The Massachusetts Port Authority is wrapping up a repaving job that features the first application of warm-mix asphalt (WMA) on a U.S. runway. Currently, Federal Aviation Administration specifications do not address warm-mix asphalt. However, the mix is gaining attention because of its environmentally friendly properties. Photo: Massachusetts Port Authority Warm mix goes down easy with airport engineers and contractors at Massport’s Boston Logan International Airport, which is the country’s first to embrace the environmentally friendly material. J.F. White Contracting Co., Boston, began its approximately $12-million contract in July to repave a 7,000-ft-long, 150-ft-wide runway at Boston’s Logan International Airport, says
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.