MODULE 1-2 Introduction to HMA Pavements. Learning Objectives Describe the types of (HMA) pavements...
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Transcript of MODULE 1-2 Introduction to HMA Pavements. Learning Objectives Describe the types of (HMA) pavements...
![Page 1: MODULE 1-2 Introduction to HMA Pavements. Learning Objectives Describe the types of (HMA) pavements Identify the role of each pavement layer Discuss key.](https://reader036.fdocuments.in/reader036/viewer/2022082613/5697bfbd1a28abf838ca1f4b/html5/thumbnails/1.jpg)
MODULE1-2
Introduction to HMA Pavements
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Learning Objectives
• Describe the types of (HMA) pavements
• Identify the role of each pavement layer
• Discuss key issues related to pavement performance
• Describe HMA pavement response to traffic and environmental loading
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• HMA
– with unbound (granular) base
– with bound (stabilized) base
– full-depth HMA
• Composite
– PCC/HMA
Types of HMA Pavements
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Wearing Course
Binder Course
Base Course (Bound or Unbound)
Subbase Course (Usually Unbound)
HMASurface
Subgrade Soil
Course Terminology
• Asphalt cement
• Hot-mix asphalt (HMA)
• Structure:
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Role of Pavement Layers
HMA Layer
Base Course
Subbase Course
Subgrade Soil
4 Roles:
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Pavement Performance
• Functional Performance
– Providing users a safe and comfortable ride
• Structural Performance
– Ability to withstand traffic and environmental loadings
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TrafficSubgrade
Soil
Materials C&MVariation
Environment
M&R
PAVEMENTPAVEMENTPERFORMANCEPERFORMANCE
Factors Affecting Pavement Performance
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HMA Pavement Response
• Stresses, strains and deformations resulting from wheel loads
• Changes in material properties resulting from changes in the environment
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Subgrade Soil
Subbase
Base
HMA Surface
WheelLoad
Rutting Mechanism
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Subgrade Soil
Subbase
Base
HMA Surface
WheelLoad
Fatigue Cracking Mechanism
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Location Along HMA Surface
ContractionHMA
Friction on Underside of HMA Surface
TensileStress
Crack orCold Joint
Crack orCold Joint
Surface
Tensile Strength
Thermal Cracking Mechanism
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200+ mmHMA
Surface
Oxidation PenetrationSurface-Initiated Crack
Interface Between Lifts
Top-Down Cracking Mechanism
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Separationof asphalt
binder from aggregate
Stripping Mechanism
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Subbase Course
HMA Overlay
Subgrade Soil
PCC Slab Underlying Joint
TensionShear
WheelLoad
Reflection Crack Mechanism
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• Frost heave
• Strength loss (due to moisture)
• Soil swelling
• Oxidation
Other Distress Mechanisms
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Other Key Topics(covered in text)
• HMA Materials
– Asphalt binder
– Modified asphalts
– Asphalt rubber
– Mineral aggregate
• Superpave Binder Specification
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Review• What are the different types of HMA
pavements?
• What is the role of each pavement layer?
• What is the difference between functional and structural performance?
• What are some of the important factors that affect pavement performance?
• What are some of the typical pavement distress mechanisms associated with HMA pavements?
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Key References• Yoder, E. J. and M. W. Witczak. 1975.
Principles of Pavement Design. Second Edition. John Wiley & Sons, New York, NY.
• American Association of State Highway and Transportation Officials (AASHTO). 1993. Guide for Design of Pavement Structures, American Association of State Highway and Transportation Officials, Washington, DC.