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$18 Million Benefits of $18 Million Benefits of Using Ground Tire Using Ground Tire Rubber In Asphalt:Rubber In Asphalt:
Eleven Years of Eleven Years of SuccessSuccess
George Way, P.E.George Way, P.E.
Arizona DOTArizona DOT
Flagstaff I-40Flagstaff I-40
Elev. 2133 MetersElev. 2133 Meters
254 cm of snow254 cm of snow
Lowest Temp. -31 CLowest Temp. -31 C
I-40 TrafficI-40 Traffic
20,000 VPD20,000 VPD
35% Trucks35% Trucks
2.3 million 2.3 million ESAL’s/YearESAL’s/Year
Riordan ProjectRiordan Project
Built 1985Built 1985
25 cm HMA25 cm HMA
15 cm Perm HMA15 cm Perm HMA
15 cm Drainable AB15 cm Drainable AB
RIORDAN CROSS SECTIONRIORDAN CROSS SECTION
28 cm AC28 cm AC
15 cm BTB15 cm BTB
10 cm AB10 cm AB
Eng. FabricEng. Fabric
Sub GradeSub Grade
Built 1969Built 1969
20 cm PCCP20 cm PCCP
18 cm CTB18 cm CTB
Clay/Cinder SubgradeClay/Cinder Subgrade
I-40 PavementI-40 Pavement
Badly CrackedBadly Cracked
Rough RideRough Ride
High MaintenanceHigh Maintenance
Flagstaff OverlayFlagstaff Overlay
Crack & SeatCrack & Seat
7.5 cm HMA7.5 cm HMA
5 cm AR-HMA5 cm AR-HMA
1.25 cm AR-OGFC1.25 cm AR-OGFC
FLAGSTAFF CROSS SECTIONFLAGSTAFF CROSS SECTION
1.25 cm AR-OGFC1.25 cm AR-OGFC
5 cm AR-AC5 cm AR-AC
7.5 cm AC7.5 cm AC
PCCP Crack & SeatPCCP Crack & Seat
Sub GradeSub Grade
Arizona D.O.T , Materials GroupAR-AC & AR-ACFC GRADATION CHART
0
10
20
30
40
50
60
70
80
90
100
Sieve Sizes to .45 Power
% P
ass
ing
AR-AC
AR-ACFC
#200 #100 #50 #40 #30 #16 #10 #8 # 4 1/4” 3/8” 1/2” 3/4”
Asphalt RubberAsphalt Rubber
80 % Asphalt80 % Asphalt
20 % Ground Tire 20 % Ground Tire RubberRubber
Percent BinderPercent Binder
4.6% HMA/AC-204.6% HMA/AC-20
6.6% AR-HMA6.6% AR-HMA
9.0% AR-OGFC9.0% AR-OGFC
Metric Ton of MixMetric Ton of Mix
Mix Type K gs ofAsphalt
K gs ofRubber
HMA 42 0
AR-HMA 48 12
AR-OGFC 66 16
HMA-Asphalt HMA-Asphalt BinderBinder
AC-20AC-20
PG 64-16PG 64-16
Asphalt Rubber Asphalt Rubber BinderBinder
AC-10AC-10
PG 58-22PG 58-22
SHRP SPS-6
National Overlay Study
Focus on Thickness
10 cm & 20 cm HMA Overlay
SHRP SPS-6SHRP SPS-6Overlay PCCPOverlay PCCP
20 cm HMA 20 cm HMA
10 cm HMA10 cm HMA
5 cm AR-HMA/5 cm 5 cm AR-HMA/5 cm HMAHMA
CrackingCracking
• Flagstaff Flagstaff ARAR
• RiordanRiordan
0
2
4
6
8
10
12
1st
Yea
r
4th
Yea
r
7th
Yea
r
9th
Yea
r
FlagstaffRiordan
Cracking in MetersCracking in Meters
050
100150200250300350
1stYear
4thYear
7thYear
9thYear
AR-HMA8"-HMA4"-HMA
Percent CrackingPercent Cracking
0
2
4
6
8
10
12
1styear
4thyear
7thyear
9thyear
AR-HMAAR-SHRP8"-HMA4"-HMARiordan
Benefits of ARBenefits of AR
$18 million savings$18 million savings
Four Years Less Four Years Less Construction TimeConstruction Time
ImplementationImplementation
Over 2,500 miles of AR Over 2,500 miles of AR projects built since projects built since
19901990