Pavement Preservation and Maintenance
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Transcript of Pavement Preservation and Maintenance
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Pavement Preservation and Maintenance
Private Roads Maintenance Workshop August 18, 2012
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Pavement Maintenance Types
• Preventive (Proactive)– Preserves good condition pavement
• Arrest light deterioration• Retard progressive failures• Reduce need for corrective maintenance
• Corrective (Reactive)– After deficiency occurs;
more expensive• Load carrying ability• Waterproofing (cracks)• Surface slope (rutting)• Surface roughness
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Pavement Preservation Techniques
Micro-Surfacing
Crack Seal Fog Seal
Thin HMA Overlay
Slurry Seal
Ultrathin Bonded Wearing Course
(for Flexible / Asphalt Pavements)
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Crack Sealing
• Routine maintenance• Cleaning & sealing• Prevents intrusion of
water & incompressible materials
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Effective
Marginal
Not Appropriate
No Impact
Distress TypeFatigue Cracking
Linear or Block Crack.Rutting
RavelingBleeding
RoughnessTexture Loss
Moisture Damage
Extent of ProblemLow severity
High severity
Crack Sealing
For identification of severity of distress: SHRP P338 Distress Manual
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Surface Treatments
• Typically used to:• Seal cracks• Waterproof surface• Improve surface texture• Rejuvenate surface
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Fog Seal
• Seal pavement• Inhibit raveling• Enrich hardened/
oxidized asphalt• Provide delineation
with shoulder
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Distress TypeExtent of Problem
Low severity
High severity
Fatigue CrackingLinear or Block Crack.
RuttingRavelingBleeding
RoughnessTexture Loss
Moisture Damage
Fog Seal
Effective
Marginal
Not Appropriate
No Impact
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Slurry Seal
• Type I (small aggregate)– Seal surface
cracks• Type II (medium
aggregate)– Correct raveling/
oxidation• Type III (larger aggregate)
– Fill minor surface irregularities and restore surface texture
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Distress TypeExtent of Problem
Low severity
High severity
Fatigue CrackingLinear or Block Crack.
RuttingRavelingBleeding
RoughnessTexture Loss
Moisture Damage
Slurry Seal
Effective
Marginal
Not Appropriate
No Impact
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Micro-Surfacing
• Inhibit raveling & surface oxidation
• Improve surface texture• Fill ruts/minor surface
irregularities• Seal pavement surface
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Micro-Surfacing
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Distress TypeExtent of Problem
Low severity
High severity
Fatigue CrackingLinear or Block Crack.
RuttingRavelingBleeding
RoughnessTexture Loss
Moisture Damage
Micro-Surfacing
Effective
Marginal
Not Appropriate
No Impact
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Ultrathin Bonded Wearing Course
• Porous• Firmly bond to existing surface• Seal pavement• Increase surface
macro-texture• Address surface distress• Reduce back-spray
improving visibility
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Thin Overlay
• Improve smoothness and surface texture
• Address surface distress• Improve profile, crown,
and cross-slope
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Thin Overlay
Distress TypeExtent of Problem
Low severity
High severity
Fatigue CrackingLinear or Block Crack.
RuttingRavelingBleeding
RoughnessTexture Loss
Moisture Damage
Effective
Marginal
Not Appropriate
No Impact
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Benefits of Pavement Preservation
The “right” treatment At the “right” time
On the “right” project–Extended life or serviceability–Lower life-cycle costs (cost
effectiveness)