Asphalt Rubber Research and Performance · Asphalt Rubber Research and Performance. ... AR Band...
Transcript of Asphalt Rubber Research and Performance · Asphalt Rubber Research and Performance. ... AR Band...
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Asphalt Rubber Research and Performance
George B. Way, P.E.Chairman RPA TAB
Retired from Arizona DOT after 35 Years
Asphalt-Rubber 101, The Basics of Rubberized Asphalt
El Paso, TexasJuly 24, 2008
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Charles McDonaldInventor of
Asphalt Rubber
McDonaldApplying
AR Band AidPatch
Circa 1966
Asphalt Rubber
Band Aid Patch
Circa 1966
Early Development
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Phoenix, Arizona failed streets in the 1960’s.McDonalds goal to maintain failed streets until reconstruction.
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Early Asphalt RubberSlurry Seal Application
Circa 1970
Early Asphalt RubberChip Seal Circa 1970
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Early Chip SealSpray ApplicationOf Asphalt Rubber
Circa 1975
Early Chip SealConveying
Crumb RubberInto Distributor Truck
Circa 1975
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By Early 1980’s Numerous Research Reports On Asphalt Rubber Seal Coats, SAM’s & SAMI’s
Documenting Reducing Reflective Cracking
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By 1985 AR Mix Design Research & Development, Gap Graded
& Open Graded
• Reduce Reflective Cracking• More Durable Surface• Reduce Raveling • Good Rut Resistance• Good Skid Resistance• Good performance in Hot & Cold Climates
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Cracking
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Raveling
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19901990’’s Development of AR Standards s Development of AR Standards Arizona and ASTMArizona and ASTM
80 percent Asphalt20 percent Ground Tire Rubber
Rubber & Asphalt Mixed together hot to form a binder
Binder pumped into plant and mixed with hot aggregate, hot mix paved as normal
Complies with ASTM 6114 Asphalt-Rubber Spec.
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AR Open Graded (ARFC) and Gap Graded (ARAC)Develop Standard Gradations
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HMA Dense GradedSurface
Asphalt Rubber Gap Graded Mix
Asphalt RubberOpen Graded Mix
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SHRP ResearchI-40 After
Asphalt RubberOverlay of Concrete
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ALF FHWA FatigueCracking Experiment
Performance ofModified Asphalts
2004
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AR PossibleOne million
1000000Passes
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Lane 1
CR-AZ
300,000
Lane 2
Control
100,000
Lane 3
Air Blown
100,000
Lane 4
SBS LG
300,000
Lane 5
CR-TB
100,000
Lane 6
TP
200,000
AsphaltRubber AC
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Smoothness IRI mm/km Inches/Mile
78
52
26
0
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Texas Research on Reduce Splash & Texas Research on Reduce Splash & SpraySpray
Open Graded Concrete
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Asphalt Rubber Friction CourseARFC
California & Arizona Research on NoiseAR Open Graded Quietest Surface
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HMA Dense Graded Average Overlay Thickness
140 mm – 5.5 Inches
Asphalt RubberHot Mixes
Average OverlayThickness
45 mm – 1.7 Inches
HMA % of MilesWith Fatigue Cracking
20 %
Asphalt Rubber % Of MilesWith Fatigue Cracking
2 %
Arizona Use of AR Mixes
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Arizona DOT Pavements SurfacedWith Asphalt Rubber since 1988
Asphalt RubberPaved Surfaces
1988-200720000 Lane Kilometers
About45 %
Of ADOTSystem Paved
WithAsphaltRubber
Over20
Million Tires
Recycled Since1988
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Arizona Arizona US
Asphalt AR Binder Barrel of Oil
Bid Price/Ton, US $ Bid Price/Ton, US $ Price in US $December 1994 140 264 17December 1995 135 255 20December 1996 140 285 20December 1997 135 277 20December 1998 130 245 17December 1999 155 255 20December 2000 210 275 26December 2001 219 285 26December 2002 212 270 26December 2003 203 250 26December 2004 198 264 42December 2005 244 311 55December 2007 416 514 84March 2008 423 500 110June 2008 500 550 134
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Arizona Arizona Percent
Asphalt AR Binder Difference
Bid Price/Ton, US $
Bid Price/Ton, US $
AR Greater Than Asphalt
December 1994 140 264 89December 1995 135 255 89December 1996 140 285 104December 1997 135 277 105December 1998 130 245 88December 1999 155 255 65December 2000 210 275 31December 2001 219 285 30December 2002 212 270 27December 2003 203 250 23December 2004 198 264 33December 2005 244 311 27December 2007 416 514 24March 2008 423 500 18June 2008 500 550 10
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Total Mix Costs in Dollars, June 2008Mix Bid Price per
TonCost per Square Yd/Inch
Cost per Square Meter/25 mm
HMADense
$79 $4.30 $4.66
ARACGap
$94 (+16%) $5.00 (+16%) $5.42 (+16%)
ACFCOpen
$75 $3.43 $3.72
ARFCOpen
$82 (+9%) $3.75 (+9%) $4.05 (+9%)
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Arizona Asphalt Rubber BenefitsArizona Asphalt Rubber Benefits
Less Reflective CrackingLess Maintenance/More DurableLess RavelingGood Rut ResistanceGood Skid ResistanceSmooth Ride, Less NoiseGood in hot & cold climatesLess Splash & Spray Better DrainageCost Effective, Energy EfficientGood Engineering Use for Old TiresASTM Standard Type Asphalt
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Then
NOW
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Lawrence of China?Gobi Desert George?
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Thank You