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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