1 / 38

Comal County Chip Sealing

Comal County Chip Sealing. June 26, 2007. 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. Advantages of Chip Sealing.

aquila
Download Presentation

Comal County Chip Sealing

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Comal County Chip Sealing June 26, 2007

  2. 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

  3. 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

  4. 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

  5. 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

  6. Construction Process Surface Preparation • Crack Sealing or Filling of Cracks • Patching Deteriorated Areas • Cleaning or Brooming Any Loose Material • Removing Pavement Markers and Delineators

  7. 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

  8. 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

  9. 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

  10. Construction Process Rolling • 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

  11. Construction Process Brooming • After Chip Seal, Excess Aggregate Must be Broomed Off • Within 2 to 4 Hours after Sealing

  12. 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.

  13. Comal County Canyon Lake Spillway Canyon June 26, 2007

  14. Storm Total for 1998 1998 Storm Totals

  15. Storm Total for 2002

  16. Structural Flood Control Measures in Comal County Canyon Reservoir

  17. Structural Flood Control Measures in Comal County Emergency Spillway

  18. Structural Flood Control Measures in Comal County x

More Related