perpetual pavements can it be used? • perpetual pavements are not just for highway projects •...
TRANSCRIPT
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Perpetual Pavements
North Dakota Asphalt Conference
Bismarck, ND
April 6, 2010
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Perpetual Pavement
• Not a new concept–Full-Depth–Deep Strength–Mill & Fill
MS-1
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Max Tensile Strain
Pavement Foundation
High ModulusRut Resistant Material(Varies As Needed)
Flexible Fatigue ResistantMaterial 3 - 4”
1.5 - 3” SMA, OGFC or Superpave
} 4”to6”
ZoneOf High
Compression
Perpetual Pavement Principles
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Fatigue and Rutting
RepeatedBending
Leads toFatigue Cracking
RepeatedDeformation
Leads toRutting
HMA
Base
Subgrade
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» Minimize Tensile Strain with Pavement Thickness
» Thin Asphalt Pavement = Higher Strain
» Higher Strain = Shorter Fatigue Life
CompressiveStrain
Tensile Strain
Strain
Fatigue Life
IndefiniteFatigue
Life
Thinner pavements – High Strain
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» Minimize Tensile Strain with Pavement Thickness» Thicker Asphalt Pavement = Lower Strain
» Strain Below Fatigue Limit = Indefinite Life
CompressiveStrain
Tensile Strain
Strain
Fatigue Life
IndefiniteFatigue
Life
Thicker pavements – Low Strain
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Mechanistic Performance Criteria
Under ESAL
Limit Bending to < 65με(Monismith, Von Quintus, Nunn,
Thompson)
Limit Vertical Compression to < 200με (Monismith, Nunn)
Thick HMA(> 8”)
Base (as required)
Subgrade
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› Bottom-up Design and Construction
› Foundation
» Stable Paving Platform
» Minimize Seasonal Variability and Volume
Change in Service
› Fatigue Resistant Lower Asphalt Layer
› Rut Resistant Upper Asphalt Layers
It starts with the Base
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» High Effective Asphalt Content Mixes = Greater Strain
Capability
» Modified Binders = Greater Strain Capability
Fatigue Life
Strain
High AsphaltContent
Low AsphaltContent
Indefinite Fatigue Life
Fatigue Resistant Asphalt Base
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• Aggregate Interlock» Crushed Particles
» Stone-on-Stone Contact
• Binder» High Temperature PG
» Polymers
» Fibers
• Air Voids» Avg. 4% to 6% In-Place
• Surface» Renewable
» Tailored for Specific Use
Rut Resistant Upper Layers
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• Rutting Occurs in Upper Asphalt Layers
• Full-Scale Tracks
» Mn/ROAD
» WesTrack
» NCAT
• Accelerated Pavement Testing
» CalAPT
» FHWA
Rut Resistant Upper Layers
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PavementFoundation
Rut ResistantMaterial(Varies)
Fatigue ResistantMaterial 3” to 4”
SMA, OGFC or SP 1.5 - 3”
Temperature
High Perf. PG Binder
Use proper PG Binder asdictated by climate and depth.
Impact of Temperature Gradient on Asphalt Grade.
Use proper PG Binder asdictated by climate and depth.
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Low Temperature Cracking
•Historical Performance
•Maintenance
•Maintain Mix Volumetrics
•Use proper Binder Grade
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New Jersey Turnpike
•First Perpetual Award Winner•Built in 1950•Has never been reconstructed•175,000 ADT•40% Trucks
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PAVEMENT DEFORMATION
ARAN average, 0.12”ARAN change, 0.04” (4 yr.)
Measurement, 1/8”
LOCATIONI-695, NBL,
Baltimore Beltway
COMPLETION DATE1993
19 mm GGAC-20 w/ fibers
TRAFFICAADT - 175,000Trucks - 19%
PERFORMANCE DATA - 1999
DENSITY, %MAXWheelpath Centerline
99.0 98.498.0 96.097.5 95.5
PG BINDER GRADE
70-22
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Perpetual Pavements in China
• Unregulated Loads• 150,000-250,000# + Loads • Will not purchase US or European Trailers
– Build their own to accommodate loads– Use our wheel/axle configuration
• Perpetual Pavement Design by John D 'Angelo’s Team
• ~15 inches
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Where can it be used?
• Perpetual Pavements are not just for highway projects• Many municipal pavements can also be designed as
Perpetual Pavements• Increasing the thickness of the hot mix layers by 25 to 35
percent will likely result in a perpetual pavement• There are tools to allow municipalities to look at
Perpetual Pavement options• PerRoad v3.3 and PerRoadXPress v1.0 are both
available free of Charge
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PerRoad 3.3
• Sponsored by APA• Developed at Auburn University / NCAT• M-E Perpetual Pavement Design and Analysis Tool
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Hot Off the Presses!
http://www.asphaltroads.org/documents/Perpetual_Pa
vement_Synthesis.pdf
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TRL Report 250Nunn, Brown, Weston
& Nicholls
Design of Long-Life FlexiblePavements for Heavy Traffic
http:\\www.trl.co.uk
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Source: Perpetual Asphalt Pavements – A Synthesis
Perpetual Pavement Award Winners
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Award Criteria
• Pavement must be a minimum of 35 years old.
• Pavement must have hot-mix or warm-mix asphalt binder and surface layers.
• No rehabilitation or series of rehabilitations over the preceding 35 years that has increased the total pavement thickness by more than 4 inches.
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Award Criteria
• Resurfacing intervals of no less than 13 years on the average.
• Minimum project length is two miles for all roadway types.
• In the case of “stage construction,” the 35-plus year time frame against which the award criterion is evaluated begins when all stage construction is completed.
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Tacked layers are very important
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150 mm
50 mm
Washington State - Top-Down in Asphalt Pavements > 150 mm
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M32
M32CORE
TRL
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Longitudinal
crack in
M1
TRL
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Perpetual Pavement
› Structure Lasts 50+ years.
» Bottom-Up Design and Construction
» Indefinite Fatigue Life
› Renewable Pavement Surface.
» High Rutting Resistance
» Tailored for Specific Application
› Consistent, Smooth and Safe Driving Surface.
› Environmentally Friendly
› Avoids Costly Reconstruction.www.AsphaltAlliance.com
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LCCA - Zero Salvage Value?
This was worth Zero 35 years ago, What will
it be worth in 2050?