Repair Inspection in Deteriorated Concrete Member by Means of Elastic Wave Tomography

Author(s): Takahiro Nishida, Tomoki Shiotani, Katsufumi Hashimoto, Hisafumi Asaue, Yoshikazu Kobayashi, Jyunich Kagawa
Paper category: Proceedings
Book title: Proceedings of the 2nd International RILEM/COST Conference on Early Age Cracking and Serviceability in Cement-based Materials and Structures Volume 1
Editor(s): Stéphanie Staquet and Dimitrios Aggelis
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 101-106
Total Pages: 6
Language : English

Abstract: Recently, preventive and proactive maintenance of infrastructures are desired, and inspections by non-destructive testing (NDT) methods are to be applicable. In terms of damage assessment and estimation of repair and retrofit recovery in concrete structures, in addition to current NDT, innovative methods are to be established. As for the crack repair methods applied to the existing structures, inspection techniques to assess repair installations have not been practically developed yet. Eventually, there are many reports that improper repair works have resulted in “redeterioration”. Although an epoxy injection method is widely implemented to refill internal cracks from the concrete surface, it is found in most of the cases that internal defects remain unknown and potentially could lead to the re-deterioration. Therefore, inspection methods to visualize internal defects in concrete are to be readily implemented as a countermeasure for repair works. In the present study, the evaluation of repair efficiency was carried out in a reinforced concrete pier taken from an existing structure. As innovative NDT, the elastic-wave tomography was applied to evaluate three-dimensional (3D) velocity distribution before and after the repair. Penetration of the repair material and the increase in the velocity due to the repair effect were visually and quantitatively identified.

Online publication : 2017
Publication type : full_text
Public price (Euros) : 0.00

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