Cracks

1
Cracks
Flexible Pavement
2
Transverse Cracks
Flexible Pavement
3
Transverse Cracks

• Causes
• Temperature changes

Flexible Pavement
4
Transverse Cracks

• Causes
• Temperature changes
• Shrinkage of asphalt

Flexible Pavement
5
Transverse Cracks

• Cures
• Crack Seal
• Chip Seal
• Thin Overlay

Flexible Pavement
6
Block Cracks
7
Block Cracks

• Causes
• Aging and shrinking asphalt

8
Block Cracks

• Causes
• Aging and shrinking asphalt
• Frost action
• Heavy traffic

9
Block Cracks

• Cures
• Seal coating
• Overlays
• Reconstruction

10
Longitudinal Cracks
11
Longitudinal Cracks

• Causes
• Inadequate bonding

12
Longitudinal Cracks

• Causes
• Inadequate bonding
• Reflection cracks

13
Longitudinal Cracks

• Causes
• Inadequate bonding
• Reflection cracks
• Wheel track heavy load

14
Longitudinal Joint CrackingCenter Line

• Causes
• Inadequate bonding
• Reflection cracks
• Wheel track heavy load
• Alligator Crack insufficient thickness

15
Longitudinal Cracking

• Cures
• Crack Seal
• Strengthening with overlay
• Reconstruction
• Excavate rebuild
• Total reconstruction
• Improve drainage

Flexible Pavement
16
Edge Cracking
Flexible Pavement
17
Edge Cracking

• Causes
• Weakened sub-base at edge

Flexible Pavement
18
Edge Cracking

• Causes
• Weakened sub-base at edge
• Heavy loads

Flexible Pavement
19
Edge Cracking

• Causes
• Weakened sub-base at edge
• Heavy loads
• Poor pavement edge support

Flexible Pavement
20
Edge Cracking

• Causes
• Weakened sub-base at edge
• Heavy loads
• Poor pavement edge support
• Poor shoulder drainage

Flexible Pavement
21
Edge Cracking

• Cures
• Fill Seal Cracks

Flexible Pavement
22
Edge Cracking

• Cures
• Fill Seal Cracks
• Strengthen with overlay or reconstruction
• Widen lane or stabilize shoulders

Flexible Pavement
23
Rutting
Flexible Pavement
24
Rutting

• Causes
• Improper asphalt density

Flexible Pavement
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Rutting

• Causes
• Improper asphalt density
• Lack of compaction

Flexible Pavement
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Rutting

• Causes
• Improper asphalt density
• Lack of compaction
• Traffic and heat

Flexible Pavement
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Rutting

• Causes
• Improper asphalt density
• Lack of compaction
• Traffic and heat
• Weak subgrade

Flexible Pavement
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Rutting

• Cures
• Microsurfacing
• Mill Fill
• Overlay
• Subgrade reconstruction

Flexible Pavement
29
Corrugations
Flexible Pavement
30
Corrugations

• Causes
• Unstable asphalt mix

Flexible Pavement
31
Corrugations

• Causes
• Unstable asphalt mix
• Weak subgrade
• Traffic and heat

Flexible Pavement
32
Corrugations

• Cures
• Mill Fill
• Reconstruction

Flexible Pavement
33
Debonding
Flexible Pavement
34
Debonding

• Causes
• Improper compaction

35
Debonding

• Causes
• Improper compaction
• Poor tack coat

36
Debonding

• Causes
• Improper compaction
• Poor tack coat
• Insufficient layer thickness

37
Debonding

• Cures
• Partial depth patches
• Partial depth patches with microsurfacing
• Mill and overlay

38
Raveling
Flexible Pavement
39
Raveling

• Causes
• Improper compaction

Flexible Pavement
40
Raveling

• Causes
• Improper compaction
• Lack of density

Flexible Pavement
41
Raveling

• Causes
• Improper compaction
• Lack of density
• Uneven mixture

Flexible Pavement
42
Raveling

• Causes
• Improper compaction
• Lack of density
• Uneven mixture
• QC of gradation
• Clay in gravel

Flexible Pavement
43
Raveling

• Causes
• Improper compaction
• Lack of density
• Uneven mixture
• QC of gradation
• Clay in gravel
• Aging pavement, binders oxidized

Flexible Pavement
44
Raveling

• Cures
• Crack Sealing
• Chip Sealing
• Microsurfacing
• Thin Overlay
• Mill Fill

Flexible Pavement
45
Potholes
Flexible Pavement
46
Potholes

• Causes
• Excess moisture in subbase or subgrade

Flexible Pavement
47
Potholes

• Causes
• Excess moisture in subbase or subgrade
• Insufficient thickness

Flexible Pavement
48
Potholes

• Causes
• Excess moisture in subbase or subgrade
• Insufficient thickness
• Freeze/thaw

Flexible Pavement
49
Potholes

• Causes
• Excess moisture in subbase or subgrade
• Insufficient thickness
• Freeze/thaw
• Constant loading

Flexible Pavement
50
Potholes

• Cures
• Excavate and rebuild
• Including subgrade and subbase

Flexible Pavement
51
Bleeding (Flushing)
Flexible Pavement
52
Bleeding (Flushing)

• Causes
• High asphalt cement content

Flexible Pavement
53
Bleeding (Flushing)

• Causes
• High asphalt cement content
• Improper compaction

Flexible Pavement
54
Bleeding (Flushing)

• Causes
• High asphalt cement content
• Improper compaction
• High truck counts

Flexible Pavement
55
Bleeding (Flushing)

• Causes
• High asphalt cement content
• Improper compaction
• High truck counts
• Insufficient cooling

Flexible Pavement
56
Bleeding (Flushing)

• Cures
• Microsurfacing
• Mill and Overlay

Flexible Pavement