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Ministry of Transportation Ministry of Transportation
Warm Mix Asphalt
2013 OHMPA Fall Seminar December 11, 2013
Seyed Tabib
Bituminous Section
Ministry of Transportation of Ontario
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October 29, 2003
Materials Engineering and Research Office
Ministry of Transportation
2
Overview
• WMA Definition
• Benefits of WMA
• Challenges of WMA
• MTO WMA Contracts
• QA Results
• Energy Savings on MTO WMA Contracts
• WMA Task Group
• WMA Specification Requirements
• Closing Remarks
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October 29, 2003
Materials Engineering and Research Office
Ministry of Transportation
3
WMA Definition
MTO adopted NAPA’s Definition of WMA
• A group of technologies which allow a reduction in the
temperatures at which asphalt mixtures are produced and
placed. WMA can be separated into 3 categories:
• Chemical Processes
• Organic Additives
• Foaming Processes
• WMA allows compaction temperature to be reduced by
20-50oC while still achieving adequate compaction.
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October 29, 2003
Materials Engineering and Research Office
Ministry of Transportation
4
Benefits of WMA
When compared to Hot Mix Asphalt (HMA), WMA
benefits include:
• Reduced asphalt plant emissions
• Reduced paving crew exposure to fumes
• Reduced fuel consumption
• Improved compaction and better joints
• Facilitates higher recycled asphalt pavement (RAP)
content in the mix
• Less asphalt aging and the potential for reduced cracking
• Facilitates longer hauling distances
• Facilitates late season paving
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October 29, 2003
Materials Engineering and Research Office
Ministry of Transportation
5
Challenges of WMA
• Costs?
• Effectiveness of different technologies – not all are the
same
• Ensuring long term performance including moisture
susceptibility
• Mix design procedure
• Recyclability
• Restrictions/adjustments at the asphalt plant
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October 29, 2003
Materials Engineering and Research Office
Ministry of Transportation
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MTO WMA Contracts
• MTO has paved about 500,000 tonnes of WMA
since 2008.
• WMA technologies included Chemical and Organic;
no Foaming technology has been used on MTO jobs
• In 2011, WMA accounted for 10% of total asphalt
paved on provincial highways.
• MTO set a 15% target for 2013 and 2014.
• Pavement performance of WMA has been
comparable to HMA with slightly better joint quality.
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October 29, 2003
Materials Engineering and Research Office
Ministry of Transportation
7
HMA
HMA
WMA
WMA
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October 29, 2003
Materials Engineering and Research Office
Ministry of Transportation
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QA Results
• In general, the lot mean compaction for WMA was
either equal to or higher than HMA.
• WMA was paved at temperatures 10-30oC lower
than HMA without any adverse effect on mix
properties or compaction.
• TSR results on production WMA samples were
significantly variable with values ranging from 44
to 117 percent.
• Hamburg rut depths were comparable between
WMA and HMA.
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October 29, 2003
Materials Engineering and Research Office
Ministry of Transportation
9
Energy Savings on MTO WMA Contracts
• Replacing HMA with WMA on our contracts has
saved an estimated 31,200 Giga Joules of energy.
• This energy saving is equal to 900,000 litres of
diesel fuel, the equivalent of taking 126,000
vehicles off the roads for one day.
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October 29, 2003
Materials Engineering and Research Office
Ministry of Transportation
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WMA Task Group
• An MTO/Industry WMA Task Group was formed in late
2010 to further investigate WMA and improve MTO’s
specification. Issues under discussion included:
• Mix design, PGAC (Performance Graded Asphalt Cement)
selection, moisture sensitivity, rutting resistance,
performance testing, RAP content, field performance, and
emissions.
• Other objectives of the WMA Task Group would include:
• Compiling a WMA state of the practice guide
• Developing mix design procedures for WMA
• Developing a WMA guideline for contractors
• Developing educational material to promote WMA use
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October 29, 2003
Materials Engineering and Research Office
Ministry of Transportation
11
WMA Specification Requirements
• Superpave mix design according to LS-318
• Flow Number (for info only)
• Coating test
• Compactability test
• Minimum TSR of 80% is required
• TSR on the production samples performed by QA lab
(for info only)
• Provide WMA supplier’s recommendations
• Contractors are encouraged to record the fuel usage
at the asphalt plant during WMA/HMA production.
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October 29, 2003
Materials Engineering and Research Office
Ministry of Transportation
12
Closing Remarks
• WMA is an innovative green technology that reduces greenhouse
gas and fuel consumption while improving compaction.
• MTO experience with WMA has been positive.
• MTO will continue to work with WMA Task Group to improve our
WMA specification.
• Given the environmental benefits and potential performance
improvements, the life cycle cost of WMA is expected to be
similar to HMA.
• In addition to the permissive specification, MTO is specifying
WMA in up to 15% of total asphalt quantity for 2013 and 2014.
• This 2-year program will allow the asphalt industry to invest in
WMA technology and increase WMA use.
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Ministry of Transportation Ministry of Transportation
Thank You
Seyed Tabib, P. Eng. Bituminous Section
Materials Engineering and Research Office
Tel: 416-235-3544
Email: [email protected]