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

• 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

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

Present Serviceability Rating (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

2. Empirical (1993 AASTHO)

Flexible:

 

 

 

 

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.

 

[google-drive-embed url=”https://drive.google.com/a/civildigital.com/file/d/0B-zZkuNv8PmwcE9hVERuVWpwQWM/preview?usp=drivesdk” title=”Pavement Design.ppt” icon=”https://ssl.gstatic.com/docs/doclist/images/icon_10_powerpoint_list.png” width=”100%” height=”400″ style=”embed”]