Post on 24-Jan-2016
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Pavement Preservation and Maintenance
Private Roads Maintenance Workshop August 18, 2012
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
Pavement Preservation Techniques
Micro-Surfacing
Crack Seal Fog Seal
Thin HMA Overlay
Slurry Seal
Ultrathin Bonded Wearing Course
(for Flexible / Asphalt Pavements)
Crack Sealing
• Routine maintenance• Cleaning & sealing• Prevents intrusion of
water & incompressible materials
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
Surface Treatments
• Typically used to:• Seal cracks• Waterproof surface• Improve surface texture• Rejuvenate surface
Fog Seal
• Seal pavement• Inhibit raveling• Enrich hardened/
oxidized asphalt• Provide delineation
with shoulder
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
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
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
Micro-Surfacing
• Inhibit raveling & surface oxidation
• Improve surface texture• Fill ruts/minor surface
irregularities• Seal pavement surface
Micro-Surfacing
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
Ultrathin Bonded Wearing Course
• Porous• Firmly bond to existing surface• Seal pavement• Increase surface
macro-texture• Address surface distress• Reduce back-spray
improving visibility
Thin Overlay
• Improve smoothness and surface texture
• Address surface distress• Improve profile, crown,
and cross-slope
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
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)
Questions?
Larry PatrickExecutive DirectorOk. Asphalt Pavement Assoc.405-524-7675lpatrick@okhotmix.com