Boston’s Logan International Airport repaved Runway 9-27 using warm-mix asphalt, saving energy and reducing emis- sions during reconstruction.

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FACTS

Warm mix is the general term used to describe technology that allows crews to mix and place asphalt at lower temperatures. The results are:

• Energy savings • Emissions reductions • The use of recycled material in the mix.

The $12.5 million project spanned seven weekends between June and September 2009. Crews placed about 50,000 tons of warm mix asphalt on the 7,000-foot-long, 150-foot-wide runway, which is one of six at the 12th-busiest airport in the U.S.

The contractor was J.F. White Contracting Co. with Aggregate Industries serving as the subcontractor. HNTB Corp. designed the project and furnished construction inspection services.

The U.S. transportation construction industry has long been a leader in materials recycling — saving taxpayers money on publicly-funded highway projects and simultaneously reducing demands on landfi lls, quarries, gravel pits and in petroleum use. According to the National Asphalt Pavement Association, 100 million tons of asphalt are reclaimed annually. Approximately 75 million tons are recycled and applied again as a hot-mix or warm-mix asphalt surface. The rest is used primarily in other highway- and pavement- related applications such as road base and shoulders.

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