Top Banner
Warm Mix Technology The Canadian Perspective J.Keith Davidson P.Eng. McAsphalt Industries Limited Toronto Ontario Canada CUPGA – 2007 – Niagara Falls
25

Warm Mix Technology The Canadian Perspective

Feb 04, 2016

Download

Documents

HARLAN

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 - PowerPoint PPT Presentation
Welcome message from author
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Page 1: Warm Mix Technology The Canadian Perspective

Warm Mix TechnologyThe Canadian Perspective

J.Keith Davidson P.Eng.McAsphalt Industries Limited

Toronto Ontario Canada

CUPGA – 2007 – Niagara Falls

Page 2: Warm Mix Technology The Canadian Perspective

Agenda

• Background

• Introduction

• Processes

• Environmental Data

• Other Benefits

• The Future

Page 3: Warm Mix Technology The Canadian Perspective

Background

• Kyoto Accord

• Energy prices increasing

• Stricter environmental rules

• Emission reductions

Page 4: Warm Mix Technology The Canadian Perspective

Introduction

• 6 main processes

– Aspha-min– Sasobit– Wam Foam– Low Energy asphalt– Astec Process– Evotherm

Page 5: Warm Mix Technology The Canadian Perspective

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

Page 6: Warm Mix Technology The Canadian Perspective

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

Page 7: Warm Mix Technology The Canadian Perspective

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

Page 8: Warm Mix Technology The Canadian Perspective

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

Page 9: Warm Mix Technology The Canadian Perspective

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

Page 10: Warm Mix Technology The Canadian Perspective

Astec Process

Page 11: Warm Mix Technology The Canadian Perspective

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

Page 12: Warm Mix Technology The Canadian Perspective

Process Trials

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

Page 13: Warm Mix Technology The Canadian Perspective

Aspha-min

• Trials placed in 2005 & 2006

• Construction DJL has been the contractor

• Working with Eurovia

• Various PG grades used

Page 14: Warm Mix Technology The Canadian Perspective

MTQ Project – 2006 (PG 64-34)

Page 15: Warm Mix Technology The Canadian Perspective

Sasobit

• In its infancy here• Bitumar (AC Supplier)• Working with Sasobit Consultant• 2 trials

– City of Toronto – 300t– City of Ottawa – 3000t

Page 16: Warm Mix Technology The Canadian Perspective

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

Page 17: Warm Mix Technology The Canadian Perspective

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

Page 18: Warm Mix Technology The Canadian Perspective

Evotherm

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

Page 19: Warm Mix Technology The Canadian Perspective

Evotherm Emulsion - 2007

Warm Mix

Hot Mix

Page 20: Warm Mix Technology The Canadian Perspective

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

Page 21: Warm Mix Technology The Canadian Perspective

Evotherm DAT Process

Page 22: Warm Mix Technology The Canadian Perspective

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%

Page 23: Warm Mix Technology The Canadian Perspective

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

Page 24: Warm Mix Technology The Canadian Perspective

The Future

• Tendering of projects

• Continued expansion of usage of warm mix

• High RAP mixes

Way of the future in our industry

Page 25: Warm Mix Technology The Canadian Perspective

Thank You

Questions?