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CRACK SEAL SUBTASK GROUP

CRACK SEAL SUBTASK GROUP. Kelly McClain – CalTrans Co-chair Jim Chehovits – Crafco, Industry Co- Chair Wally Smith – Deery Corporation Steve Escobar - Apart. Review MTAG Crack Seal Chapter Crack Sealing vs Crack Filling LTPP Bind Pavement Temperatures Current CalTrans Sealing Specs

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CRACK SEAL SUBTASK GROUP

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  1. CRACK SEAL SUBTASK GROUP Kelly McClain – CalTrans Co-chair Jim Chehovits – Crafco, Industry Co- Chair Wally Smith – Deery Corporation Steve Escobar - Apart

  2. Review MTAG Crack Seal Chapter • Crack Sealing vs Crack Filling • LTPP Bind Pavement Temperatures • Current CalTrans Sealing Specs • Proposed Spec Changes/Improvements

  3. MTAG Chapter 3 – Crack Sealing • Crack Types - Crack Preparation • Crack Treatment Criteria - Installation • Crack Sealing - Construction • Crack Filling - Finishing • Materials - Troubleshooting

  4. Sealing vs Filling Sealing - Working Cracks (> 1/8″ movement) - Thermal Transverse > 20‘ spacing Filling - Non-Working Cracks (< 1/8″ movement) - Longitudinal, Block, Close Transverse

  5. Sealing vs Filling Sealing – Install flexible, extensible sealant into widened reservoirs Filling – Install stiffer traffic resistant products into cleaned, prepared cracks

  6. Pavement Temperatures FHWA LTPP Bind determines high and low pavement temperatures

  7. California PavementTemperatures (98%) 76 – 10 Death Valley 70 – 10 Indio, Barstow, San Bernardino 64 – 10 LA, Sacramento 64 – 16 Bishop, Yosemite, Lancaster 64 – 22 Susanville, Mt. Shasta

  8. California PavementTemperatures (98%) 58 – 10 San Francisco, Oakland 58 – 16 Mono Lake 58 – 22 Lodgepole 58 – 28 Tahoe 52 – 10 Eureka, Half Moon Bay

  9. FHWA Application Note – Using LTPP Bind V2.1 To Improve Crack Sealing in Asphalt Concrete Pavements. Dec 2003 Sealant/Filler properties should be chosen to function over the temperature range experienced.

  10. CalTrans SSP-37-400 • Emulsion Crack Sealant • Polyester Fiber Asphalt • Modified Asphalt Crack Sealant • Low Modulus Asphalt Crack Sealant • Preparation • Application • Measurement and Payment

  11. Proposed Materials Specification Changes Emulsified – Review & Update if Needed Fiber Asphalt – Eliminate Modified Asphalt – 3 Temperature Grades Low Modulus – 2 Temperature Grades (rename)

  12. Proposed Modified Asphalt Sealant Specification TestColdModerateHot Softening Point 82°C min 90°C min 98°C min Cone Penetration 50-70 35-55 20-40 Resilience 40% min 40% min 40% min Viscosity , 204C 20-100 poise 20-100 poise 20-100 poise Flexibility -16°C -10°C -4°C Asphalt Compatibility pass pass pass Tensile Adhesion 500% min 500% min 400% min

  13. Polymer Asphalt Crack Sealant TestColdHot Softening Point 82°C min 98°C min Cone Penetration 50-90 20-40 Resilience 30-60% 30-60% Viscosity , 204C 40 poise max 40 poise max Flexibility -28°C -16°C

  14. Treatment Selection • Pavement condition evaluation – seal or fill • Temperature extremes to select material type

  15. Installation Methods - Sealing • Reservoir Cutting • Cleaning • Application • Finishing • Measurement and Payment

  16. Installation Methods - Filling • Crack Cleaning • Application • Finishing • Measurement and Payment

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