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Superpave Binder Purchase Specification

Superpave Binder Purchase Specification. Superpave Asphalt Binder Specification. The grading system is based on Climate. PG 64 - 22. Min pavement temperature. Performance Grade. Average 7-day max pavement temperature. P erformance G rades. CEC. Avg 7-day Max, o C.

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Superpave Binder Purchase Specification

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  1. Superpave Binder Purchase Specification

  2. Superpave Asphalt Binder Specification The grading system is based on Climate PG 64 - 22 Min pavement temperature Performance Grade Average 7-day max pavement temperature

  3. Performance Grades CEC Avg 7-day Max, oC PG 46 PG 52 PG 58 PG 64 PG 70 PG 76 PG 82 1-day Min, oC -34 -40 -46 -10 -16 -22 -28 -34 -40 -46 -16 -22 -28 -34 -40 -10 -16 -22 -28 -34 -40 -10 -16 -22 -28 -34 -40 -10 -16 -22 -28 -34 -10 -16 -22 -28 -34 ORIGINAL > 230 oC (Flash Point) FP <3Pa.s@135 oC (Rotational Viscosity) RV (Dynamic Shear Rheometer) DSR G*/sin  > 1.00 kPa 46 52 58 64 70 76 82 (ROLLING THIN FILM OVEN) RTFO Mass Loss < 1.00 % (Dynamic Shear Rheometer) DSR G*/sin  > 2.20 kPa 46 52 58 64 70 76 82 (PRESSURE AGING VESSEL) PAV 20 Hours, 2.07 MPa 90 90 100 100 100 (110) 100 (110) 110 (110) (Dynamic Shear Rheometer) DSR G* sin  < 5000 kPa 28 10 7 4 25 22 19 16 13 10 7 25 22 19 16 13 31 28 25 22 19 16 34 31 28 25 22 19 37 34 31 28 25 40 37 34 31 ( Bending Beam Rheometer) BBR “S” Stiffness & “m”- value S < 300 MPa m > 0.300 -24 -30 -36 0 -6 -12 -18 -24 -30 -36 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 0 -6 -12 -18 -24 Report Value (Bending Beam Rheometer) BBR Physical Hardening > 1.00 % (Direct Tension) DT -24 -30 -36 0 -6 -12 -18 -24 -30 -36 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 0 -6 -12 -18 -24

  4. How the PG Spec Works 58 64 CEC Spec Requirement Remains Constant Avg 7-day Max, oC PG 46 PG 52 PG 58 PG 64 PG 70 PG 76 PG 82 1-day Min, oC -34 -40 -46 -10 -16 -22 -28 -34 -40 -46 -16 -22 -28 -34 -40 -10 -16 -22 -28 -34 -40 -10 -16 -22 -28 -34 -40 -10 -16 -22 -28 -34 -10 -16 -22 -28 -34 ORIGINAL > 230 oC (Flash Point) FP <3Pa.s@135 oC (Rotational Viscosity) RV (Dynamic Shear Rheometer) DSR G*/sin  > 1.00 kPa 46 52 58 64 70 76 82 (ROLLING THIN FILM OVEN) RTFO Mass Loss < 1.00 % (Dynamic Shear Rheometer) DSR G*/sin  > 2.20 kPa 46 52 58 64 70 76 82 (PRESSURE AGING VESSEL) PAV 20 Hours, 2.07 MPa 90 90 100 100 100 (110) 100 (110) 110 (110) Test Temperature Changes (Dynamic Shear Rheometer) DSR G* sin  < 5000 kPa 28 10 7 4 25 22 19 16 13 10 7 25 22 19 16 13 31 28 25 22 19 16 34 31 28 25 22 19 37 34 31 28 25 40 37 34 31 ( Bending Beam Rheometer) BBR “S” Stiffness & “m”- value S < 300 MPa m > 0.300 -24 -30 -36 0 -6 -12 -18 -24 -30 -36 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 0 -6 -12 -18 -24 Report Value (Bending Beam Rheometer) BBR Physical Hardening > 1.00 % (Direct Tension) DT -24 -30 -36 0 -6 -12 -18 -24 -30 -36 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 0 -6 -12 -18 -24

  5. Permanent Deformation CEC Avg 7-day Max, oC PG 46 PG 52 PG 58 PG 64 PG 70 PG 76 PG 82 1-day Min, oC -34 -40 -46 -10 -16 -22 -28 -34 -40 -46 -16 -22 -28 -34 -40 -10 -16 -22 -28 -34 -40 -10 -16 -22 -28 -34 -40 -10 -16 -22 -28 -34 -10 -16 -22 -28 -34 ORIGINAL > 230 oC (Flash Point) FP <3Pa.s@135 oC (Rotational Viscosity) RV (Dynamic Shear Rheometer) DSR G*/sin  > 1.00 kPa 46 52 58 64 70 76 82 (ROLLING THIN FILM OVEN) RTFO Mass Loss < 1.00 % • Unaged • RTFO Aged (Dynamic Shear Rheometer) DSR G*/sin  > 2.20 kPa 46 52 58 64 70 76 82 (PRESSURE AGING VESSEL) PAV 20 Hours, 2.07 MPa 90 90 100 100 100 (110) 100 (110) 110 (110) (Dynamic Shear Rheometer) DSR G* sin  < 5000 kPa 28 10 7 4 25 22 19 16 13 10 7 25 22 19 16 13 31 28 25 22 19 16 34 31 28 25 22 19 37 34 31 28 25 40 37 34 31 ( Bending Beam Rheometer) BBR “S” Stiffness & “m”- value S < 300 MPa m > 0.300 -24 -30 -36 0 -6 -12 -18 -24 -30 -36 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 0 -6 -12 -18 -24 Report Value (Bending Beam Rheometer) BBR Physical Hardening > 1.00 % (Direct Tension) DT -24 -30 -36 0 -6 -12 -18 -24 -30 -36 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 0 -6 -12 -18 -24

  6. Permanent Deformation • Addressed by high temp stiffness • G*/sin  on unaged binder > 1.00 kPa • G*/sin  on RTFO aged binder > 2.20 kPa > Early part of pavement service life Heavy Trucks

  7. Fatigue Cracking CEC Avg 7-day Max, oC PG 46 PG 52 PG 58 PG 64 PG 70 PG 76 PG 82 1-day Min, oC -34 -40 -46 -10 -16 -22 -28 -34 -40 -46 -16 -22 -28 -34 -40 -10 -16 -22 -28 -34 -40 -10 -16 -22 -28 -34 -40 -10 -16 -22 -28 -34 -10 -16 -22 -28 -34 ORIGINAL > 230 oC (Flash Point) FP <3Pa.s@135 oC (Rotational Viscosity) RV (Dynamic Shear Rheometer) DSR G*/sin  > 1.00 kPa 46 52 58 64 70 76 82 (ROLLING THIN FILM OVEN) RTFO Mass Loss < 1.00 % (Dynamic Shear Rheometer) DSR G*/sin  > 2.20 kPa 46 52 58 64 70 76 82 (PRESSURE AGING VESSEL) PAV 20 Hours, 2.07 MPa 90 90 100 100 100 (110) 100 (110) 110 (110) (Dynamic Shear Rheometer) DSR G* sin  < 5000 kPa 28 10 7 4 25 22 19 16 13 10 7 25 22 19 16 13 31 28 25 22 19 16 34 31 28 25 22 19 37 34 31 28 25 40 37 34 31 PAV Aged ( Bending Beam Rheometer) BBR “S” Stiffness & “m”- value S < 300 MPa m > 0.300 -24 -30 -36 0 -6 -12 -18 -24 -30 -36 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 0 -6 -12 -18 -24 Report Value (Bending Beam Rheometer) BBR Physical Hardening > 1.00 % (Direct Tension) DT -24 -30 -36 0 -6 -12 -18 -24 -30 -36 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 0 -6 -12 -18 -24

  8. Fatigue Cracking • Addressed by intermediate temperature stiffness • G*sin  on RTFO & PAV aged binder < 5000 kPa > Later part of pavement service life

  9. Low Temperature Cracking CEC Avg 7-day Max, oC PG 46 PG 52 PG 58 PG 64 PG 70 PG 76 PG 82 1-day Min, oC -34 -40 -46 -10 -16 -22 -28 -34 -40 -46 -16 -22 -28 -34 -40 -10 -16 -22 -28 -34 -40 -10 -16 -22 -28 -34 -40 -10 -16 -22 -28 -34 -10 -16 -22 -28 -34 ORIGINAL > 230 oC (Flash Point) FP <3Pa.s@135 oC (Rotational Viscosity) RV (Dynamic Shear Rheometer) DSR G*/sin  > 1.00 kPa 46 52 58 64 70 76 82 (ROLLING THIN FILM OVEN) RTFO Mass Loss < 1.00 % (Dynamic Shear Rheometer) DSR G*/sin  > 2.20 kPa 46 52 58 64 70 76 82 (PRESSURE AGING VESSEL) PAV 20 Hours, 2.07 MPa 90 90 100 100 100 (110) 100 (110) 110 (110) (Dynamic Shear Rheometer) DSR G* sin  < 5000 kPa 28 10 7 4 25 22 19 16 13 10 7 25 22 19 16 13 31 28 25 22 19 16 34 31 28 25 22 19 37 34 31 28 25 40 37 34 31 ( Bending Beam Rheometer) BBR “S” Stiffness & “m”- value S < 300 MPa m > 0.300 PAV Aged -24 -30 -36 0 -6 -12 -18 -24 -30 -36 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 0 -6 -12 -18 -24 Report Value (Bending Beam Rheometer) BBR Physical Hardening > 1.00 % (Direct Tension) DT -24 -30 -36 0 -6 -12 -18 -24 -30 -36 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 0 -6 -12 -18 -24

  10. Low Temperature Cracking CEC Avg 7-day Max, oC PG 46 PG 52 PG 58 PG 64 PG 70 PG 76 PG 82 1-day Min, oC -34 -40 -46 -10 -16 -22 -28 -34 -40 -46 -16 -22 -28 -34 -40 -10 -16 -22 -28 -34 -40 -10 -16 -22 -28 -34 -40 -10 -16 -22 -28 -34 -10 -16 -22 -28 -34 ORIGINAL > 230 oC (Flash Point) FP <3Pa.s@135 oC (Rotational Viscosity) RV (Dynamic Shear Rheometer) DSR G*/sin  > 1.00 kPa 46 52 58 64 70 76 82 (ROLLING THIN FILM OVEN) RTFO Mass Loss < 1.00 % (Dynamic Shear Rheometer) DSR G*/sin  > 2.20 kPa 46 52 58 64 70 76 82 (PRESSURE AGING VESSEL) PAV 20 Hours, 2.07 MPa 90 90 100 100 100 (110) 100 (110) 110 (110) (Dynamic Shear Rheometer) DSR G* sin  < 5000 kPa 28 10 7 4 25 22 19 16 13 10 7 25 22 19 16 13 31 28 25 22 19 16 34 31 28 25 22 19 37 34 31 28 25 40 37 34 31 ( Bending Beam Rheometer) BBR “S” Stiffness & “m”- value S < 300 MPa m > 0.300 PAV Aged -24 -30 -36 0 -6 -12 -18 -24 -30 -36 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 0 -6 -12 -18 -24 Report Value (Bending Beam Rheometer) BBR Physical Hardening > 1.00 % (Direct Tension) DT -24 -30 -36 0 -6 -12 -18 -24 -30 -36 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 0 -6 -12 -18 -24

  11. Miscellaneous Spec Requirements CEC Avg 7-day Max, oC PG 46 PG 52 PG 58 PG 64 PG 70 PG 76 PG 82 1-day Min, oC -34 -40 -46 -10 -16 -22 -28 -34 -40 -46 -16 -22 -28 -34 -40 -10 -16 -22 -28 -34 -40 -10 -16 -22 -28 -34 -40 -10 -16 -22 -28 -34 -10 -16 -22 -28 -34 ORIGINAL > 230 oC FlashPoint (Flash Point) FP <3Pa.s@135 oC (Rotational Viscosity) RV (Dynamic Shear Rheometer) DSR G*/sin  > 1.00 kPa 46 52 58 64 70 76 82 MassLoss (ROLLING THIN FILM OVEN) RTFO Mass Loss < 1.00 % (Dynamic Shear Rheometer) DSR G*/sin  > 2.20 kPa 46 52 58 64 70 76 82 (PRESSURE AGING VESSEL) PAV 20 Hours, 2.07 MPa 90 90 100 100 100 (110) 100 (110) 110 (110) (Dynamic Shear Rheometer) DSR G* sin  < 5000 kPa 28 10 7 4 25 22 19 16 13 10 7 25 22 19 16 13 31 28 25 22 19 16 34 31 28 25 22 19 37 34 31 28 25 40 37 34 31 ( Bending Beam Rheometer) BBR “S” Stiffness & “m”- value S < 300 MPa m > 0.300 -24 -30 -36 0 -6 -12 -18 -24 -30 -36 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 0 -6 -12 -18 -24 Report Value (Bending Beam Rheometer) BBR Physical Hardening > 1.00 % (Direct Tension) DT -24 -30 -36 0 -6 -12 -18 -24 -30 -36 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 0 -6 -12 -18 -24

  12. PG Binder Selection > Many agencies have established zones PG 52-28 PG 58-22 PG 58-16 PG 64-10

  13. SHRP A-648A Developed from Air Temperatures > 20 years • Superpave Weather Database • 6500 stations in U.S. and Canada • Annual air temperatures • hottest seven-day temp (avg and std dev) • coldest temp (avg and std dev) • Calculated pavement temps used in PG selection

  14. Reliability • Percent Probability of Not Exceeding Design Temp > using Normal Distribution Reliability is area under curve to the left of Tdes frequency of observed temps (Total area under curve = 100 %) Tavg Tdes

  15. Observed Air Temperatures Topeka, KS 50 % reliability average summer very hot summer 98 % reliability > this data - standard deviation of 2°C 36 40 7-Day Maximum Air Temperatures

  16. -40 -30 -20 -10 0 10 20 30 40 50 60 Observed Air TemperaturesTopeka, KS 36 very cold winter 40 average winter -31 -23 > standard deviation of 4°C

  17. Pavt Temp = f ( Air Temp, Depth, Latitude ) Convert to Pavement Temperature • Calculated by Superpave software • High Temperature • 20 mm below surface of mixture • Low Temperature • at surface of mixture

  18. 56 60 -31 -23 -40 -30 -20 -10 0 10 20 30 40 50 60 70 Calculated Pavement TemperaturesTopeka, KS pvt > air pvt = air

  19. PG Binder GradesTopeka, KS PG 64-34 (98% minimum reliability) PG 58-28 (50 % minimum reliability) PG grades - six degree increments -40 -30 -20 -10 0 10 20 30 40 50 60 70

  20. Effect of Rounding to Standard Grades PG 58-28 (50 % minimum reliability) • PG 58 provides 85% reliability • PG -28 provides 90% reliability -40 -30 -20 -10 0 10 20 30 40 50 60 70

  21. -16 -22 -28 Effect of Rounding to Standard Grades needed grade for 50% reliability selected grade for 50% reliability Rounding depends on actual temps! -28 -23 Minimum Pavement Temperatures

  22. Effect of Loading Rate on Binder Selection 90 kph • Dilemma • specified DSR loading rate is 10 rad/sec • what about longer loading times ? • Use binder with more stiffness at higher temps • slow - - increase one high temp grade • stationary - - increase two high temp grades • no effect on low temp grade

  23. Effect of Loading Rate on Binder Selection • Example • for toll road PG 64-22 • for toll booth PG 70-22 • for weigh stations PG 76-22 90 kph Slow Stopping

  24. 80 kN ESALs Effect of Traffic Amounton Binder Selection • 10 - 30 x 106 ESAL • Consider increasing - - one high temp grade • 30 x 106 + ESAL • Recommend increasing - - one high temp grade > Equivalent Single Axle Loads

  25. 80 kN 18,000 lb. 100 kN 22,000 lb. 44 kN 10,000 lb. 2.2 ESAL .09 ESAL 1 ESAL ESAL Comparison

  26. Little Truck 67 kN 15,000 lb 0.48 ESAL 27 kN 6,000 lb 0.01 ESAL 0.49 ESALs = + BIG TRUCK 151 kN 34,000 lb 1.10 151 kN 34,000 lb 1.10 54 kN 12,000 lb 0.19 2.39 ESALs = + +

  27. How the PG Spec Works 58 64 CEC Spec Requirement Remains Constant Avg 7-day Max, oC PG 46 PG 52 PG 58 PG 64 PG 70 PG 76 PG 82 1-day Min, oC -34 -40 -46 -10 -16 -22 -28 -34 -40 -46 -16 -22 -28 -34 -40 -10 -16 -22 -28 -34 -40 -10 -16 -22 -28 -34 -40 -10 -16 -22 -28 -34 -10 -16 -22 -28 -34 ORIGINAL > 230 oC (Flash Point) FP <3Pa.s@135 oC (Rotational Viscosity) RV (Dynamic Shear Rheometer) DSR G*/sin  > 1.00 kPa 46 52 58 64 70 76 82 (ROLLING THIN FILM OVEN) RTFO Mass Loss < 1.00 % (Dynamic Shear Rheometer) DSR G*/sin  > 2.20 kPa 46 52 58 64 70 76 82 (PRESSURE AGING VESSEL) PAV 20 Hours, 2.07 MPa 90 90 100 100 100 (110) 100 (110) 110 (110) Test Temperature Changes (Dynamic Shear Rheometer) DSR G* sin  < 5000 kPa 28 10 7 4 25 22 19 16 13 10 7 25 22 19 16 13 31 28 25 22 19 16 34 31 28 25 22 19 37 34 31 28 25 40 37 34 31 ( Bending Beam Rheometer) BBR “S” Stiffness & “m”- value S < 300 MPa m > 0.300 -24 -30 -36 0 -6 -12 -18 -24 -30 -36 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 0 -6 -12 -18 -24 Report Value (Bending Beam Rheometer) BBR Physical Hardening > 1.00 % (Direct Tension) DT -24 -30 -36 0 -6 -12 -18 -24 -30 -36 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 -30 0 -6 -12 -18 -24 0 -6 -12 -18 -24

  28. Summary of How to Use PG Specification • Determine • 7-day max pavement temperatures • 1-day minimum pavement temperature • Use specification tables to select test temperatures • Determine asphalt cement properties and compare to specification limits

  29. Questions - ?

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