Accuracy of Eddy-Current and Radar Methods Used to Reinforcement Detection

Currently, the most often NDT methods used in practice to non-destructive rebar location in structures are: electromagnetic and radar methods. Both methods have some advantages, disadvantages and limitations. In work, an attempt to describe the possibilities of the particular methods with emphasizing their advantages and limitations has been made. The results of the tests conducted on a lintel beam made of AAC reinforced with small diameter rebars and with rebars placed close together have been presented. The reinforcement has been tested with two different electromagnetic scanner and a GPR device. The received results of eddy-current tests have been compared with the results of NDT tests. It has revealed that NDT tests done in this kind of element allow the correct assessment of the concrete cover but can give different results in case of shape and number of rebars.