 This study examined the capabilities of two common non-destructive testing, NDT, methods, ground penetrating radar, GPR, and phased array ultrasound, PAU, in detecting fiber-reinforced polymer, FRP, bars embedded in concrete structures. The results showed that GPR was able to detect GFRP in carbon FRP, CFRP, bars to varying degrees depending on the antenna center frequency, while PAU was only able to detect GFRP in CFRP bars. These findings suggest that further research and development should be done to improve the capabilities of these NDT methods for detecting embedded FRP bars. This article was authored by Kranit Mullah, Syed Saman Kedmet Gozer-Daladi, Jesus D. Ortiz, and others.