warm mix asphalt (wma) furse wma.pdf · (stone mastic, for studded tires) ... of lowering plant...
TRANSCRIPT
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Warm Mix Asphalt(WMA)
Melinda Furse
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What is WMA?
121.1C
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What is WMA?
True Warm Mix Asphalt:
• It’s HMA produced at a lower temperature and it compacts at a lower temperature.
WMA produced at any temp:
• It’s HMA with a wider compaction window
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Warm Mix Production Temperatures
120ºC
90ºC
175ºC
Conventional
Hot Mix
150ºC
Foamed Asphalt
Chemical
Additives and Wax
Often used as a coating aid.
Not a true warm mix.
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Advantages of WMA
1. Improved compaction
2. Reduced thermal segregation
3. Extended hauls and paving season
4. Longer binder life
5. Reduced emissions and fuel consumption – Improved
worker conditions – lower impact on the environment
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Compaction and
Workability
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NCAT Test Track Pavement Densities
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Case Study
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Initial Paving of HMA - SMA Mix76-28 PMA
•HMA at 170 to 175ºC
•Had Tried Foam at 150ºC on an Earlier SMA Project (Stone Mastic, for studded tires)
–Tried To Go Lower
–Could Not Achieve Density
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Hot Mix – Stone Mastic
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Very Stiff Mix
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Some Extra Hand Work
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HMA
•170º to 175ºC
•1350 – 1550 Tonnes/Day (190 Tonnes/Hr)
•Struggling With Density
–92.0 to 93.0
–Plenty of 91.5s to 92.0s
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WMA
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WMA
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WMA
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133°C
133
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No More Chunks
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WMA
•130 to 143C
•2250 Tonnes/Day (250 - 370 Tonnes/Hr)
45% Increase in Production
•No Density Struggles
94.0+ Density
Full 5% Density Bonus
$2 per Ton Bonus
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WMA Mix
•Cut 1 Roller from the Project
•Less Waste (Plant & Road)
•Less Wear on the Plant
•Less Time Cleaning Up the Paving Equipment
•Tonnes per Man Hour Went Up
•Dramatically improved compaction on a stiff SMA/PMA mix
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Longer Life Binder
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Binder hardening
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4 Years Later – The Hot Mix
WMA / May 17, 2011
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HMA
WMA / May 17, 2011
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HMA
WMA / May 17, 2011
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WMA
WMA / May 17, 2011
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Side by Side – HMA vs. WMA
WMA / May 17, 2011
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HMA vs. WMA
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Reduced Thermal
Segregation
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24 Deg Difference
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7 Deg Difference
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Hotter WMA
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80km
40%
increaseDoubles
market area
Longer hauls
120km
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Cool weather paving
Idle paving crew cost: $1000/hr
One hour incremental paving
• 250 tons
• $12,500 incremental revenue
Increase in hours for seasonal workers
• Improved employee retention
• Improved paving quality
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Reduced Emissions
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HMA vs. WMA
HMA (150°C) WMA (120°C)
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Lower emissions
HMA WMA
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How to get WMA
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How do you get Warm Mix Additives into your Asphalt?• #1 easiest way: Terminal blended
• #2: Plant add
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Evotherm pump systems
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Evotherm pump
Self contained
Fits anywhere
Simple operation
Low maintenance
Manual or plant integration
Any power supply
—4 to 20mA or 0 to 10 VDC input
—4 to 20mA or 0 to 10 VDC output
Any plant type or terminal
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Evotherm tank telemetry system
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Technical Support Team
QA/QC based approach to supporting the Warm Mix
Industry experienced technicians
• Mix design
• Production lab
• Plant setup of WMA equipment
• Roadway density
• Overall best paving practices
• Other WMA technologies
Capable of support on any mix or plant types
Regional approach to support
Services provided at no added cost
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Why not WMA?
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Why not WMA?
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Why not WMA?
• Changes the binder grade ?
• Concerns about performance ?
• No Spec
• Cost
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Spec. Language
“All SUPERPAVE Hot Mix Asphalt Mixtures shall be modified using a WMA additive capable of lowering plant production temperatures to below 260°F [125°C]. Warm Mix Asphalt additives reduce compaction effort and permit lower production temperatures than conventional hot mix asphalt. The WMA additive shall be a product listed on the Northeast Asphalt User Producer Group (NEAUPG) website (http://www.superpave.psu.edu/NEAUPG.html)...”