Pavement Design (with examples) | Complete Data

Pavement Design (with examples)

Outline

  1. Pavement Purpose
  2. Pavement Significance
  3. Pavement Condition
  4. Pavement Types
    1. Flexible
    2. Rigid
  5. Pavement Design
  6. Example

Pavement Purpose

pavement purpose

  • Load support
  • Smoothness
  • Drainage

Pavement Significance

  • How much pavement?

–        3.97 million Centerline miles in U.S.

–        2.5 million miles (63%) are paved

–        8.30 million lane-miles total

–        Largest single use of HMA and PCC

  • Costs

–        $20 to $30 billion spent annually on pavements

–        Over $100 million pent annually in WA

Pavement Condition

pavement condition

  • Defined by users (drivers)
  • Develop methods to relate physical attributes to driver ratings
  • Result is usually a numerical scale

Present Serviceability Rating (PSR)

PSR

Present Serviceability Index (PSI)

  • Values from 0 through 5
  • Calculated value to match PSR

       Design Parameters

  • Subgrade
  • Loads
  • Environment

 

Pavement Types

1.      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
  • About 95.7% of paved U.S. roads are surfaced with HMA

Its types:

  • Dense graded
  • Open-graded
  • Gap-graded
  1. 2.      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

It’s Types:

  • Jointed Plain Concrete Pavement (JPCP)
  • Continuously Reinforced Concrete Pavement (CRCP)

Pavement Design:

1. Design Catalog Method

design catalogue method

2. Empirical (1993 AASTHO)

Flexible:

flexible

 

 

 

 

Rigid:

 rigid

 

 

 

 

 

 

 

 

3. New AASTHO Method (as yet unreleased):

  • Mechanistic-empirical
  • Can use load spectra (instead of ESALs)
  • Computationally intensive
    • Rigid design takes about 10 to 20 minutes
    • Flexible design can take several hours

 

Power Point Presentation with solved examples has been embedded below for better understanding.

 

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