Warm Mix Asphalt

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Warm Mix Asphalt

• European Scan Tour

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What is WMA?

• Appear to allow a reduction in the temperatures
  at which asphalt mixes are produced and placed
• Reduced viscosity at lower temps
• Complete aggregate coating

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Why WMA?

• Potential Advantages
• Energy Savings
• Decreased Emissions
• Visible
• Non-Visible
• Decreased Fumes
• Decreased Oxidation Hardening
• Decreased Plant Wear

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Hot Mix Asphalt 320F
Warm Mix Asphalt 250F
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Technology Overview

• Materials Processing
• Two Component Asphalt Binder
• WAM-Foam
• Mix additives
• Mineral
• Aspha-Min
• Organic
• Sasobit, Asphaltan B
• Emulsions
• Evotherm

KOLO
FHWA does not endorse any particular proprietary
product or technology.
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WMA Questions

• Compatibility with US?
• Mix designs
• Equipment
• Climate conditions
• Work practices
• Success in Europe Success in US?

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WMA Questions

• Investigation into
• Long term performance
• Cost benefits
• Plant operations
• Definite reduction in fuel, fumes, emissions?
• Control of mixing process
• Workability at the paving site
• Quick turnover to traffic

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The purpose of the Warm Mix Scan

• Evaluate the different warm mix technologies,
  materials and construction practices used by
  European countries in the production and
  placement of Warm Mix Asphalt.

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Issues

• Specifications for warm mix asphalt
• Binder testing methods
• Recovery
• Ageing conditions
• Technology Effects
• Fischer Tropsch Wax
• Additional moisture added during process
• Composite PG grade (soft hard binder)