A few years ago, the use of composites, or fiber-reinforced polymers, to strengthen concrete structures was only the subject of research in the United States. Today, many companies are involved in the manufacturing, design and installation of these systems in construction projects worldwide. Reduced labor, downtime and site constraints typically offset the high material costs of FRP systems, making them very competitive with traditional strengthening techniques such as section enlargement, steel plate bonding and external post-tensioning. But despite the growing popularity of composite strengthening, the technique is still new to the concrete industry. Here are answers to some commonly asked questions about the use of FRP systems.