構造物調査・診断 (2)

[V-219] Development of investigation technology for internal defects of concrete structure Vol.1

*松永 嵩¹、桒島 翔¹、藤吉 宏彰¹、礒部 仁博¹、前田 良文²、戸田 一郎² (1. 原子燃料工業、2. 西日本高速道路エンジニアリング中国)

Keywords:concrete structure, Prestressed concrete grout, Internal cavity, Nondestructive inspection, Resonant frequency

Hammering testing is generally and widely used as a nondestructive inspection method for internal defects in concrete structures from the viewpoint of ease of inspection and cost. However, one of the main issues in hammering testing is that the diagnosis result may depend on the skill of the expert, and therefore development of a reliable inspection method is desired. The present inventors are promoting development of Digital Hammering inspection technique using an acoustic emission (AE) sensor. In this report, this technology is applied to a specimen simulating various internal defects, and its applicability and issues are summarized.