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| | Abstract | | The steel tower facilities, built before the 1970s, should be reinforced for prevention of the deterioration. Practical use of the non-destructiveness exploration with easy handling and low coat is expected for maintenance and management of the facilities effectively and properly. We performed the field experiments of the real-scale foundations made of steel reinforced concrete by using the electrical exploration. As a result, it was confirmed that we can distinguish the reversed T-shaped foundations from the mat-type foundations with by using the 2D electrical exploration while the size of the foundation is indistinct. However, it is possible to estimate the size of the foundation (5.2m x 5.2m x 1.5m) as the low resistivity zone with approximate accuracy of 25cm (5% of the foundation size) by using the 3D electrical exploration. The large low resistivity zone can be appear as a false image on the apparent resistivity section, because the current flows through a part of the steel tower above the ground surface at some electrode arrays. It is necessary to use the electrode array such as the dipole-dipole to evade the influence. As a future problem, we examine the applicability for the foundation of plain concrete. |
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