Next Article in Journal
Mechanical Behavior and Failure Mode of Steel–Concrete Connection Joints in a Hybrid Truss Bridge: Experimental Investigation
Next Article in Special Issue
Identification of Stress States in Compressed Masonry Walls Using a Non-Destructive Technique (NDT)
Previous Article in Journal
Correction: Elduque, A., et al. Electricity Consumption Estimation of the Polymer Material Injection-Molding Manufacturing Process: Empirical Model and Application
Previous Article in Special Issue
Evaluation of Cracking Patterns in Cement Composites—From Basics to Advances: A Review
Open AccessArticle

Integrated Application of GPR and Ultrasonic Testing in the Diagnostics of a Historical Floor

1
Department of Mechanics of Materials and Structures, Faculty of Civil and Environmental Engineering, Gdańsk University of Technology, Narutowicza 11/12, 80-233 Gdańsk, Poland
2
Department of Technical Fundamentals of Architectural Design, Faculty of Architecture, Gdańsk University of Technology, Narutowicza 11/12, 80-233 Gdańsk, Poland
*
Author to whom correspondence should be addressed.
Materials 2020, 13(11), 2547; https://doi.org/10.3390/ma13112547
Received: 21 May 2020 / Revised: 28 May 2020 / Accepted: 1 June 2020 / Published: 3 June 2020
(This article belongs to the Special Issue Non-destructive Testing of Structures)
The paper presents the results of integrated ground penetrating radar (GPR) and ultrasonic testing (UT) measurements conducted on a historical floor in St. Nicholas’ Church, Gdańsk, Poland. The described inspection was the first stage of the technical state assessment of the building. The aim of the study was the detection of underfloor air gaps, which were observed in a few trial pits. The condition of the ground under the floor was determined by localizing other inclusions such as rubble, human remains, brick walls and pipes. To identify the phenomenon of electromagnetic and ultrasonic wave propagation within the air gap, laboratory tests were conducted on physical models consisting of two concrete slabs stacked on top of each other and gradually moved apart to simulate a slot of varying thickness. The conducted research was supported by the numerical models of electromagnetic wave propagation. The obtained results showed that the integration of the GPR and UT methods provided an effective imaging of the floor and the area under it. Ultrasonic testing was proved to be a good technique for identifying air voids, while the GPR method allowed detecting concentrated anomalies and determining the degree of ground homogeneity under the floor. View Full-Text
Keywords: non-destructive testing; historical floor; integrated diagnostics; ground penetrating radar; ultrasonic testing; in situ surveys; finite-difference time-domain modeling non-destructive testing; historical floor; integrated diagnostics; ground penetrating radar; ultrasonic testing; in situ surveys; finite-difference time-domain modeling
Show Figures

Graphical abstract

MDPI and ACS Style

Rucka, M.; Wojtczak, E.; Zielińska, M. Integrated Application of GPR and Ultrasonic Testing in the Diagnostics of a Historical Floor. Materials 2020, 13, 2547.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop