A new trial of nondestructive evaluation of concrete structure by an impact elastic wave method integrating adaptive signal processing

2015 Fiscal Year Final Research Report

• Project/Area Number: 26630203
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Civil engineering materials/Construction/Construction management
• Research Institution: Osaka University
• Principal Investigator: Kamada Toshiro 大阪大学, 工学(系)研究科(研究院), 教授 (10224651)
• Co-Investigator(Kenkyū-buntansha): UCHIDA SHINYA 立命館大学, 理工学部, 講師 (70543461)
• Co-Investigator(Renkei-kenkyūsha): TERASAWA KOKI 大阪大学, 大学院工学研究科, 助教 (50750246)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: 衝撃弾性波 / 伝達関数 / PCグラウト充填 / 適応ノイズキャンセル処理 / 非破壊評価手法

Outline of Final Research Achievements

In this study, an “impact elastic wave method integrating adaptive signal processing” was developed by theoretical analysis of “adaptive noise cancelling process based on the acoustic transfer function model”. Thus, this system was applied to detect the defects in the low SN ratio region where the elastic wave reflected at the defect was far smaller than the surface wave exited by an impact. Specifically, placing a number of sensors on the concrete and using adaptive noise cancelling process for the detected signals of the sensors, the reflected wave from the defects was separated successfully by cancelling the surface wave. The main application of the method was evaluation of PC grouting condition in post-tensioning tendon ducts of PC Members. Finally, the method was found effective for these applications.

Free Research Field

土木工学　コンクリート工学　維持管理工学　非破壊検査