oklahoma’s test section at ncat track amap 12 th annual conference western crown center hotel
DESCRIPTION
Oklahoma’s Test Section at NCAT Track AMAP 12 th Annual Conference Western Crown Center Hotel Kansas City, MO February 16, 2011. Kenneth Ray Hobson, P.E. –Bituminous Engineer. Topics. Test Sections – N8 and N9 History of Performance N8 Repairs Success vs. Failures Use of Knowledge. - PowerPoint PPT PresentationTRANSCRIPT
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Oklahoma’s Test Section at NCAT Track
AMAP 12th Annual ConferenceWestern Crown Center Hotel
Kansas City, MOFebruary 16, 2011
Kenneth Ray Hobson, P.E. –Kenneth Ray Hobson, P.E. – Bituminous Bituminous EngineerEngineer
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Topics
• Test Sections – N8 and N9
• History of Performance
• N8 Repairs
• Success vs. Failures
• Use of Knowledge
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OK Sections
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OK Sections
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2006 N8 and N9 History Perpetual Pavement Design
• N8 and N9 on Soft Clay Subgrade‒ N8: 10" HMA‒ N9 : 14" HMA
• RBL Bottom Lift for Both
• N9 - Successful
• N8 - Cracked
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• N9: Continue Traffic
• N8: Mill and Replace Top Two Lifts
• N8: Retard Cracking by Two Fabrics
2009 N8 and N9 History Retard Cracking
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N8 Reflective Cracking to RetardN8 Reflective Cracking to Retard
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N8 Cracking at 2.7 MESALs
0
2
4
6
8
10
12
25 50 75 100 125 150 175
Tra
nsv
erse
Off
set
(fee
t)
Longitudinal Distance from Far Transverse Joint (feet)
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Microstrain Comparison
N8 Strain = 21.487e0.0335*Temperature
R2 = 0.96
N9 Strain = 11.496e0.0298*Temperature
R2 = 0.9217
0
200
400
600
800
1000
1200
1400
0 20 40 60 80 100 120 140
Mid-Depth Temperature, F
Te
nsi
le M
icro
stra
in
N8 N9
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More Distress at 3.4 MESALs
0
2
4
6
8
10
12
25 50 75 100 125 150 175
Tra
nsv
erse
Off
set
(fee
t)
Longitudinal Distance from Far Transverse Joint (feet)
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June 16, 2010 Repair
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Terminal Distress at 3.8 MESALs
0
2
4
6
8
10
12
25 50 75 100 125 150 175
Tra
nsv
erse
Off
set
(fee
t)
Longitudinal Distance from Far Transverse Joint (feet)
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Observed Shear
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End of Section
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Shear Plane
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End of Section
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Reflective Crack
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Preliminary Forensic Results
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Additional Forensic Results
0
2
4
6
8
10
12
25 50 75 100 125 150 175
Tra
nsv
erse
Off
set
(fee
t)
Longitudinal Distance from Far Transverse Joint (feet)
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Final Forensic Results
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N8 Repair Two• Forensics Showed Extensive Subgrade
Deformation
• Significant Repair Needed
• Use Design Similar to N7 (7.5% SBS)
• Make Sublot 3 Similar to Sublot 1‒ 9.5 mm NMS and Add Binder
−Similar to RBL Concept
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2009 Group Experiment (+)
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N8 Repair Two Details
• NTSS-1HM Tack Coats 0.07 gal/SY
• Average Mill Depth of 5.8"
• Bottom Two Lift Total Thickness 4.7"‒ N8-1 Like N7-1, 1.2" Thick‒ N8-3 Like N8-1 Except 0.2% Binder Added
• N8-2 Like N7-2, 19 mm NMS
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N8 Repair Two Details
• N8-1 3.2% Air Voids, 91.4% Density
• N8-2 4.9% Air Voids, 94.2% Density
• N8-3 2.1% Air Voids, 94.3% Density
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Matt After Rain
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Matt on 1/21/2011
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Improved IRI and MTD
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Use of Knowledge
• Use Repair Concept on Interstate‒ NTSS-1HM Tack Coats 0.07 gal/SY‒ Use PG88-22 Binder for Top 3 Lifts‒ Top and Bottom Lifts (1 and 3)
-Use Superpave 9.5 mm NMS‒ Lift below Top Lift: Superpave 25 mm NMS‒ Use 50 SGC Gyrations for 9.5 mm NMS ‒ 2.0% Air Voids for Lift 3 (RBL Concept)
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Spring 2012 Repair SiteI-40 Mile Posts 102-104
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Acknowledgements
• Dr. R. Buzz Powell, P.E.
• Kraton Polymers LLC
• Jeff Dean, Pavement Engineer ODOT
• AMAP
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• http://pavetrack.com
• Subscribe Dixie Contractor‒ Fournier, Paul. Failed Test Track
Section Repaired. Dixie Contractor. Vol. 84 Number 12, Dec. 2010
• ODOT 2009 Standard Specifications
Questions?