U.S. Army R&D fiber-reinforced polymers (FRP)
Dr. Guillermo Riveros, a research civil engineer with the U.S. Army Engineer Research and Development Center’s Information Technology Laboratory shows two versions of fiber-reinforced polymers (FRP) used in repairing fatigue-induced cracks on steel structures. On the right are before and after photos of repairs using FRP on Old Hickory Lock in 2015. (U.S. Army Corps of Engineers Courtesy Photo)

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Photo by: U.S. Army Corps of Engineers |  VIRIN: 221014-A-EN999-001.JPG