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Ray Myers

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Presentation by Ray Myers of the Asphalt Interlayer Association on interlayers and geosynthetics delivered at the CalAPA Fall Asphalt Pavement Conference held Oct. 24, 2013 in Sacramento, Calif.

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Ray Myers

  1. 1. Ray Myers Executive Director of the Asphalt Interlayer Association www.info@aia-us.org 916-933-9140 “Using Geosynthetics with Flexible Pavement Systems”
  2. 2. THERE ARE SO MANY OPPORTUNITIES FOR INFRASTRUCTURE IMPROVEMENTS, COST SAVINGS & INCREASED PROFITS USING GEOSYNTHETICS BELOW AND IN HMA/WMA
  3. 3. GEOSYNTHETICS BELOW Woven Geotextiles Nonwoven Geotextile Subgrade Geogrids IN Paving Fabrics Paving Mats Paving Grids Composite Paving Grids Composite Drainage Products
  4. 4. What’s new?  Caltrans Section reduction with Geosynthetics  2009 Subgrade Geotextiles  2012 Subgrade Geogrids  GRCS Geosynthetic Reinforced Chip Seal  UCDavis study on light reflection with GRCS  New products by Geosynthetic Manufacturers  NTPEP National Transportation Product Evaluation Program  Paving Fabric Bonding Agent [details from AIA]
  5. 5. Guide for Designing with Subgrade Enhancement Geotextiles Geotextiles[SEG’s] - 2009 Geogrids [ABEG’s] -2012 http://www.dot.ca.gov/hq/maint/Paveme nt/Offices/Pavement_Engineering/PDF/ Subgrade_Enhancement_Geosynthetic_ Design_and_Construction_Guide.pdf
  6. 6. Woven Geotextiles
  7. 7. Nonwoven Geotextiles
  8. 8. Geogrid for Base Reinforcement and Subgrade Stabilization
  9. 9. Most engineers/field personnel have used Geosynthetics (Grids and Geotextiles) to bridge unsuitable soils when they were encountered on the jobsite However, now we have the tools to proactively design for those conditions!
  10. 10. FHWA summary of factors that affect pavement life 1. 2. 3. 4. 5. 6. Water Traffic Load Subgrade Quality Maintenance Age Quality of Construction
  11. 11. Factors Affecting Pavement Life 1. Water creates 80% of the problems 2. Traffic Load 3. Subgrade Quality 4. Maintenance 5. Age 6. Quality of Construction
  12. 12. When water is present in the aggregate base traffic loading moves fines up & contaminates the aggregate base Fines lower the load bearing capacity of that aggregate base.
  13. 13. REED & GRAHAM INC.
  14. 14. Ways in which Water Enters the Road Through Permeable Surface Lateral Flow from Roadside Water Table Seepage from High Ground Capillary Flow
  15. 15. To mitigate the impacts of water on a pavement section: • Water (Side) Edge Drains • Water (Bottom) SEG’s • Water (Top) Interlayers
  16. 16. To mitigate the impacts of water on a pavement section: •Water (Side) Edge Drains • Water (Bottom) SEG’s • Water (Top) INTERLAYERS
  17. 17. Filtration: Typically Nonwoven
  18. 18. REED & GRAHAM INC.
  19. 19. To mitigate the impact of water on a pavement section coming from: • (Top, Side, Bottom) Edge Drains •(Bottom) use SEG’s Subgrade Enhancement Geotextiles • (Top) Interlayers
  20. 20. Separation Application
  21. 21. What happens Under the pavement ?
  22. 22. 1. Separation Now 2. Stabilization
  23. 23. Stabilization Application
  24. 24. Biaxial Geogrid Property Test Value Aperture size, incha min and max Calipered 0.8-1.3 x 1.0-1.6 Rib thickness, inch min Calipered 0.04 Junction thickness, inch min Calipered 0.150 Tensile strength, 2% strain, lb/fta min ASTM D 6637 410 x 620 Tensile strength at ultimate, lb/fta min ASTM D 6637 1,310 x 1,970 ASTM D 4355 100 Junction strength, lb/fta min ASTM D 7737 1,220 x 1,830 Overall flexural rigidity, mg-cm min ASTM D 7748 750,000 GRI:GG9 0.65 Ultraviolet resistance, percent min retained tensile strength, 500 hours Torsional rigidity at 20 cm-kg, mm-kg/degb min aMachine direction x cross direction Research Institute, Test Method GG9, Torsional Behavior of Bidirectional Geogrids When Subjected to In-Plane Rotation bGeosynthetic
  25. 25. Section Reduction with the use of a Geotextile and or a Geogrid produce alternate designs that can reduce Aggregate Base by as much as 30%! Cost Optimization
  26. 26. A B C D E F G H I J K L M Traffic Index 9.5 9.5 9.5 9.5 9.5 9.5 9.5 9.5 9.5 9.5 9.5 9.5 9.5 % Trucks 8% 8% 8% 8% 8% 8% 8% 8% 8% 8% 8% 8% 8% % Growth 4% 4% 4% 4% 4% 4% 4% 4% 4% 4% 4% 4% 4% R-value 10 10 10 10 10 10 10 10 10 10 10 10 10 Drain Coeff. 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 AC/AGG 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 A/C $/ton $75 $75 $75 $75 $75 $75 $75 $75 $75 $75 $75 $75 $75 BASE $/ton $40 $40 $40 $40 $40 $40 $40 $40 $40 $40 $40 $40 $40 $1.50 $1.50 $1.50 $1.50 $1.50 $1.50 $1.50 $1.50 $1.50 $1.50 $1.50 $1.50 $1.50 Required # 5.71 5.71 5.71 5.71 5.71 5.71 5.71 5.71 5.71 5.71 5.71 5.71 5.71 Design # 5.71 5.71 5.73 5.73 5.74 5.74 5.77 5.77 6.0 6.0 6.0 6.5 6.5 6.5 7.0 7.0 7.0 8.0 8.0 8.0 9.0 BASE (") 21.5 17.0 21.0 20.0 15.5 20.0 18.5 13.5 18.5 15.5 10.5 15.5 7.0 Sect.total 27.5 23.0 27.0 26.5 22.0 26.5 25.5 20.5 25.5 23.5 18.5 23.5 16.0 SEG/$SY ASPHALT (") SEG Y/N N HSW Cost/LnM$ $1.14M $1,006 Excav $k's $1.3M $1,122 20 HSW Design Life Cost Savings % Save k$/ln mile N HSW $1,121 $979 $1,314 $1,254 $1,090 20 35 20 12.7% -2.1% $164 ($28) HSW N HSW $1,092 $932 $1,281 $1,222 $1,037 20 35 20 2.5% 15.2% 0.3% $32 $196 $5 HSW N HSW 5.73 HSW HSW $799 $1,037 $878 $1,249 $1,157 $972 $1,18 4 $880k 20 35 20 20 35 20 5.0% 19.3% 2.9% 10.0% 24.4% 7.9% 31.6% $64 $249 $37 $129 $314 $102 $400k
  27. 27. CALTRANS HWY 53 CLEARLAKE, CA 01-3986A4 ~$150,000 to the contractor
  28. 28. We’ve covered Geosynthetics BELOW the pavement Now Geosynthetics IN the pavement
  29. 29. Caltrans MTAG http://www.dot.ca.gov/hq/maint/MTA_GuideVolume1Flexible.html Types of Interlayers Material Specifications Design Criteria Application Rates
  30. 30. DETERMINE TYPE AND LEVEL OF DISTRESS!!!!
  31. 31. Unacceptable pavement conditions to utilize interlayers         Rutting Internal Rutting due to unsatisfactory base Loose Asphalt Inadequate structure Standing water Excess traffic Quality of milling Lack of preparation
  32. 32.  Rutting or shoving AC
  33. 33. Unacceptable Grinding for most interlayers
  34. 34. Finish/Profile Grinding
  35. 35. Factors Affecting Pavement Life 1. Water creates 80% of the problems 2. Traffic Load 3. Subgrade Quality 4. Maintenance 5. Age 6. Quality of Construction
  36. 36. Why Use Interlayers? To provide an extension of pavement life by doing one or more of the following: 1. Reduce the pavement permeability by creating a moisture barrier 2. Reduce reflective cracking 3. Provide stress relief 4. Reinforcement
  37. 37. When to use Interlayers?  new construction,  rehabilitation or  preservation in conjunction with an overlay or surface treatment
  38. 38. Types of Interlayers  Fabric - Polypropylene  Mat - Polyester/Fiberglass  Grids  Non Composite  Composite  Peel & Stick Membranes
  39. 39. Paving Fabric  Paving Fabric: A non-woven geotextile fabric that is saturated with asphalt cement and placed with an overlay or chip seal.
  40. 40. Warm Mix with Paving Fabric
  41. 41. GRCS Geosynthetic Reinforced Chip Seals The specifications differ from that of fabric under an overlay Go to www.aia-us.org This process is used world wide Successful GRCS Projects that have been in place for 25 years and yet to require additional treatment.
  42. 42. GRCS: Terminal Blend Rubber Chip Seal over Paving Fabric
  43. 43. Paving Mat
  44. 44. Pavement Reinforcing Grid  Very high strength  50kN = 11240 pounds force  100kN = 22480 pounds force  200kN = 44960 pounds force That is why the term reinforcing is appropriate
  45. 45. Mill & Fill Failure
  46. 46. Pavement Reinforcing Composite Grid
  47. 47. MULTI-AXIAL COMPOSITE PAVING GRID
  48. 48. Recycling Paving Fabric
  49. 49. Can Asphalt with Paving fabric be Recycled? ABSOLUTELY!!!!! “Syracuse Revisited” Aia-us.org Consider Pavement Fabric Bonding Agent
  50. 50. To Recycle the system must be installed correctly
  51. 51. How much binder has been placed?
  52. 52. Post weigh test unit
  53. 53. Non Composite Paving Grid
  54. 54. Composite Membranes
  55. 55. NTPEP National Transportation Product Evaluation Program Developed in 2010/2011 in part through then leadership of an AIA member Allows states to get away from traditional APL/QPL’s Enables inspectors to be certain which product is being used
  56. 56. ·Product name ·Manufacturer ·Location manufactured ·AASHTO/NTPEP reference if applicable
  57. 57. THINK INSIDE THE GREEN BOX WITH HMA, WMA & GRCS TO BUILD PAVEMENTS THAT: A. LESS EXPENSIVE B. LAST LONGER C. USE LESS NATURAL RESOURCES D. GENERATE MORE PROFIT SO MANY BENEFITS OF THE ALLIANCE OF ASPHALT & GEOSYNTHETICS WHETHER BELOW OR IN THE PAVEMENT SECTION
  58. 58. Ray Myers Executive Director of the Asphalt Interlayer Association www.info@aia-us.org 916-933-9140 “Using Geosynthetics with Flexible Pavement Systems”

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