In some ways the green movement has created a new generation of skeptics by generating doubt about the benefits of new products and services designed to mitigate human impact on the environment. But “greenwash” charges should not be lathered on the ones that really do deliver the goods. In heavy construction equipment, there is a huge opportunity for machinery to move down the green path, and some manufacturers are gingerly moving in that direction. Iowa State University Caterpillar Inc. is about to go into production with its diesel-electric dozer, which is 25% more fuel-efficient than its predecessor. Intelligent compaction is
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.