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Perpetual Pavement Design
John DAngelo
Federal Highway Administration
Washington, DC
Canadian User Producer Group for Asphalt
Saskatoon, Saskatchewan
Nov. 16th2008
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Appian way in Italy
Experienced based design
Build it thick
Build it with durable materialsIt will last
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Pavement Design
In a modern world can we afford to over
design?
Limited resources
Limited money
High demand
How do we design for just the right
performance?
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Fatigue Life
High Strain = Short Life
Low Strain = Long Life
Fatigue Theory
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Fatigue Cracking
Repeated
Bending
Leads to
Fatigue Cracking
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Repeated
Bending
Leads to
Fatigue Cracking
Fatigue Cracking
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0.00001
0.0001
0.001
0.01
1.0E+0
2
1.0E+0
4
1.0E+0
6
1.0E+0
8
1.0E+1
0
1.0E+1
2
1.0E+1
4
Load Cycles to 50% Stiffness (Failure)
Strain(St
rain/1E6)
?
Traditional Fatigue Plot
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High Strain = Short Life
Low Strain = Unlimited Life
Unlimited
Fatigue
Life
Fatigue Life
Fatigue Theory for
Thick Pavements
70
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FAILURE MODES
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Eventual Distress
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Goal of Perpetual Pavement Design
Design the structure such that there are no deepstructural distresses Bottom up fatigue cracking
Structural rutting
All distresses can be quickly remedied fromsurface
Result in a structure with Perpetual or LongLife
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Surface Distresses Only
Non-Structural Rutting
Top Down Cracking
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Dynamic Modulus Test
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Soil Modulus Testing
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Dynamic Cone Penetration
Rod
Reference
Mass
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FWD Testing
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Traffic
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Layer 1
HMA
E1
Layer 2
Granular Base
E2
Layer 3
Subgrade Soil
E3
h1
h2
No bottom boundary, assume soil goes on infinitely.
No
horizontal
boundary,assume
layers
extend
infinitely.
Tire has a total load P, spread over a circular
area with a radius of a, resulting in a contact
pressure of p.
Pavement
React ions
Deflection (d)
Tensile Strain (et)
Compressive Strain (ev)
Figure 2. Layered Elastic Model Representation of a Pavement.
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Perpetual Pavement Design
No Damage Accumulation
Log N
Log e
Threshold
Strain
French conceptHigh modulus
high binder content base.California concept- High strain
tolerance polymer asphalt base.
New approach- combine both with
stiff agg. base to reduce cost.
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New Jersey I-287
Surface Cracking
Solution: Mill 4 and
Overlay with 5
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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.
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References
