• Thomas R. Hay, Ph.D., P.E

Combining Ultrasonic Testing (UT) and Ground Penetrating Radar (GPR) for Anchor Bolt Testing

Streetlights, traffic signal lighting, traffic signage, and support beams are often installed and secured using steel anchor bolts embedded in steel rebar reinforced concrete. Depending on the age of the system, the condition of construction grade bolts and the footer may affect the load bearing capacity of the system. In some cases, damage may be incurred, and a fitness-for-service assessment is required. In many instances the design and fabrication specifications are unavailable and the type of anchor bolt, concrete and rebar system are unknown. The article discusses how ultrasonic non-destructive testing (NDT) and ground penetrating radar (GPR) can be used to test anchor bolts and the concrete – rebar system.