Evotherm Warm Mix

News

• MWV Specialty Chemicals, Ergon Asphalt & Emulsion, Inc., & Mathy Construction Company Sign License Agreement for Warm Mix Asphalt (.PDF)
• TxDOT Perspective on Warm Mix Asphalt (.PDF)
• Warm Mix Keeps Asphalt Workable After Long Drive to California Coast (.PDF)
• MWV Evotherm to Demonstrate in CalTrans Warm Mix Project (.PDF)
• NYC Department of Transportation to Demonstrate Warm-mix Asphalt Innovation (.PDF)
• MWV Evotherm Selected by TxDOT for Preventative Maintenance Paving Project in Austin (.PDF)

Benefits

• Evotherm requires no equipment changes at the plant or job site.  To reduce mix temperatures, the water-based Evotherm is metered into existing materials.
• Evotherm mixes have the same aggregates, volumetrics and binder content as traditional hot mixes.
• Temperature and energy requirements are lower with Evotherm. 
• Evotherm drops into existing HMA job mix formula.
• Workability and compaction at reduced temperatures are easier than HMA, especially for coarse mixes and polymer modified asphalts.
• Traffic is returned immediately after compaction
• Evotherm binder performance matches or surpasses the qualities found in new hot mix asphalt
• Evotherm lessens the wear and tear on hot mix equipment due to its lower processing temperatures.
• Decreased emissions at the hot-mix plant (.PDF)
• Reduced job site emissons (.PDF)

Environmental Advantages

Evotherm has consistently demonstrated major reductions in emissions compared to hot mix asphalt: 

• A nearly 50 percent decrease in carbon dioxide greenhouse gasses
• A nearly 60 percent reduction in nitrogen oxides that lead to photochemical smog
• More than 80 percent drop in acid rain-causing sulfur dioxide

Energy Conservation and Savings

There are many variables associated with energy usage, but Evotherm projects have had documented energy savings up to 55 percent.  Warm mix paving projects have an initial three to seven percent difference in total job costs, however, these costs are off-set by fuel cost reductions, proportionately longer pavement lifecycle, and decreased maintenance requirements.

Engineering Reports

Download a technical brochure on how Evotherm works.

• Evotherm significantly reduces stack emissions and jobsite fumes. This report documents several projects where emissions and jobsite fume reductions were documented. Read more.
• In a report prepared for the California Department of Transportation and the University of California Pavement Research Center, the performance of warm mix asphalt was compared against traditional hot mix using the Heavy Vehicle Simulator to assess rutting behavior. Learn more about how Evotherm performed. Read more.
• The results of the lab and field studies in this report demonstrate that Evotherm can produce asphalt pavements with equal or greater durability than pavements constructed with conventional HMA technology. Read more.
• In September 2009, Evotherm 3G technology was successfully used in a high-load heavy-traffic paving job at the Ted Stevens Anchorage International Airport. Read more.
• The Crow Wing County Minnesota Department of Transportation estimates significant cost savings by paving its road network with Evotherm. This estimation is a result of paving jobs held in 2008-2009 where Evotherm's performance resulted in lower fuel consumption and a higher percentage of reclaimed asphalt pavement.  Read more.
• In April 2008, the Texas Department of Transportation (TxDOT) and the Lane Construction Corporation constructed one of the largest warm-mix asphalt projects to date using Evotherm warm-mix asphalt technology.  The National Asphalt Pavement Association awarded the project a Quality in Construction award in 2008. Read more.
• Since MWV and Eurovia collaborated in 2003 to develop the Tempera^{® /} Evotherm™ warm mix asphalt process in Europe, numerous validation tests have been conducted confirming the viability of the process. Read more about this successful collaboration. 
• On December 8, 2008, the City of New York conducted a paving trial to demonstrate the feasibility of producing and constructing Evotherm warm mix pavement during seasons of the year when ambient weather conditions prevent the use of conventional hot mix asphalt. Extremely cold and windy conditions were prevalent throughout the construction of the Evotherm pavement. Despite these unfavorable weather conditions, the Evotherm mix hauled well, extended well through paver and auger box, and compacted easily under normal compaction patterns using standard roller equipment. View the detailed report.
• The Virginia Department of Transportation conducted three trial sections of pavement using warm mix asphalt technologies, one of which was Evotherm ET. The sections were evaluated over a two-year period to assess performance of warm mix compared with traditional hot mix asphalt. Read more.
• The following trials were conducted in Canada and led by McAsphalt Industries. The outcome of the trials are detailed in the reports below and include specific information on Evotherm's sound performance and ease of use.
• • Aurora Ontario Trial (.PDF)
  • City of Calgary Trial (.PDF)
  • Ramara Township, Ontario Trial (.PDF)

The National Center for Asphalt Technology's Pavement Test Track, based at Auburn University, is broken into 200 foot test sections designed to test performance of certain asphalt mixes.  Evotherm is being tested on the track in sections E9 and E10. To view Evotherm performance on the test track, click here. 

Additional Information

You can find additional information on Evotherm at the National Asphalt Paving Association and Federal Highway Administration. 

Photos

Pictured above is an Evotherm paving job site in France.