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PAVEMENT MAINTENANCE 1

Idaho Roads Scholar Program. PAVEMENT MAINTENANCE 1. Part 3: Potholes and Cracks. Objectives. Explore alternatives for repairing potholes, Review options for extensive patching, Investigate methods and materials for treating pavement cracking. . HOW A POTHOLE DEVELOPS.

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PAVEMENT MAINTENANCE 1

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  1. Idaho Roads Scholar Program PAVEMENT MAINTENANCE 1 Part 3: Potholes and Cracks

  2. Objectives • Explore alternatives for repairing potholes, • Review options for extensive patching, • Investigate methods and materials for treating pavement cracking.

  3. HOW A POTHOLE DEVELOPS

  4. HOW A POTHOLEDEVELOPS

  5. Elements of Successful Pothole Patching • Use high-quality patching materials, which are cost-effective compared to less expensive products. • Place--do not throw--material in the patch area. • Compact every patch.

  6. High Quality Cold Mixes Include: • Carefully selected aggregate types and gradations • Very clean, durable aggregates • Very little sand-mixtures are porous • Polymer modified binder • Additives that promote adhesion in wet conditions

  7. Asphalt Cold Patch Materials • Standard Spec 00745.00 Asphalt Cold Patch-High Performance • Qualified Products List available describing suitable materials

  8. “There’s a gentleman here to see you about potholes.”

  9. Permanent Repairs

  10. Dig Out and Repair • Identify area affected • Remove to sound material • Clean, tack edges • Place patching mixture • Compact • Check level

  11. Mark Area to be Patched Mark patch area, extending at least 1 foot outside of distressed area.

  12. Remove Failed Materials

  13. Place Patching Mixture

  14. Spread Mixture Carefully

  15. Compact Each Lift Thoroughly

  16. Straight-edge the Patch

  17. Blown-in Pothole Filler

  18. Blown-In Filler The hole is cleaned with a high volume blower. A tack coat of asphalt is applied to the area. A mixture of aggregate and hot asphalt fills the hole. A finish coat of aggregate, and traffic flows. SPRAY INJECTION

  19. Patching Rules of Thumb • Dig out 1 foot beyond the visible cracking • Don’t rock the jackhammer • Dig out at least 1 1/2 times the thickness of the failed AC • Compaction, compaction, compaction.

  20. Questions? Potholes and Cracks

  21. Crack TreatmentsPurpose • Used to prevent water and debris from entering individual cracks in the asphalt pavement surface • Crack treatments are both a corrective and preventative maintenance treatment.

  22. Crack Sealing Feasibility Extent of Problem Distress Type Major Minor Fatigue Cracking Linear & Block Cracking “Stable” Rutting Raveling Flushing/Bleeding Roughness Friction Loss Moisture Damage Shoving Feasible Not Appropriate

  23. Effectiveness Effective Marginal No Impact Crack Sealing Extent of Problem Distress Type Major Minor Fatigue Cracking Linear & Block Crack “Stable” Rutting Raveling Flushing/Bleeding Roughness Friction Loss Moisture Damage Shoving

  24. Crack Width Treatment Options < 1/8 inch (3 mm), non-working • Do nothing • Fog seal • Surface treatment (chip seal, slurry, etc.) 1/8 – 3/4 inch (3 – 19 mm) • Crack Fill (short life, prep for resurfacing) • Crack Seal (> 5 yr life) > 3 /4 inch (19 mm) • Filling (sand or sand-emulsion slurry) • Patching (cut and replace material) Crack Repair Guidelines

  25. Don’t do this!

  26. Or this!

  27. Proper Crack Sealing Technique

  28. For Effective Crack Sealing: • Perform sealing during late fall/early spring when cracks are open. • Sealing does not proceed if rain is imminent. • Ambient or surface temperature should meet manufacturer’s requirements—usually 40F and rising for routing and sealing. • Use appropriate materials.

  29. Preparation is Key! • Spray the weeds in advance • Clean the pavement surface. • Provide for traffic control. • Clean the crack, removing any moss or grass out of crack. • Dry the crack if necessary. (Hot air lance) • Fill it with crack seal material. • Apply something to surface of seal to minimize the tackiness.

  30. Pavement Preparation • Cleaning and Drying • Broom • Compressed Air • Sandblasting • Hot Air Blasting (Heat Lance)

  31. Cracks Must Be Clean & Dry Use Compressed Air Note: Be Sure Compressor Is Equipped With A Moisture Trap

  32. Up to 3000°F > 2000 ft/sec blast velocity Propane burner-no flame Conducted immediately ahead of sealant installation (5 mins or 50 yards max) Comments: For wet conditions, lance can improve performance Otherwise, compressed air may be more effective (Québec study) ...Or Clean with a Hot Air Lance

  33. Rout and Seal • Cut the pavement to a prescribed width and depth • Improves sealant performance • Better adhesion • Reduced tensile stress on material Crafco, Inc

  34. Crack Sealing W D Typical Dimensions: W = 0.5” to 0.75” D = 0.5” to 0.75”

  35. Traffic Control • Detour traffic until seal cures • Cover sealant with sand for quick opening • Begin filling at pavement centerline

  36. Blotting Materials • Dry sand • Toilet paper (proven effective in SHRP research!)

  37. Crack Seal Materials • Standard Spec 00746.00 Poured Filler/ Hot Poured • Qualified Products List available describing suitable materials

  38. Crack Seal • The most common product used: D1190 • Cost per pound: $0.26 • Cost per linear foot to crack seal: $0.40 • Should reseal after 5 years?

  39. Crack Sealing

  40. Crack Sealing Rules of Thumb • For linear cracks only (not intended form alligator cracking) • Clean cracks with forced air or heat lance • Don’t over-fill crack with sealant; avoid surface smears • Sweep up excess sanding

  41. Review • Investigate methods and materials for treating pavement cracking, • Explore alternatives for repairing potholes, • Review options for extensive patching.

  42. Questions? Potholes and Cracks

  43. Small Group Activity • Identify the distress • Describe the cause • Outline the optimum maintenance repair 10 Minutes

  44. Photo No. 1:

  45. Photo No. 2:

  46. Photo No. 3:

  47. Photo No. 4: AI 38: Use for Group

  48. Photo No. 5: AI 30: Use for Group

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