PHOTO Courtesy of Michigan State University Nizar Lajnef installs a battery-less, vibration-powered sensor to record asphalt cracking, creating a data time line of its breakdown. Related Links: How Sensors on I-10 Twin Span Bridge Reduce Unknowns Bridge Owners Toolbox: Sensors, Gauges, Radars, Models Researchers are testing novel infrastructure-monitoring sensors on roads. The new sensors are powered by passing vehicles.The test could address a major flaw in sensors that are embedded to monitor degradation of infrastructure: They lose power, says Nizar Lajnef, assistant professor of civil and environment engineering at Michigan State University."Battery-powered sensors last only two to three years, max,"
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.