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WMA Technical Working Group WMA Technical Working Group (WMA TWG)(WMA TWG)

Formed in 2005Formed in 2005Purpose:Purpose:

Promote Technology TransferPromote Technology TransferFacilitate Product Approval Facilitate Product Approval MethodsMethodsEncourage ResearchEncourage ResearchDevelop Quality and Environmental Testing Develop Quality and Environmental Testing ProtocolsProtocolsProvide Guidelines for Mix Design and Provide Guidelines for Mix Design and ConstructionConstructionIdentify Other Benefits of WMAIdentify Other Benefits of WMA

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WMA Technical Working Group WMA Technical Working Group (WMA TWG)(WMA TWG)

2 - 3 meetings annually2 - 3 meetings annuallyMay 6, 2008May 6, 2008

WMA Guide Specification for Highway Const.WMA Guide Specification for Highway Const.

December 11-12, 2007December 11-12, 2007Current Technology Overview and UpdatesCurrent Technology Overview and UpdatesPlant Setup, Operations, and EfficiencyPlant Setup, Operations, and EfficiencyResearch ActivitiesResearch ActivitiesSelect Project ExperiencesSelect Project ExperiencesWMA European Scan TourWMA European Scan Tour

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www.warmmixasphalt.comwww.warmmixasphalt.comMaterial Testing FrameworkMaterial Testing FrameworkEmission Testing FrameworkEmission Testing FrameworkWMA Best Practices DocumentWMA Best Practices DocumentResearch Needs IdentifiedResearch Needs Identified

Developed three (3) research statementsDeveloped three (3) research statementsSubmitted through AASHTO to NCHRPSubmitted through AASHTO to NCHRP• All projects highly ranked by SCORAll projects highly ranked by SCOR• Total $1.4 millionTotal $1.4 million

WMA TWG AccomplishmentsWMA TWG Accomplishments

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NCHRP Research ProjectsNCHRP Research Projects

NCHRP Project 09-43NCHRP Project 09-43““Mix Design Practices for Warm Mix Asphalt”Mix Design Practices for Warm Mix Asphalt”

$500,000.$500,000.0000

Principal Investigator:Principal Investigator:

Dr. Ramon Bonaquist, Dr. Ramon Bonaquist, Advanced Asphalt Technologies, LLCAdvanced Asphalt Technologies, LLC

Completion Date: Completion Date:

March 2010March 2010http://www.trb.org/TRBNet/ProjectDisplay.asp?ProjectID=977http://www.trb.org/TRBNet/ProjectDisplay.asp?ProjectID=977

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NCHRP Research ProjectsNCHRP Research Projects

NCHRP Project 09-47NCHRP Project 09-47““Engineering Properties, Emissions, and Field Engineering Properties, Emissions, and Field Performance”Performance”$900,000.$900,000.0000

Principal Investigator: TBDPrincipal Investigator: TBDCompletion Date: Completion Date: not to exceed 42 monthsnot to exceed 42 monthshttp://www.trb.org/TRBNet/ProjectDisplay.asp?ProjectID=1625http://www.trb.org/TRBNet/ProjectDisplay.asp?ProjectID=1625

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Binder ETG Research ProjectsBinder ETG Research Projects

Laboratory Evaluation: Wax Additives in Laboratory Evaluation: Wax Additives in Warm-Mix Asphalt BinderWarm-Mix Asphalt BinderEvaluate the effect of wax additives on Evaluate the effect of wax additives on physical properties and characteristics of physical properties and characteristics of asphalt binders and their subsequent asphalt binders and their subsequent performance in mixtures.performance in mixtures.

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Binder ETG Research ProjectsBinder ETG Research Projects

Asphalt – One (1)Asphalt – One (1)Lion Oil PG64-22 Eldorado, AR RefineryLion Oil PG64-22 Eldorado, AR Refinery

Wax Additives – Nine (9)Wax Additives – Nine (9)Non-Paraffin Wax AdditivesNon-Paraffin Wax Additives

AggregatesAggregatesVulcan Barin Quarry Granite, Columbus, GAVulcan Barin Quarry Granite, Columbus, GA

Mix DesignMix Design12.5mm Dense Graded SuperPave Gyratory 12.5mm Dense Graded SuperPave Gyratory • ~5.5% Binder~5.5% Binder• ~7.0% Air Voids~7.0% Air Voids

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Binder ETG Research ProjectsBinder ETG Research Projects

Fourier Transform Infra-Red Spectroscopy Fourier Transform Infra-Red Spectroscopy Gel Permeation ChromatographyGel Permeation ChromatographyGlass Transition (Tg)Glass Transition (Tg)BranchingBranchingPhysical Hardening (32 days saturation at Physical Hardening (32 days saturation at -12°C) Bending Beam Rheometry-12°C) Bending Beam RheometryTesting at 1,2,4,8,16 and 32 DaysTesting at 1,2,4,8,16 and 32 DaysMulti-Step Creep Recovery (MSCR)Multi-Step Creep Recovery (MSCR)Binder Stress Sweep FatigueBinder Stress Sweep FatigueAdditional testing … etc.Additional testing … etc.

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International WMA ConferenceInternational WMA Conference

FHWA, AASHTO, NAPA sponsoredFHWA, AASHTO, NAPA sponsored

November 11-13, 2008 in Nashville, TNNovember 11-13, 2008 in Nashville, TN

Features:Features:ProcessesProcesses

Mix Production & PlacementMix Production & Placement

Energy consumptionEnergy consumption

Mix DesignMix Design

Material PropertiesMaterial Properties

Environmental PerformanceEnvironmental Performance

EngineeringEngineering

State of the PracticeState of the Practice

Future DirectionFuture Direction

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Warm Mix Asphalt: Best PracticesWarm Mix Asphalt: Best Practices

Quality Improvement Series Quality Improvement Series (QIP) 125(QIP) 125

Stockpile Moisture Stockpile Moisture ManagementManagement

Burner Adjustments and Burner Adjustments and EfficiencyEfficiency

Aggregate Drying and Aggregate Drying and Baghouse TemperaturesBaghouse Temperatures

Drum Slope and FlightingDrum Slope and Flighting

Combustion AirCombustion Air

RAP usageRAP usage

Placement ChangesPlacement Changes

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WMA European Scan TourWMA European Scan Tour

Joint Program w/ Joint Program w/ FHWA, AASHTO,FHWA, AASHTO,NCHRP and IndustryNCHRP and IndustryPublicationPublicationFHWA-PL-08-007FHWA-PL-08-007Scan Final ReportScan Final Report

Electronic copyElectronic copy.pdf available at.pdf available at

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WMA European Scan ConclusionsWMA European Scan Conclusions

There is a consensus among the WMA There is a consensus among the WMA SCAN Team that WMA is a viable SCAN Team that WMA is a viable technology. U.S. Agencies and the HMA technology. U.S. Agencies and the HMA Industry need to cooperatively pursue this Industry need to cooperatively pursue this path.path.

The U.S. has already made great strides The U.S. has already made great strides in evaluating WMA, thanks in part to in evaluating WMA, thanks in part to Public-Private Partnerships like the WMA Public-Private Partnerships like the WMA TWG and the WMA SCAN Tour.TWG and the WMA SCAN Tour.

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FHWA working in partnership with FHWA working in partnership with AASHTO and Industry to established AASHTO and Industry to established clear targets for implementationclear targets for implementationWMA Technical Working Group (TWG)WMA Technical Working Group (TWG)FHWA Expert Task GroupsFHWA Expert Task Groups

Binder, Mixture, and ModelsBinder, Mixture, and Models

Regional User-Producer GroupsRegional User-Producer GroupsShare data and informationShare data and information

Move out of demonstration phaseMove out of demonstration phaseTraining and EducationTraining and Education

WMA Investigation and WMA Investigation and ImplementationImplementation

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