1 / 25

Warm Mix Technology The Canadian Perspective

Warm Mix Technology The Canadian Perspective. J.Keith Davidson P.Eng. McAsphalt Industries Limited Toronto Ontario Canada. CUPGA – 2007 – Niagara Falls. Agenda. Background Introduction Processes Environmental Data Other Benefits The Future. Background. Kyoto Accord

tireland
Download Presentation

Warm Mix Technology The Canadian Perspective

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Warm Mix TechnologyThe Canadian Perspective J.Keith Davidson P.Eng. McAsphalt Industries Limited Toronto Ontario Canada CUPGA – 2007 – Niagara Falls

  2. Agenda • Background • Introduction • Processes • Environmental Data • Other Benefits • The Future

  3. Background • Kyoto Accord • Energy prices increasing • Stricter environmental rules • Emission reductions

  4. Introduction • 6 main processes • Aspha-min • Sasobit • Wam Foam • Low Energy asphalt • Astec Process • Evotherm

  5. Aspha-min Process • Eurovia of Germany • Synthetic zeolite (Sodium Aluminum Silicate) • 21% water/ white powder • Added to mix at same time as binder • Water spray created slowly which foams binder • Gives increased workability and allows coating at lower temperature • Typically 0.3% added to mix • Temperature drops up to 30 - 35°C

  6. Sasobit Process • Sasol of South Africa • Paraffin wax made from Fischer-Tropsch process • Different cystalline structure compared to conventional waxes • Melts into binder at 110°C • Reduces viscosity of binder • Temperature reductions of 10 to 40°C • Typically 1 - 2% added to binder • Improves rutting resistance

  7. Wam Foam Process • Shell has operates the process • 2 binder component system • Soft binder and a foamed harder bitumen • Soft binder mixed at 110°C– full coating • Hard binder foamed into soft binder coated particles • Blend of hard and soft binder critical to process

  8. Low Energy Asphalt Process • Coarse aggregate heated and coated • Fine aggregate added at ambient temperature • Additives added to AC • Foaming action creates lower temperatures • Maintains workability and compaction • 100°C laydown temperatures typical

  9. Astec Process • Foaming kit on double barrel drum plant • 10 nozzle system (individually controlled) • Up to 500 tph (50 tph/nozzle) • 550 US gal water system (skid mounted) • Reduction in energy usage • Mixing temperature reductions of 30°C

  10. Astec Process

  11. Evotherm Process • Non-proprietary technology based on a chemical package • Additives to improve coating, workability, adhesion and emulsification • Two methods of production • A high residue emulsion (67-69% PGAC) • DAT Concentrate (Dispersed Asphalt Technology) • Injection system

  12. Process Trials • 5 Processes in Canada being evaluated • Aspha-min • Sasobit • Wam Foam • Astec Process • Evotherm

  13. Aspha-min • Trials placed in 2005 & 2006 • Construction DJL has been the contractor • Working with Eurovia • Various PG grades used

  14. MTQ Project – 2006 (PG 64-34)

  15. Sasobit • In its infancy here • Bitumar (AC Supplier) • Working with Sasobit Consultant • 2 trials • City of Toronto – 300t • City of Ottawa – 3000t

  16. Wam Foam • 1 trial in City of Calgary – 2005 • LaFarge retrofitted a plant to produce • Placed in August in new subdivision • Covered with surface mix • Performed well • Mixing and compaction temperatures lowered significantly

  17. ASTEC Process • 5 trials this year • New plant (double barrel green) • Can retrofit existing drum plants • Energy reductions (10-15%) • Emissions reduction • Compaction temperatures 100°C range

  18. Evotherm • 3 trials in 2005 – 1700 tonnes • 1 Trial in 2006 – 1250 tonnes • 7 Trials in 2007 – 9200 tonnes • Various PG grades used

  19. Evotherm Emulsion - 2007 Warm Mix Hot Mix

  20. Evotherm DAT Process • Concentrated solution of Evotherm • Pumped, metered & injection system • Injected into pugmill as AC is added • Chemical into AC • Creates foaming and disperses chemical

  21. Evotherm DAT Process

  22. Environmental Data – Warm Mix • Definite reductions in Greenhouse gases • reductions up to 60% • Reductions in fuel usage • 10 – 50% reduction • Reduction in fumes at paver • Up to 50%

  23. Other Benefits of Warm Mix • No mix design issues (Marshall or SuperPave or Hveem) • Physical properties equivalent to HMA • Performance properties equivalent to HMA • Reduced age hardening through plant • Longer haul distances • Excellent compaction

  24. The Future • Tendering of projects • Continued expansion of usage of warm mix • High RAP mixes Way of the future in our industry

  25. Thank You Questions?

More Related