A method to detect lap splice in reinforced concrete using a combination of covermeter and GPR

A method to detect a lap splice and to estimate a summation of a diameter of the two rebars of the lap splice in reinforced concrete based on a combined utilization of covermeter and ground penetrating radar (GPR) is proposed. The performance of the proposed method is compared with the case that only one instrument is employed. The results show that the proposed method can detect the type of overlapping direction of the lap splice and estimate the summation of the diameter of the two rebars with an average error of 2.35% and standard error of estimate of 1.34 mm.