Application of Impact-echo Method to Degradation Diagnosis of Existing Coastal Structures

Abstract

ABSTRACT：Fishing port facilities are the main coastal structure in fishing village and form a large number of existing stocks for which introduction of life-cycle management such as durability upgrading and life extension measures is needed. To this end, degradation level of the facilities must be known and the degradation diagnosis must take into account the particularity of each facility. Hence, the scatter in diagnosis results by operator and inefficiency of diagnosis procedure should be eliminated by clear evaluation criteria and labor saving diagnosis procedure. This study aims at establishing a degradation index and simplification of diagnosis procedure applicable to the fishing port facilities. Applicability of impact-echo method using surface P-wave to the degradation diagnosis of fishing port facilities was investigated for the first time in terms of effects of moisture content and expansive cracks of concrete. Finally, accuracy and applicable range of the diagnosis method were studied using existing fishing port facilities.