Chris Abadie, P.E. DOTD Materials Engineer Administrator. OHMPA Ontario Hot Mix Paving Association

Transcription

1 Louisiana Asphalt Materials Performing for the past 20 years. Chris Abadie, P.E. DOTD Materials Engineer Administrator OHMPA Ontario Hot Mix Paving Association Toronto December 2 nd 2015

2 Performance and Performance Specifications 1) History 2) Asphalt Binder Modified Asphalts 3) Asphalt Mixture Superpave SMA OGFC

3 Benefits of Polymer Modification 1991 LTRC Presentation (Dr. Louay Mohammad) Polymer-modified asphalt properties improved Fatigue cracking resistance Permanent deformation resistance Thermally induced cracking resistance Less moisture sensitivity Reduced age hardening Improvements unique to polymer asphalt combination

4 Flow time 54C % % Value of Polymer Asphalt Lab Mix Analysis PG 64 $400 / $75 PG 70m $500 / $80 PG 76m $600 / $85 Binder Cost ($400/T ) $ % +50% HMA Cost ($75/T ) $ %,$80 +13%, $85 DSCE, 10C 1 250% 400% SCB, 25 C 4.5Jc 10% 50% Dyn Mod (E*) AMPT -10 C 1 10% 10% 25 C 1 15% 15% 54 C 1 15% 50% Flow no. 54 C 1 100% 1000%

5 G*/sin(delta) vs. ALF Rutting

6 MSCR (Jnr) vs. ALF Rutting

7 Louisiana MSCR Specification Table Property Tests on Original Binder: AASHTO Test Method PG82-22rm 1 PG76-22m PG70-22m PG (PG64-22 ) PG58-28 Spec. Spec. Spec. Spec. Spec. Rotational T C, Pa s 2 Dynamic Shear, 10 rad/s, G*/Sin Delta, kpa T C 76 C 70 C 67 C 58 C Dynamic Shear, 10 rad/s, Phase Angle, T 315 N/A 76 C (Future) Flash Point, C T Solubility, % 3 T 44 N/A Separation of Polymer, 163 C, 48 hours, degree C difference in R & B from top to bottom 4 ASTM D7173 AASHTO T

8 Louisiana MSCR Specification Table Force Ductility Ratio and Force Ductility test procedures removed Property Force Ductility Ratio (f 2 / f 1, 4 C, 5 cm/min., f 30 cm elongation) 5 Force Ductility, (4 C, 5 cm/min, 30 cm elongation, kg) 3 AASHTO Test Method PG82-22rm 1 PG76-22m (PG70-22m ) PG (PG64-22 ) PG58-28 Spec. Spec. Spec. Spec. Spec. T T

9 Louisiana MSCR Specification Table Property AASHTO Test Method PG82-22rm 1 PG 76-22m PG 70-22m PG PG58-28 Spec. Spec. Spec. Spec. Spec. Tests on Rolling Thin T 240 Film Oven Residue: Mass Change, % T Dynamic Shear, 10 rad/ T C G*/Sin Delta, kpa Elastic Recovery, 25 C, T cm elongation, % 6 Multiple Stress Creep Recovery (MSCR), Jnr(3.2) Multiple Stress Creep Recovery (MSCR), % Recovery (3.2) Ductility, 25 C, 5 cm/ TP na --- TP Meets AASHTO TP 70 curve Meets AASHTO TP 70 curve

10 Louisiana MSCR Specification Table Property Tests on Pressure Aging Vessel Residue: Dynamic 26.5 C, 10 rad/s, G* Sin Delta, kpa Bending Beam Creep Stiffness, S, -12 C. Bending Beam Creep Slope, m value,@ -12 C AASHTO Test Method R 28 PG82-22rm 1 PG 76-22m PG 70-22m PG PG58-28 Spec. Spec. Spec. Spec. Spec. T (6000-) (6000-) 19 C T C T C

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12 PERFORMACE : 15 YR Interstate PG 76-22m Overlay (7-9 PG 76-22m Level 2 Superpave over Rubblized JCP) IRI Cracking Rutting

13 I I I-20 (Brk/St) I I I I-10

14 Index Limits Index RUT (in/mi) IRI (in/mi) Fatigue (sqft/mi) Random (ft/mi) Very Good Good Fair Poor Based on Louisiana Pavement Management recommendations August 2010.

15 Asphalt Pavement Preservation Treatments- Interstate Triggers Treatment Alligator (sqft/mi) Random (ft/mi) Rut (in) IRI (in/mi) Microsurfacing <800 < < 125 Thin Overlay (2" mill, 2" fill) (0-100 sqyd patching) <3500 <3000 > Medium overlay (3.5" fill (mill 2" optional)) ( sqyd patching) >3000 > 125

16 80000 Average ADT Average ADT I-10 ( (1)) I-10 ( (2)) I-10 (450-04) I-10 (450-05) I-10 (450-91) I-20 (451-01) I-20 (451-06) I-20 (451-07) Brea Age (yrs)

17 0.5 Rut Average Rut (in) in =9mm I-10 ( (1)) I-10 ( (2)) I-10 (450-04) I-10 (450-05) I-10 (450-91) I-20 (451-01) I-20 (451-06) I-20 (451-07) Break Se Age (yrs)

18 in/mile = 1 meter/kilometer 135 Average IRI (in/mi) in/mi I-10 ( (1)) I-10 ( (2)) I-10 (450-04) I-10 (450-05) I-10 (450-91) I-20 (451-01) I-20 (451-06) I-20 (451-07) Break S Age (yrs)

19 3500 Alligator Cracking Alligator Cracking (sqft/mi) , are listed as composite and the PMS does not record ALGCRK for composite high points are due to very localized cracking within a 2.0 mile segment of the 20 miles of pave I-10 ( (1)) I-10 ( (2)) I-10 (450-04) I-10 (450-05) I-10 (450-91) I-20 (451-01) Age (yrs)

20 7000 Random Cracking Poor-8500 lf/mi Random Cracking (lnft/mi) lf/mi I-10 ( (1)) I-10 ( (2)) I-10 (450-04) I-10 (450-05) I-10 (450-91) I-20 (451-01) I-20 (451-06) I-20 (451-07) Break Age (yrs)

21 5000 Cracking Transverse Cracking (lnft/mi) I-10 ( (1)) I-10 ( (2)) I-10 (450-04) I-10 (450-05) I-10 (450-91) I-20 (451-01) I-20 (451-06) I-20 (451-07) Break S Age (yrs)

22 Pavement management performance rating

23 10000 Patching 7500 Patching (sqft/mi) 5000 I-10 ( (1)) I-10 ( (2)) I-10 (450-04) I-10 (450-05) I-10 (450-91) I-20 (451-01) I-20 (451-06) I-20 (451-07) Break S Age (yrs)

24 I (1) 9 years

25 Performance of all Pavements

26 IRI and Rut State System now vs 10 yrs ago State HS IRI Avg IRI (in/mi) ASP 2003 ASP Age0.4 State HS Rut Avg Rut (in) ASP 2003 ASP Age

27 40000 Fatigue Cracking state system now vs 10 yrs ago State HS fatigue crack ALGCRK (sqft/mi) ASP 2003 ASP Age

28 THIN LIFT ASPHALT SPECIFICATIONS Chris Abadie

29 Thin Overlay vs. Mil/Overlay LA yr. Performance Comparison Average IRI Proj. 1 (1998 Mill 2" and 3.5" Overlay) Proj. 2 (1997 Thin Overlay) Proj. 3 (1998 Mill 2" and 3.5" Overlay) Year

30 OGFC Conventional

31 CTM Results (Macro-Texture) 1.30 OGFC 0.98 MPD (mm) 0.65 SMA 0.33 Superpave CYCLE 100% LIMESTONE, OGFC 100% Sandstone, OGFC 70/30 LS+SS, OGFC 100% LIMESTONE, 19 mm superpave 100% Sandstone, 19 mm superpave 70/30 LS+SS, 19 mm superpave 100% LIMESTONE, 12.5 m superpave 100% Sandstone, 12.5 mm superpave 70/30 LS+SS, 12.5 mm superpave 100% LIMESTONE, SMA 100% Sandstone, SMA 70/30 LS+SS, SMA

32 Roadtec SP-200

33 5 yr Safety Record for OGFC:I 20 (Dist 05: Britton Road to Vancil Road) Wet Weather Crashes Number of Crashes >80% >70% yr avg Before 3yr Avg after 5 Year After

34 I-49 Coarse Thin Lift Natchitoches 2005

35 Performance Loaded Wheel Test (Rut, Durability, Moisture Sensitivity) Semi circular bend Test Resistance to Cracking

36 Laboratory Experiment: LWT Test Performance Indicator Resistance to Rutting and Moisture Sensitivity Test Protocol AASHTO T324 Temperature 50 C Loading Wheel Diameter: mm (8 inch) Wheel Width: 47mm (1.85 inch) Fixed Load: 703 N (158 lbs) Rolling Speed: 1.1 km/hr Passing Rate: 52 passes/min

37 P 2 P a 2s 2rd notch P 2 b Laboratory Experiment: SCB Test Performance Indicator Resistance to Crack Propagation Test Protocol Mohammad et al. [2004] Temperature 25 C Loading 0.5 mm/min vertical deformation The Critical Value of Fracture Resistance, 1 J c = ( ) b du da b = sample thickness, a = notch depth, U = strain energy to failure

38 Preliminary Analysis: Semi- Circular Bend 42% 58% 72% 0% Volum etric High Param Tempe eters Cracki ng rature Perfor Perfor mance mance

39 Preliminary Analysis: Performance Test Level 1 50% Volum etric High Param Tempe eters Cracki ng rature Perfor Perfor mance mance

40 Laboratory Experiment: Modified SCB Test Load Original Data Max of Data set Fitted Curve Peak of Curve Deformation Force (Kn) Length(mm) 1 J c = ( ) b du da

41 Contractor Lab Accreditation Number of HMA Testing Labs 39 Number of Accredited Testing Labs 31 Number of Design Labs 15 Number of Production Labs 16 Number of AMRL Accredited Labs 17 Number of CMEC Accredited Labs 14

42 Proficiency Samples G mm Data Mean Rating 5 (1SD) Rating 5 (1SD) Rating 3 (2SD) Rating 3 (2SD) Outliers Outliers

43 Proficiency Samples G mb Data Mean Ratin Ratin Ratin Ratin Outlie Outlie 2.345

44 Asphalt Works Saving Time of Construction Improving Quality Saving Money Improving the Environment Saving Lives