 11: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

BalancedMixDesignTaskForce

• Threemainapproacheswereidentifiedforpotentialuse:

Fordetails,refertothe18Oct2017NEAUPG.pptprovidedbyShaneBuchanan

Page 12: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

BalancedMixDesignTaskForce

CurrentActivities• InformationOutreach

• PresentBMDconcepts• HighlightthebenefitofBMDconcepts

• FieldAcceptance• DefinevariousapproachesforacceptanceprotocolswithinaBMDapproach

Page 13: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

PerformanceRelatedSpecifications

“QAspecificationsthatdescribethedesiredlevelsofkeymaterialsandconstructionqualitycharacteristics thathavebeenfoundtocorrelatewithfundamentalengineeringpropertiesthatpredictperformance”

TransportationResearchCircularNumberE-C137GlossaryofHighwayQualityAssuranceTerms

Page 14: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

IdentifyAQCsandTargetValues

EstablishPerformanceCriteria

ModelPerformance

DesignAQCvs.As-ConstructedAQC

CompareAs-BuiltandAs-Designed

PayFactorTime

Design

Constructed

SOFTWARE

Value of Performance?

HowPRSWorksPlanning

PavementDesign

Page 15: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

BenefitsofPRS

• Longtermpavementperformancepredictedfromfundamentalengineeringproperties

• Incentivesanddisincentives justifiedthroughreductionorincreaseinpavementlife

• Allowcontractorsflexibilitytobeinnovative andcompetitive

Page 16: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

PRSInitiative

• Useoffundamentalteststocapturevariancebetweenas-designedandas-builtAQCs

• AsphaltMixturePerformanceTester(AMPT)usedinmixturedesign

• Performancevolumetricrelationshipsusedinconstruction

• Structuralresponsemodel(stressesandstrains)

Page 17: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

PRSInitiative

• Fundamental– Howmuchdistress?Howmuchlife?– Stressesandstrains– Materialproperties(i.e.,modulus)– Usewithstructuralresponsemodel– Manytemperature/loadingconditionsrepresented

• Index-Based– Go/no-go:correlation-based– Someengineeringproperties,someempirical

• Moretiedtoamaterialdatabase– Notusedwithastructuralresponsemodel(FlexPAVE)– Onlyafewtemperature/loadingconditionsrepresented

FHWAPRS

Cost-efficientwaytoaccountforrelevantdistress!!

Page 18: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

FlexMATTM andFlexPAVETM Available

• FlexMATTM – Excelspreadsheet– Analyzescyclicfatigue,|E*|,andSSRdata– Importfilesdirectly– Outputà FlexPAVETM

• FlexPAVETM – performancepredictiontool– PEMDthroughacceptance– Simulateas-designandas-builtperformance

Page 19: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

FlexMATTM andFlexPAVETM Available

• FlexMATTM – Excelspreadsheet– Analyzescyclicfatigue,|E*|,andSSRdata– Importfilesdirectly– Outputà FlexPAVETM

• FlexPAVETM – performancepredictiontool– PEMDthroughacceptance– Simulateas-designandas-builtperformance

PredictsPerformance!!

Page 20: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

MaterialBehaviorAcrossAllLoadingConditions

• Time-temperaturesuperposition– Majorbenefit– Reducestestingtime– Enablesrobustnessofmodels

• Fundamentalpropertiesrequiredtodescribebehavioracrosswide-rangeofconditions

• Allowsfordirectincorporationofpavementstructureintopredictions

Page 21: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

MaterialBehaviorAcrossAllLoadingConditions

• Time-temperaturesuperposition– Majorbenefit– Reducestestingtime– Enablesrobustnessofmodels

• Fundamentalpropertiesrequiredtodescribebehavioracrosswide-rangeofconditions

• Allowsfordirectincorporationofpavementstructureintopredictions

Page 22: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

FHWAisworkingwiththeAsphaltInstitutetoassistStatestoeffectivelyunderstandandimplementMSCR.• TechnicalBriefFHWA-HIF-11-038

– www.fhwa.dot.gov/pavement/asphalt/index.cfm

• ResourcespostedonAI’swebsite– www.asphaltinstitute.org/public/engineering/mscr-information.dot

MultipleStressCreepRecovery(MSCR)

Page 23: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

• AASHTOT350-14andM332-14• EmphasisondeterminingJnrdiff

– Jnr changewithstressincrease– ImpactofstressselectiononJnr whilestayingwithinthebinder’slinearrange

– Jnr slopedetermination– EgradeJnrdiff waiver

MSCR Jnrdiff TaskForce

Page 24: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

• ExtensivedevelopmentworkconductedonrubbermodifiedbinderwithCCgeometry– Revealsthepracticalandrheologicalchallenges– SuitablemeasuringgeometryforPGmeasurementsofgroundtirerubbermodifiedasphaltbinders

– Finalizedtooldimensionsandrequirements• DSR…concentriccylindergeometryalsocalled“Cup&Bob”geometry– “requiredtoenablegoodrheology!”…“Gapsizematters!”

DSRConcentricCylinder(CC)TaskForce

Page 25: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

Smallcylinderinsideabigcylinderenablestheuseoflargegaps

AbsoluteRelative CC17SPGap≈6.2mmSuitableforneatandRTFOasphaltbinder(highPGtemperatures)

CC10SPGap≈9.5mmSuitableforPAVasphaltbinder(intermediatePGtemperatures)

CourtesyofA

nton

Paar

Page 26: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

DraftAASHTOteststandarddevelopment• TPXX-YYDeterminingtheRheologicalPropertiesofAsphaltBinderContainingGroundTireRubberParticulatesUsingConcentricCylinderGeometryintheDynamicShearRheometer(DSR)– PGHightemperaturecharacterization– Proceduretocalibrate/verifytorqueandtemperature

• Future– RTFOagingandBBRtesting

DSRConcentricCylinder(CC)TaskForce

Page 27: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

TaskForcewithinETG• Draftwhitepaperfinalized(tobepublished)• Whichrheologicalparameter

– criticaltemperaturechange(ΔTc)– Glover-Rowe(GR)– rheologicalindex(Rvalue)– crossoverfrequency(ωc)

• Alloftheseparameterscanbeinterrelatedfromunderstandingtherelationshipbetweenloadingtime(orfrequency)andtemperature.

Re-refinedEngineOilBottoms(REOB)VacuumTowerAsphaltExtender(VTAE)

Page 28: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

Focusonthebrittlenessoftheblended binder:• EstimatebrittlenessoftheblendedbinderwiththeBendingBeamRheometer(BBR)

ΔTc =Stiffnesscriticaltemp(S)– theRelaxationcriticaltemp(m-value)

• PreviousworkbyM.Anderson,T.Bennert,G.ReinkeindicatesthatwhenΔTc < -5°Cthereisasignificantlossofcrackingresistance.

ΔTc andrelatedrheologicalparameters

Page 29: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

• Current20hourPAVdoesnotrepresentenoughagingtoidentifycriticalconditionsortomatchfieldagingbypavements

• 40hourPAVcorrelatedwithperformance• Optionsforachievingadditionalagingarebeingexplored– Thinnerasphaltfilms

• PAVorUSAT(UniversalSimpleAgingTest)

– PredictedΔTc fromdifferencebetween:• Rateofchange:originalbindertoRTFOTto20hourPAV

ΔTc andrelatedrheologicalparameters

Page 30: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

• Otherparametersthatprovidesimilarinfo?– AgingdecreasesΔTc,increasesR-value,decreasescrossoverfrequency,andincreasescrossovertemperature

• RelationshipbetweenΔTc andTwc– Crossovertemperature(Twc)– measuredat10radians/secwherethephaseangleis45°ortand =1

– Twc iseasytomeasureonRTFOagedbinder

ΔTc andrelatedrheologicalparameters

Page 31: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

• Laboratoriesroutinelyconfusebarometricpressurewiththebarometricpressurereportedbythelocalweatherstation– Barometricpressurereportedbylocalweatherstationiscorrected tosealevel

• Uselessforourpurposes!

– Absolutevacuumgageshouldbespecified– Tievacuumleveltoelevation

PAVDegassing

Page 32: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

Whenusingavacuumgagetocontrolthedegassingpressure,thegaugereadingsgivenbyEq.4calculatedusingthelaboratoryelevationtothenearest100feetshallbeusedtocontrolandreportthevacuumduringthedegassingcycle.Equation4accountsforchangesinatmosphericpressurewithelevation.Noadditionalcorrectionsforlaboratorybarometricpressure,temperature,humidity,etc.shallbeappliedtothevacuumgagereadingregardlessofinstructionssuppliedbyanyvendors,instrumentsoftware,orothersource.Thevacuumgagereadingshallbereportedandcontrolledtothenearest0.5inHg(0.2kPa).

PAVDegassing- Proposal

Page 33: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

• TheabsolutepressurecalculatedinaccordancewithEq.4shallbe5.0±0.50inchesofmercury(17± 1.7kPa).

• Asaminimumthegageshallbereadandreportedtothenearest0.5inchesHg(2kPa)

PAVDegassing- Proposal

Page 34: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

1.Howcanwemeasurepanflatness?a. Currenttechniquesarenotsatisfactory

2.Howdoweobtaindirectmeasureofflatness?a. Profileisneeded

3.Howdotypicalpanflatnesserrorsaffecttestresults?a. Ifflatnessandpropertyvs.thicknessdata

areavailable,itcanbeestimatedb. Determinedexperimentallybyusing

warpedpans

PAVPanWarping

Page 35: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

4. Howcanwemeasurepanflatnessinspecificationscenario?

5. Whatarerealisticlimitsforspecifyingpanflatness?

PPAVPanWarping

MeasuringjigandphotoprovidedbyDr.DavidAnderson

Page 36: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

• Pandividedinto28segments• Profilemeasuredatcentroidofeachprofile

• Propertiesforeachsegmentcanbeweightedaslongaseffectofthicknessonpropertiesisknown

• Canalsoestimateeffectofpanandvessellevelness

ProfilingandCalculatedEffect

Page 37: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

ProfilingandCalculatedEffect

CourtesyofDr.DavidAnderson

Page 38: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

• A1%increaseinfielddensity(1%lessairvoids)canincreaseasphaltpavementservice-life10+%!(conservatively)

• Today’scompactiontargetistypically92%ofmaximum(Gmm )(8%airvoids),withvaryingrequirementsfortheareanearthelongitudinaljoint

EnhancedDurabilitythroughIncreasedIn-PlacePavementDensity

IncreasedDensityPavementstargeta1-2%increaseacrosstheentirepavement!

– Just1%more…makesahugedifference!

Page 39: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

CA

AZ

CO

NM

TX

OK AR

LA

MO KY

AL GA

FL

VA

OH

MI

AK

MT

NV

MEWA

OR

UT

KS

ID

WY

ND

SD

MN

NE

WI

IA

IL IN

MS

TNSC

NC

WV

PA

NY

CTNJDEMD

DCHI

Key:

PR

Demonstration projects (10)

EnhancedDurabilityofAsphaltPavementsthroughIncreasedIn-Place

PavementDensity

Workshop Only (18)

Mobile AsphaltTesting Trailer (2)

EasternFederalLands

Page 40: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

• Fieldexperiment– Phase1– 10statesselected– Projectscompletedin2016

• Extendfieldexperiment– Phase2– 9statesselected– Projectsunderconstructionin2017andearly2018

• Potentialadditionalfieldprojectsin2018?• FHWA’sbestpracticescommunication

– Summarydocument– TechBrief– Additionalworkshops(fundingdependent)

NextSteps

Page 41: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

CA

AZ

CO

NM

TX

OK AR

LA

MO KY

AL GA

FL

VA

OH

MI

AK

MT

NV

MEWA

OR

UT

KS

ID

WY

ND

SD

MN

NE

WI

IA

IL IN

MS

TNSC

NC

WV

PA

NY

CTNJDEMD

DCHI

Key:

PR

Demonstration projects (10)

EnhancedDurabilityofAsphaltPavementsthroughIncreasedIn-Place

PavementDensity

Workshop Only (18)

Mobile AsphaltTesting Trailer (2)

EasternFederalLands

Ph. 2 Demonstration (9)

Page 42: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

SummaryDocument

http://eng.auburn.edu/research/centers/ncat/files/technical-reports/rep17-05.pdf

NCATReport17-05

“DemonstrationProjectforEnhancedDurabilityofAsphaltPavementsthroughIncreasedIn-placePavementDensity”- July2017

Page 43: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

Testsectionshadincreased%TMD:• 8of10statesachieved>1.0%increase• 7of10statesachieved>94.0%Gmm

• 6of10statesachieved>95.0%Gmm

Willtherebechanges?• 7of10statesarechangingspecifications

Canweachieveincreaseddensity?

Page 44: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

• MobileAsphaltPavementMaterialsLab– SiteVisits– FieldData/Testing/Evaluation– Use/DemoEmergingTestDevices– POC:MatthewCorriganand

DavidMensching

FHWAFieldSupportMobileAsphaltTestingTrailer(MATT)

Page 45: Asphalt Expert Task Group Update and Emerging Topics...RAP/RAS Task Force within ETG: • AASHTO PP 78-17 Design Considerations for RAS • Improvements to M 323 Superpave Design –

You!!Thank Discussion/Comments/Questions

FHWA’sMobileAsphaltTestingTrailerOfficeofAssetManagement,Pavement,andConstruction

www.fhwa.dot.gov/pavement/asphalt


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