“We have been working with warm- mix additives for the past four years in many different applications,” said Kevin Riley, quality control manager with Aggregate Industries. “We see warm mix as another tool in the arsenal that can be called upon to provide options to customers in producing mixtures that perform well and are both user- and eco-friendly.”

The asphalt mix for the runway includes 15 to 20 percent recycled asphalt pavement.

SAVING ENERGY

with warm mix

Warm-mix asphalt uses 20 percent less energy to fabricate, produces 20 percent fewer greenhouse emissions and allows the potential for recycling at an even higher rate than with conventional asphalt.

billion BTUs, compared to using the traditional mix.

The existing pavement had moderate rutting, cracking and oxidation. That pavement was removed and stockpiled for use as recycled material on future projects.

Longevity

Energy conserved

The Federal Aviation Administration

(FAA) currently has no specifi cation for warm-mix asphalt, but that may change, as the Logan runway repaving took place under the FAA’s approval and as warm-mix asphalt continues to prove itself as a less energy intensive alternative. According to Bob Pelland, senior project manager with the Massachusetts Port Authority (Massport), the use of warm-mix asphalt produced 4,000 fewer tons of carbon-dioxide emissions, used 400,000 fewer gallons of diesel fuel and garnered an energy savings of 53

18 | Green & Clean

Over the past few years, Massport has worked hard to perfect its warm-mix formula.

Because it is made at a lower temperature, the asphalt will likely have a longer life, Pelland said. Craig Bailey, senior project manager with the FAA New England Region Airports Division, also believes warm-mix asphalt has the potential for longer life.

Lower emissions

Because warm-mix asphalt is laid at lower operating temperatures, the work environment is better for the crews installing the new pavement, Pelland noted.

Thermal and air emissions are lower on site and at the plant where it is produced. The manufacturing process also reduces nitrogen-oxide emissions.

Taking fl ight

Pelland believes the Runway 9-27 repaving has opened the door to an increased use of warm-mix asphalt at airports nationwide. “The FAA and the local regional

offi ce are very familiar with what we’ve done here at Logan,” Pelland said. “And that gets passed along to the headquarters pavement expert down in Washington. The FAA has a level of comfort with what we were doing here.”

“I have had a lot of calls recently from other airports now that the FAA has approved our version of it,” he added. “I’m sure there’s going to be a lot of interest around the country where it makes sense to start using warm mix.” g&c

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