Comal County Chip Sealing June 26, 2007.
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Transcript of Comal County Chip Sealing June 26, 2007.
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Comal County Chip Sealing
June 26, 2007
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Chip sealing is the application of a bituminous binder immediately followed by the application of an aggregate. The aggregate is then rolled to embed it into the binder.
Binder Application
Aggregate Application
Rolled
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Advantages of Chip Sealing
• Improved Skid Resistance
• Cost Effective Treatments
• Good Durability (Typically 5-7 Years)
• Ease of Construction
• Chip Seal = 1 Mile/Day
• Asphalt = 1 Mile/Week
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Disadvantages of Chip Sealing
• Flying Chips – Broken windshields and vehicle damage
• Noise Considerations – Chip seals can be noisy to travel on
• Weather Considerations – Must be constructed during warm, dry weather during daytime only
• Pedestrian – Not good for roller-blading & skateboarding
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Materials
Binders must provide good adhesion,
or stickiness
Aggregates must have following characteristics:• Single-sized, if possible• Clean• Angular (not rounded)• Aggregates must be damp for emulsion use
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Construction Process
Surface Preparation
• Crack Sealing or Filling of Cracks
• Patching Deteriorated Areas
• Cleaning or Brooming Any Loose Material
• Removing Pavement Markers and Delineators
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Construction Process
Binder Application
• Uniformly Apply the Binder Over the Surface at a Designed Rate
• Pavement Surface Temperature Should be 55ºF and Rising
• Humidity Should be 50% or Lower
• Most Important Step in Process
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Construction Process
Aggregate Application
• Should Follow the Binder Application by no more than 90 Seconds
• Should be no more than 100 Feet Behind Distributor Truck
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Construction Process
Aggregate Application
• Should Follow the Binder Application by no more than 90 Seconds
• Should be no more than 100 Feet Behind Distributor Truck
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Construction ProcessRolling
• Initial Rolling by Pneumatic Roller or Steel Rollers
• Compaction by Traffic Finishes the Process
• Should be Done During Hotter Weather
• Should Follow Aggregate Spreading by no more than 500 Feet
• Minimum of Two Rollers Should be Used to Cover the Full Width of the Chip Spreader
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Construction ProcessBrooming
• After Chip Seal, Excess Aggregate Must be Broomed Off
• Within 2 to 4 Hours after Sealing
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Possible Problems
• Bleeding – Too much binder leading to “leaking” of emulsion
• Traffic Control – Ensure that vehicles do not drive on binder application
• “Shelling” – Aggregate not applied in a timely manner. Binder sets. Aggregate does not stay in place.
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Comal County Canyon Lake
Spillway Canyon
June 26, 2007
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1998 Storm Totals
Storm Total for 1998
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Storm Total for 2002
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Structural Flood Control Measures in Comal County
Canyon Reservoir
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Structural Flood Control Measures in Comal County
Emergency Spillway
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Structural Flood Control Measures in Comal County
x
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