Development of Non-Contact Impact Elastic Wave Methods for Surface Layer Quality and Voids of Concrete by Elastic Wave Tomography

2014 Fiscal Year Final Research Report

• Project/Area Number: 25820194
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Civil engineering materials/Construction/Construction management
• Research Institution: Ritsumeikan University
• Principal Investigator: UCHIDA SHINYA 立命館大学, 理工学部, 任期制講師 (70543461)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: 鉄筋コンクリート / 非破壊試験 / 非接触衝撃弾性波法 / 内部欠陥

Outline of Final Research Achievements

This study, first, focuses on the level of adhesive filling around a post-installed anchor bolts in concrete. In order to evaluate the level of adhesive filling qualitatively and non-destructively, exciting coil designed by elastic wave simulation. Subsequently, non-contact impact elastic wave methods developed by combine with exciting coil and laser Doppler vibrometer, attempted the level of adhesive filling. As a results, for detecting bolts with a low adhesive filling level of 50% or less, focusing on whether peaks would appear or not due to multiple reflections (due to the resonance of longitudinal waves) is effective.
By using a similar process, the feasibility of non-contact impact elastic wave methods for evaluating grouting condition in tendon ducts of existing prestressed concrete members was investigated. As a results, it is confirmed that the proposed methods are effective to be employed on existing PC members.

Free Research Field

工学