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Title:

Pavement Distresses Flexible Pavement

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The asphalt pavement layers experience high strains when the underlying layers are weakened by excess moisture and fail prematurely in fatigue. – PowerPoint PPT presentation

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Title: Pavement Distresses Flexible Pavement


1
Pavement DistressesFlexible Pavement
Sponsored by Minnesota LTAP Center Presented
by Michael Marti, P.E. SRF Consulting
Group, Inc. Dan Wegman, P.E. SemMaterials
2
Various Rating Manuals
  • Pavement Rehabilitation
  • A Guide for Minnesota Cities and Counties
  • MN LRRB
  • Distress Identification for the Long Term
    Pavement Performance Program
  • SHRP

3
Identifying the Distress is the 1st Step in the
Process
4
Identifying Distresses Includes
  • Name
  • Severity
  • Amount
  • Rate what you see and not what you think.

5
Cracking
  • Types
  • Fatigue
  • Thermal/Transverse
  • Block
  • Edge
  • Longitudinal
  • Reflection
  • Slippage

6
Fatigue Cracking
  • Causes
  • Insufficient strength
  • End of pavement life
  • Too heavy of loads
  • Cures
  • Remove and replace
  • Mill and overlay

7
Thermal Cracking (Transverse)
  • Causes
  • Contraction and Expansion of Pavement with
    Changing Temperatures
  • Cures
  • Crack Filling
  • Full-Depth Reclamation
  • Thick Overlay

8
Block Cracking
  • Causes
  • High Void Content
  • Oxidative Hardening of the AC
  • Thermal Cracking
  • Cures
  • Crack Filling/Sealing
  • Seal Coat
  • Full-Depth Reclamation
  • Thick Overlay

9
Edge Cracking
  • Causes
  • Soil Movement Beneath Pavement
  • Cures
  • Crack Filling/Sealing
  • Full-Depth Reclamation

10
Longitudinal Cracks
  • Causes
  • Low Temperatures
  • Cures
  • Crack Sealing
  • Thick Overlay

11
Reflective Cracking
  • Causes
  • Existing cracks or joints in the underlying
    structure
  • Concrete slab movements
  • Cures
  • Crack Filling
  • Extensive Pre-Overlay Repair
  • Rubblizing
  • Crack Seat
  • Saw Seal
  • Interlayer

12
Slippage Cracking
  • Description
  • U-shaped cracks in areas of braking, turning,
    accelerating
  • Causes
  • Poor bond between asphalt surface and underlying
    layer
  • Cures
  • Crack Filling/Sealing
  • Full-Depth Reclamation

13
Surface Defects
  • Rutting
  • Shoving
  • Bleeding
  • Polished Aggregate
  • Raveling
  • Potholes
  • Patching

14
Rutting
  • Causes
  • Low Air Voids
  • Asphalt content too high
  • Smooth, Rounded Aggregate
  • Excessive amounts of natural sand
  • Excess Dust
  • Cures
  • Remove/Replace 100 mm (4 inches)
  • Micro-surfacing

15
Shoving
  • Causes
  • Unstable Mix
  • Braking, stopping or accelerating traffic
  • Slippage between layers
  • Cures
  • Remove and Replace
  • Mill and Overlay
  • Thick Overlay

16
Bleeding
  • Causes
  • Too high asphalt content
  • too rich a plant mix
  • improperly constructed seal coat
  • too heavy prime or tack coat
  • Cures
  • Sand blot
  • Micro-surfacing
  • Seal coat

17
Polished Aggregate
  • Causes
  • Soft aggregate
  • Heavy traffic
  • Cures
  • Seal coat
  • Micro-surfacing
  • Thin Overlay

18
Raveling
  • Causes
  • Asphalt binder unable to hold aggregate in place
  • dusty aggregates
  • segregation
  • low in-place density
  • aged asphalt binder
  • Stripping
  • Cures
  • Seal Coat
  • Micro-surfacing
  • Thin Overlay

19
Potholes
  • Causes
  • Raveling of cracks
  • Moisture damage
  • Freeze-thaw
  • Insufficient strength
  • Cures
  • Patch

20
Patch Deterioration
  • Causes
  • Poor bonding to existing pavement
  • Improper compaction
  • Poor materials
  • Propagation of original distress
  • Cures
  • Remove and replace
  • Re-patch
  • Assess original distress

21
Miscellaneous Distresses
  • Lane-to-shoulder Drop off
  • Water Bleeding and Pumping

22
Lane to Shoulder Drop off
  • Cause
  • Differences in materials used for lane and
    shoulder
  • Differential settlement
  • Insufficient compaction of base
  • Cures
  • Wedge/leveling overlay
  • Micro-surfacing

23
Water Bleeding and Pumping
  • Causes
  • Cracks
  • Inadequate drainage
  • Cures
  • Full-depth patch
  • Crack seal
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