There are a lot of flat slab concrete bridges in the U.S. that are deficient due to the greater loads being put on them by heavier trucks. A graduate student at the University of Maine has come up with a simple way to increase the capacity of these bridges by as much as 50%. Using 4-inch-wide by 0.2-inch-thick hybrid carbon/glass fiber reinforced polymer strips, Hannah Breton Loring’s system relies on ½-inch stainless-steel threaded rods epoxied into the bottom of the slab from below. These are used to attach the fiber reinforcement to the bottom of the bridge and increase the load capacity. She estimates that this approach will greatly reduce the cost of strengthening aging bridges. For the complete story, visit here.