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Pavement Design. CEE 320 Anne Goodchild. Pavement: Noun a paved road, highway, etc. a paved surface, ground covering, or floor. material used for paving Sidewalk Pave: Verb

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pavement design

Pavement Design

CEE 320Anne Goodchild

dictionary com
  • Pavement: Noun
    • a paved road, highway, etc.
    • a paved surface, ground covering, or floor.
    • material used for paving
    • Sidewalk
  • Pave: Verb
    • to cover or lay (a road, walk, etc.) with concrete, stones, bricks, tiles, wood, or the like, so as to make a firm, level surface.
    • noun 2.Southern Louisiana. a paved road
what is pavement wikipedia
What is Pavement: Wikipedia
  • Pavement (material), the durable surfacing of roads and walkways ("road surface" in British English)
  • Sidewalk, a walkway along the side of a road, in American English ("pavement" in British English and Philadelphia dialect)
  • Pavement (architecture), a floor-like stone or tile structure
  • Pavement (band), an indie rock band from Stockton, California
  • Pavement (magazine), a youth culture magazine, published in New Zealand
  • Pavement Records, a record label
  • Portuguese pavement, the traditional paving used in most pedestrian areas in Portugal ("Calçada Portuguesa" in Portuguese)
  • Road surface marking, highway surface markings intended to convey information
  • Limestone pavement, a naturally occurring level outcrop
  • Tessellated pavement, a rare sedimentary rock formation that occurs on some ocean shores
  • Pavement Purpose
  • Pavement Significance
  • Pavement Condition
  • Pavement Types
    • Flexible
    • Rigid
  • Pavement Design
  • Example
pavement purpose
Pavement Purpose
  • Load support
  • Smoothness
  • Drainage
  • All weather operation
  • Direction andguidance

DC to Richmond Road in 1919 – from the Asphalt Institute

pavement significance
Pavement Significance
  • How much pavement?
    • 4 million centerline miles in U.S.
    • 2.5 million miles (63%) are paved
    • 8.37 million lane-miles total
    • Largest single use of HMA and PCC
  • Costs
    • $20 to $30 billion spent annually on pavements
    • Over $100 million spent annually in WA
    • Many states over billion dollar budgets
interstate highway system8
Interstate Highway System
  • Largest highway system in the world
  • Largest public works project in history
  • Started construction in 1956
  • 90% federal, 10% state funding
  • Owned built and operated by states
  • Construction and maintenance costs primarily provided by fuel tax
  • Pavement Interactive
  • State DOTs
pavement design procedures
Pavement Design Procedures
  • Asphalt Institute method
  • National Stone Association procedure
  • Shell procedure
  • AASHTO Guide for Design of Pavement Structures – American Association of State Highway and Transportation Officials
    • First published in 1972
what makes it difficult
What makes it difficult
  • Construction process control
  • Material variations
  • Exposed environment
    • Temperature and weather variability
  • Transportation of materials
  • Cost of materials
  • Unkown traffic loads
pavement types
Pavement Types
  • Flexible pavements
    • Asphalt
  • Rigid pavements
    • Concrete
pavement types13
Pavement Types
  • Want to distribute the load to avoid permanent deformation
vehicle loads
Vehicle loads
  • Typical vehicle weighs about 3500 lb, tire pressures around 35 lb/in2
  • Truck can weigh up to 80,000 lb with tire pressure of 100 lb/in2
  • Trucks and busses present a much more significant load on the pavement.
vehicle volume
Vehicle Volume
  • Pavements have a design life, and fail after cumulative vehicle exposure.
  • Volume of vehicles and prediction of vehicle volume is fundamental to pavement design.
pavement condition19
Pavement Condition
  • Defined by users (drivers)
  • Develop methods to relate physical attributes to driver ratings
  • Result is usually a numerical scale
serviceability concept
Pavements degrade over time due to

Exposure to traffic


Exposure to elements

Different for different materials and different construction methods

Serviceability Concept
pavement types22
Pavement Types
  • Flexible Pavement
    • Hot mix asphalt (HMA) pavements
    • Called "flexible" since the total pavement structure bends (or flexes) to accommodate traffic loads
    • About 82.2% of paved U.S. roads use flexible pavement
  • Rigid Pavement
    • Portland cement concrete (PCC) pavements
    • Called “rigid” since PCC’s high modulus of elasticity does not allow them to flex appreciably
    • About 6.5% of paved U.S. roads use rigid pavement
flexible pavement
Flexible Pavement

Base: higher strength material than subbase, often a cementing material is used.

Cementing material can be portland cement or asphaltic cement, or other material.

flexible pavement24
Flexible Pavement
  • Structure
    • Surface course (waterproof, anti-skid)
    • Base course
    • Subbase course
    • Subgrade
types of flexible pavement
Types of Flexible Pavement




rigid pavement27
Rigid Pavement
  • Structure
    • Surface course
    • Base course
    • Subbase course
    • Subgrade
types of rigid pavement
Types of Rigid Pavement
  • Jointed Plain Concrete Pavement (JPCP)

Joints accommodate shrinkage during drying.

types of rigid pavement29
Types of Rigid Pavement
  • Continuously Reinforced Concrete Pavement (CRCP)

Photo from the Concrete Reinforcing Steel Institute