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National Institute of technology, Patna
GUIDED BY_
RANJA BANDYOPADHYAYA
ASSISTANT PROFESSOR
DEPARTMENT OF CIVIL ENGG.
PRESENTED BY –
DEVRAJ REGAR (1724013)
M.TECH 2nd SEM
Transportation Engineering
Study of Distress in flexible pavement
Introduction:_ Pavement
Rigid Pavement_
The design of Rigid pavement is
based on providing a structural
cement concrete slab of sufficient
strength to resists the loads from traffic.
Flexible Pavement_
The flexible pavement design is
based on the load distributing
characteristics of a layered system
Flexible pavements consist of a series of layers, with the highest quality materials at
or near the surface. The strength of a flexible pavement is a result of building up thick
layers and thereby distributing the load over the sub grade; the surface material does not
assume the structural strengths as with rigid pavements.
Advantage
• Adaptability to stage construction
• Availability of low-cost types that can be
easily built
• Ability to be easily opened and patched
• Easy to repair frost heave and settlement
• Resistance to the formation of ice glaze
Disadvantage
• Higher maintenance costs
• Shorter life span under heavy use
• Damage by oils and certain chemicals
• Weak edges that may require curbs or
edge devices
Distress in Flexible Pavement
• Surface Defects
Fatty surface
Smooth surface
Streaking Surface
hungry surface
• Cracks
Block Cracks
Alligator Cracks
Edge cracks
Longitudinal and transvers cracks
• Deformation
Rutting
Corrugation
Shoving
Settlement and upheavals
• Disintegration
Pumping
reveling
Pot holes
Polished Aggregate
Fatty surface Smooth surface
Streaking Surface Hungry surface
Surface Defects
Block Cracks Alligator Cracks
Edge cracks Longitudinal cracks
Cracks
Rutting Corrugation
Shoving Settlement and upheavals
Deformation
Pumping Raveling
Pot holes Polished Aggregate
Disintegration
Cause of Distress
Environmental
Cause
Traffic Cause Material Cause
These stress come under
pavement due to Env. factor
like moisture
These stress come under
pavement due to traffic like-
heavy load or high volume
traffic
These stress come under pavement
due to material quality Like low CBR
value, Optimum bitumen content
(OBC)
Distress in flexible pavement

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Distress in flexible pavement

  • 1. National Institute of technology, Patna GUIDED BY_ RANJA BANDYOPADHYAYA ASSISTANT PROFESSOR DEPARTMENT OF CIVIL ENGG. PRESENTED BY – DEVRAJ REGAR (1724013) M.TECH 2nd SEM Transportation Engineering Study of Distress in flexible pavement
  • 2. Introduction:_ Pavement Rigid Pavement_ The design of Rigid pavement is based on providing a structural cement concrete slab of sufficient strength to resists the loads from traffic. Flexible Pavement_ The flexible pavement design is based on the load distributing characteristics of a layered system
  • 3. Flexible pavements consist of a series of layers, with the highest quality materials at or near the surface. The strength of a flexible pavement is a result of building up thick layers and thereby distributing the load over the sub grade; the surface material does not assume the structural strengths as with rigid pavements. Advantage • Adaptability to stage construction • Availability of low-cost types that can be easily built • Ability to be easily opened and patched • Easy to repair frost heave and settlement • Resistance to the formation of ice glaze Disadvantage • Higher maintenance costs • Shorter life span under heavy use • Damage by oils and certain chemicals • Weak edges that may require curbs or edge devices
  • 4. Distress in Flexible Pavement • Surface Defects Fatty surface Smooth surface Streaking Surface hungry surface • Cracks Block Cracks Alligator Cracks Edge cracks Longitudinal and transvers cracks • Deformation Rutting Corrugation Shoving Settlement and upheavals • Disintegration Pumping reveling Pot holes Polished Aggregate
  • 5. Fatty surface Smooth surface Streaking Surface Hungry surface Surface Defects
  • 6. Block Cracks Alligator Cracks Edge cracks Longitudinal cracks Cracks
  • 7. Rutting Corrugation Shoving Settlement and upheavals Deformation
  • 8. Pumping Raveling Pot holes Polished Aggregate Disintegration
  • 9. Cause of Distress Environmental Cause Traffic Cause Material Cause These stress come under pavement due to Env. factor like moisture These stress come under pavement due to traffic like- heavy load or high volume traffic These stress come under pavement due to material quality Like low CBR value, Optimum bitumen content (OBC)