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WAM Foam: asphalt pavements at lower temperatures

WAM Foam: asphalt pavements at lower temperatures. WMA TWG, 12 December 2007, Hunt Valley - MD. WAM Foam. Basic Concept & History Field Experience Emission Reduction US Perspective. Basic Concept. Hard asphalt component. PG 64-22. Soft asphalt component. Viscosity. Pa.s. 100000.

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WAM Foam: asphalt pavements at lower temperatures

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  1. WAM Foam:asphalt pavements at lower temperatures WMA TWG, 12 December 2007, Hunt Valley - MD

  2. WAM Foam • Basic Concept & History • Field Experience • Emission Reduction • US Perspective

  3. Basic Concept Hard asphalt component PG 64-22 Soft asphalt component Viscosity Pa.s 100000 10000 1000 100 10 1 0.5 0.2 0.1 300 210 -60 32 120 390 480 25 50 75 0 ° F Temperature

  4. Schematics of the typical process conditions TRADITIONAL HOT MIX ASPHALT 5% FILLER 20 OC 90% AGGREGATE DRYER SILO LAYING MIXER 270-320 OF 300-350 OF 320 OF 390 OF 6% ASPHALT WAM Foam ASPHALT MIX PROCESS 5% FILLER 20 OC 90% AGGREGATE DRYER MIXER SILO LAYING 260 OF 180-220 OF 225 OF 175-200 OF 1.8 % SOFT 4.2 % HARD COMPONENT

  5. May 1999 DG 11 PG 52-28 (180/220) 1st WAM Foam 1999 (Norway)

  6. WAM Foam after two years June 2001

  7. WAM Foam installation in Hot Mix Asphalt plant 2000 Original asphalt line foam mixer New, 2nd asphalt line

  8. Aggregate > 4 mm Soft Bitumen Aggregates 0-4 mm Hard Bitumen Foam Filler Discharge Batch Plant Mixing Cycle – 3.5 ton batch 5 15 25 Time (s) 0 55 35 Mixing Mixing -

  9. Field trials RV 120 September 2000 WAM Foam, DG 11, PG58-22 (80 pen) May 2002 Reference, DG 11, PG58-22 (80 pen) May 2002

  10. 3.2 mm/year 2.9 mm/år WAM Abg 11 Rut development on RV 120

  11. WAM Foam SMA 11, Track-paving on E6 - June 2002 Daily traffic 22000 vehicles - 65,2 kg/m2

  12. Adoption to Drum Mix Plant

  13. Asphalt Fume Emission monitoring Emission measurements Source: Koenders et al, IRF 2004

  14. Emission reduction Hot MixWAM Foam Fume emissionmeasurement PLEASE NOTE: Today typical Occupational Exposure Limits in Europe and US are TPM – 5 mg/m3 In this example Hot Mix emissions are still 4 times lower than OE limit !! TPM BSM Source: Koenders et al, IRF 2004 TPM = Total Particulate Matter BSM = Benzene Soluble Matter

  15. CO2 emission during actual Production

  16. NOx and CO emission during actual Production

  17. 54 % reduction Dust emission during actual Production Production process

  18. Illustrations 230 F 311 F

  19. 230 F 329 F Illustrations HMA vs. WAM Foam

  20. What has been we achieved with WAM Foam? • 30 % reduction in energy consumption, lower production costs • 30 % reduction in CO2-emissions, a gain for the environment! • 50 – 60 % reduction in dust emission, again a gain for the environment • Fume from WAM Foam is below detection limits,Health & Safety! • Reduced temperature => reduced oxidation/ageing of binder • WAM Foam satisfies all Hot Mix Asphalt specifications according to Handbook 018 (Norwegian Standard) • Production Capacity maintained

  21. US Perspective • Binder components now available in the US • Final binders: PG 70-22, PG 64-22, PG 58-28 • Laboratory • 2007 mixing trials at Turner Fairbank / FHWA • 2007 evaluation at NCAT • Included in study Industry tour 2007 • Further US field verification 2008 • Mid West • Expand to modified grades ?

  22. US Perspective Positives (when compared to other WMA): • No Additives, no expensive snake oils – “just add water” • Pre-coats Coarse Aggregate • Absorptive Aggregates Challenges: • Paradigm Shift • Asphalt Plant Binder Blending • PG Binder Grading system • Performance Acceptance Projects • Mix Design-Lab Foaming device • Asphalt Plant Modifications

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