Effective Use of Tack Coats
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This document discusses tack coats, which are used to bond new asphalt layers to existing pavement. It defines tack coats and their components, like residual asphalt. It reviews tack coat application methods like emulsions and hot-applied asphalt. Proper application involves spraying the tack coat at a rate of 0.06 to 0.1 gallons per square yard to ensure full coverage. Issues with application like clogged nozzles, uneven coverage, or too little residual asphalt can cause pavement failures over time, like slippage, cracking and potholes. Maintaining a clean surface and proper application technique are emphasized for durable pavement bonding.
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Effective Use of Tack Coats
- 1. TACK COATS Tom Hicks Ergon Asphalt & Emulsions 14929 Slover Ave. Fontana, CA 92337 909-265-5673 AN ERGON ASPHALT & EMULSIONS PRESENTATION
- 2. we ARE WHO
- 3. OPERATING UNITS of ERGON • ASPHALT & EMULSIONS • REFINING • REAL ESTATE • TRANSPORTATION & TERMINALING • OIL & GAS • COMMERCIAL CONSTRUCTION
- 5. A G E N D A
- 6. My 1st Hot Mix Working on Compaction My 1st Slurry Mix Additional Biographical Information
- 7. TACK COAT ASTMDefinesatackas…“an application of bituminous material to an existing relatively non absorptive surface to provide a thorough bond between old and new surfacing”
- 8. • Residual Asphalt - the remaining asphalt after an emulsion has set typically 57-70 percent. • Tack Coat Break - the moment when water separates enough from the asphalt showing a color change from brown to black. • Tack Coat Set - when all the water has evaporated, leaving only the residual asphalt. Some refer to this as completely broke. • Diluted Emulsion - an emulsion that had been diluted with additional water. 50:50, 60:40 TERMINOLOGY
- 9. No IS THIS A TACK COAT? Yes! IS THIS A TACKY COAT?
- 10. PURPOSE Bond two layers of pavement together… Tack Coat Pavement or two all beef patties
- 12. Emulsified Asphalt Most common option SS-1, SS-1H CSS-1, CSS-1H PG Graded Binders Neat Binders PG 58-28 PG 64-22 PG 67-22 Polymer Modified Reduced or Non-tracking Emulsion COMMON TACK COAT MATERIALS
- 13. Advantages Disadvantages EMULSIONS •Cost effective •Can handle wet or damp surfaces •Effective on milled pavements •Safety advantage •Break time •Tracking SS-1H/CSS-1H
- 14. Advantages Disadvantages HOT APPLIED •Night time work •Quick release to paving operations. •Less tracking/no tracking •Issues with dirty surfaces •Needs a dry surface to bond to •Higher costs PG 64-10, PG 70-10, NO TRACK HOT APPLIED
- 15. SPRAY BAR SET UP Triple Lap Coverage 12” Existing Asphalt Pavement SprayBar
- 16. 30o Spray Bar - Bottom View NOZZLE ALIGNMENT
- 17. PROPER TACK COAT APPLICATION What does it look like?
- 18. .06 Shot Rate PROPER TACK COAT APPLICATION
- 19. .06 Shot Rate PROPER TACK COAT APPLICATION
- 20. .08 Shot Rate .1 Shot Rate PROPER TACK COAT APPLICATION
- 21. .10 Shot Rate PROPER TACK COAT APPLICATION
- 22. 0.1 gal/yd2 shot rate PROPER TACK COAT APPLICATION
- 23. Original Pavement New Asphalt Tack Coat Original Pavement New Asphalt New asphalt layer not uniformly acting as one with the original pavement New asphalt layer uniformly acting as one with the original pavement Corn Row, Clogged Tips, Drilling Flexing can cause slippage, delaminating, premature cracking ANATOMY OF A POOR TACK COAT APPLICATION
- 24. TROUBLE SHOOTING
- 25. TROUBLE SHOOTING Existing Asphalt Pavement SprayBar Partially Clogged Tip Completely Clogged Tip CAUSES Clogged Tips
- 26. Clogged TipsTROUBLE SHOOTING Partially Clogged tips creating a drilling effect Completely Clogged tips
- 27. Spray Bar Asphalt Pavement • Low Bar Pressure • Low Application Rate • Wrong Nozzle Size • Spray Bar Too High Corn Rows CAUSES TROUBLE SHOOTING
- 29. TROUBLE SHOOTING Looks can be deceiving
- 30. Look in both directions to help determine if the tack is being applied properly View: Northwest View: Southeast TROUBLE SHOOTING Looks can be deceiving
- 32. ½” Deflection, 60# Load ¼” Deflection, 160# Load Fully BondedNon-bonded Courtesy of Bob Humer/Asphalt Institute
- 33. Bonding Failures Courtesy of Bob Humer/Asphalt Institute
- 34. Days later! Courtesy of Bob Humer/Asphalt Institute & Road Science Dramatic Example of Pavement Slippage
- 37. Premature Cracking & Pot Holes
- 38. Delaminating
- 39. Please buy more tack!!! Distressed emulsion salesman.
- 41. COST OF TACK COAT New or Reconstruction About 0.1-0.2% of Project Total About 1.0-1.5% of Pavement Total Cost Mill and Overlay About 1.0-2.0% of Project Total About 1.0-2.5% of Pavement Total Cost
- 43. SURFACE PREPARATION Surface needs to be clean and free of loose debris
- 45. RESIDUAL ASPHALT Specified Residual Asphalt of .050/yd2 If you want this Instead of this Consider … 50/50 dilution: your shot rate would be .166 gal/yd2 to maintain a residual of .050/yd2 60/40 dilution: your shot rate would be .139 gal/yd2 to maintain a residual of .050/yd2 70/30 dilution: your shot rate would be .119 gal/yd2 to maintain a residual of .050/yd2 For Emulsion: your shot rate would be .083gal/yd2 (Assuming a residual asphalt for emulsion of 60)
- 46. COMMON ISSUES
- 47. Like watching paint dryLike watching grass grow Takes too long to break!
- 48. Intermittent Targeted Fog Sealing OR TRACKING