Maintenance Considerations in Design

1
Maintenance Considerations in Design

• Michael J. Kennerly P.E.
• Director of the Office of Design
• Iowa Department of Transportation

2
Key Considerations when Designing for
Maintainability

• Maintenance Policy
• Maintenance Staff
• In-House
• Outsourced
• Type of Equipment
• Maintenance Budget
• Rehabilitation Program
• Climate

3
Water, Water, Water
4
How Water Influences Design and Maintenance

• Water Management Affects
• Pavement Design
• Shoulder Design
• Subgrade Treatment
• Horizontal alignment
• Subdrain
• Ditching
• Landscaping

5
Pavement Design

• Typical Cross Section for 4-Lane Divided Highway

6
Pavement Design

• Pavement Design
• Thickness
• Subgrade Treatment
• Type HMA vs PCC
• Porous Pavement
• Rehabilitation Strategy

7
Shoulder Design

• Material
• Width
• Subgrade
• Subdrain
• Interface

8
Rehabilitation Strategies
9
Rehabilitation Strategies

• HMA Resurfacing Option

10
Roadside Design
Typical Ditch Section
11
Roadside Design

• What is The problem?

12
Roadside Design

• Snow Borrow

13
(No Transcript)
14
Roadside Features

• Light poles