Products 01/19/2011 Tier 4-Compliant Off-Road Truck: Meets Emissions Regs As new EPA emissions regulations take effect in 2011, Tier 4-compliant machines are gaining ground. Set to debut in North America at CONEXPO-CON/AGG later this year, the G Series 775 Off-Highway Truck will be the first Cat machine to go into production with a Tier 4 final emissions solution. Caterpillar Inc.; 309-675-8995; www.cat.com Demo Hammer: Lightweight Design At the World of Concrete 2011 trade exposition, Makita featured some of its latest demolition hammers, including the corded 11-lb HM0870C. The hammer has a variable speed control, managing 1,100 to 2,650 blows per
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.