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Open AccessLetter

The Use of Non-Destructive Testing (NDT) to Detect Bed Joint Reinforcement in AAC Masonry

1
Department of Building Structures, Silesian University of Technology, ul. Akademicka 5, 44-100 Gliwice, Poland
2
Department of Building Structures and Laboratory of Civil Engineering Faculty, Silesian University of Technology, ul. Akademicka 5, 44-100 Gliwice, Poland
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(13), 4645; https://doi.org/10.3390/app10134645
Received: 29 May 2020 / Revised: 27 June 2020 / Accepted: 2 July 2020 / Published: 5 July 2020
(This article belongs to the Special Issue Structural Health Monitoring & Nondestructive Testing 2020)
Detecting non-metallic reinforcement made of FRP (Fibre Reinforced Polymers) can be problematic, particularly at the stage of work inspection and constructional evaluation. In contrast to steel reinforcement, detecting non-metallic reinforcement is difficult using NDT (Non-Destructive Testing) techniques. These difficulties mainly arise from considerably lower density, radiation resistance or electromagnetic impedance and cross-section of rebars when compared to steel reinforcement. Specific problems with the reinforcement detection are experienced in masonry structures, in which reinforcement is laid in bed joints. Measurements are made on a masonry face in the plane perpendicular to the reinforcement plane, and not the parallel one compared to reinforced concrete structures. Thus, the interpretation of results obtained from NDT can be complicated due to many physical phenomena occurring during tests, methods of presenting measurements and their accuracy. This paper compares different testing techniques used to detect non-metallic reinforcement in the masonry wall made of autoclaved aerated concrete (AAC). For the purpose of the tests, fibreglass and basalt meshes, traditional steel trusses and steel wire meshes were placed in bed joints of the masonry wall. An ultrasonic tomography and GPR (Ground-Penetrating Radar) scanner operating within a broad range of frequencies were used for the tests. We also used the electromagnetic device to detect metal meshes. As expected, the tests confirmed problems with detecting the non-metallic reinforcement. Only the radar method was effective in detecting the non-metallic method, whereas other methods failed. The electromagnetic method detected only the steel reinforcement in the masonry. View Full-Text
Keywords: rebar location; FRP reinforcement; NDT methods; GPR testing; ultrasonic testing; electromagnetic testing; bed joint reinforced masonry; autoclaved aerated concrete (AAC) rebar location; FRP reinforcement; NDT methods; GPR testing; ultrasonic testing; electromagnetic testing; bed joint reinforced masonry; autoclaved aerated concrete (AAC)
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MDPI and ACS Style

Drobiec, Ł.; Jasiński, R.; Mazur, W. The Use of Non-Destructive Testing (NDT) to Detect Bed Joint Reinforcement in AAC Masonry. Appl. Sci. 2020, 10, 4645.

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