Abstract
Nondestructive examination of hydraulic structure is very important for the estimation of the life cost. While the various examination methods have been proposed for the concrete structure, the results should be compared with the other method to confirm the measured value. The method using the electric exploration is examined for the concrete structure in this paper. Although the electric exploration method is easy and inexpensive, the noise of measurement has to be treated appropriately. Moreover, the electrode has to be designed to be easily attached on the concrete surface. In this paper, the averaging method using the genetic algorism is examined to treat the noise for the tomography. The adhesive pad with metal foil is designed as an electrode, which is found to be successfully functioned. The tomography is used to identify the thickness of the concrete slab. The depth of fracture is also identified with the electric exploration. In this case, the difference between the calculated and measured electric field is examined to infer roughly the depth. This method can give the rough estimation of the fracture depth on the site.
