GPR survey for reinforcement of historical heritage construction at fire tower of Sopron

Kanlı, Ali Ismet; Taller, Gabor; Nagy, Péter; Tildy, P.; Prónay, Zsolt; Törös, E.

doi:10.1016/j.jappgeo.2014.11.005

Cited by 27 publications

(12 citation statements)

References 7 publications

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“…This paper applies 3DGPR to explore the presence or irregularities in the subsurface of a roughly finished sandstone wall. There are examples of the application of GPR across the surface of smooth wall sections with the goal of detecting voids, either intentionally placed or resulting from deterioration [8,9]. This technique has also aided in the detection of metal objects within wall sections, such as pins and bracings, supporting the findings of desk studies during restoration works [10].…”

Section: Introductionmentioning

confidence: 88%

“…These cores have a different dielectric permittivity than the rest of the wall section. This is most commonly observed to correspond with a shift between mediums, such as the transition between stone and void or by crossing between materials of differing structural properties [8]. The implication is that a mechanism must be operating at this elevation of the wall to create this response.…”

Section: Processingmentioning

confidence: 99%

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3DGPR for the Non-Destructive Monitoring of Subsurface Weathering of Sandstone Masonry

et al. 2019

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Remote sensing techniques, such as LiDAR and photogrammetry, are used by researchers exploring the spatial distribution of weathering features in historic masonry. These well-established tools provide users with a perspective of the processes affecting the surface of masonry blocks; however, they cannot provide information on the alteration occurring subsurface. Geophysical tools are being explored as a potential approach to observe the variation in material properties beneath masonry block surfaces and to examine the patterns of deterioration across wall sections. Applying such techniques inform the development of conceptual models of weathering at the block to building wall scale. In this study, ground-penetrating radar (GPR) was selected to inspect the subsurface condition of the wall section of an historic church wall, where areas of granular disintegration and flaking can be observed. 3DGPR was selected for this task, as its use of regular grids during data collection make it better suited for detecting features within an area. Three high-frequency antennas, 1.2 Ghz, 1.6 Ghz and 2.3 Ghz, were run across the study area in a series of 80 cm by 80 cm grids. The data were collated within GIS, where observed features were annotated onto a schematic of the wall surface. The 3DGPR outputs identified anomalies within this structure that could not have been as easily interpreted using a 2DGPR transect. However, as 3DGPR relies upon interpolative techniques to estimate the returns between observation transects, the validity of features detected in these locations need to be tested. The results of this application of 3DGPR identified variable weathering response across the wall section, relative to elevation. These observations were used to develop a conceptual model linking these findings to seasonal variation in the capillary rise of groundwater, upward from the base of the church wall. Through these findings it is possible to see how GPR can assist in developing our understanding of the processes threatening heritage buildings.

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Section: Introductionmentioning

confidence: 88%

Section: Processingmentioning

confidence: 99%

3DGPR for the Non-Destructive Monitoring of Subsurface Weathering of Sandstone Masonry

et al. 2019

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“…; Kanli et al . ). Using GPR survey in archaeological sites, we can define the location and positioning of voids, the presence and characteristics of different construction materials (e.g., Leckebusch ; Conyers ) and the presence and level of humidity (e.g., Binda, Lenzi and Saisi ).…”

Section: Introductionmentioning

confidence: 97%

GPR measurements to identify cracks and textural arrangements in the altar wall of the 16th‐century Santa Maria Huiramangaro Church, Michoacán, Mexico

Ortega‐Ramírez

Bano

Larrea‐López

et al. 2019

Near Surface Geophysics

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A three‐dimensional ground‐penetrating radar survey was performed on the altar wall, which faced the risk of collapse, of a 16th‐century church in Michoacán, Mexico. The ground‐penetrating radar survey with high‐frequency antennas aimed to locate structural cracks and texture arrangements, the latter through the interpretation of the patterns in the electromagnetic data. The results indicate that the superficially visible cracks or fractures, except for the lateral ones at each end of the wall, disappear at a depth of between 15 and 25 cm. The lower part of the wall below a height of 3.97 m presents an area with multiple diffractions, which suggests that the masonry is made of ‘stone and mud’ and the tilt appears precisely where the adobe wall starts. Using 1500 and 900 MHz antennas, the identified texture of the wall shows at least three leaves or layers with diverse materials and a wooden beam embedded in the wall. Additionally, the survey near the church with a 200 MHz antenna supports the hypotheses that local construction materials were used here. The results inspire us to continue applying ground‐penetrating radar, a non‐destructive method, to diagnose the walls and structures of historical monuments before any intervention.

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“…Ground penetrating radar is a non-destructive technique used to assess the location and depth of underground targets [1,2]. It is based on the emission, by an antenna coupled to the ground, of short electromagnetic pulses, of harmonic waves confined to a certain frequency band.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Variation in Humidity of the Medium on the GPR Radar Response

Mostapha

Alsharahi

Faize

et al. 2020

The 14th International Conference on Interdisciplinarity in Engineering—INTER-Eng 2020

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This work presents research on the influence of the variation in humidity of the medium on the Ground-penetrating radar GPR response. During this research, we used a GPR SIR 3000 system coupled with a 400 MHz frequency antenna, and GprMax and Reflexw software, which are based on the numerical method known as finite difference in time domain (FDTD). The results obtained (experimental and by simulation) have shown that the reflection force and the penetration depth of GPR waves are strongly related to the physical properties of the objects and the medium inspected. The increase in the conductivity of the inspected medium causes areduction inthe depth of the GPR waves, which causes the non-detection of objects.

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GPR survey for reinforcement of historical heritage construction at fire tower of Sopron

Cited by 27 publications

References 7 publications

3DGPR for the Non-Destructive Monitoring of Subsurface Weathering of Sandstone Masonry

3DGPR for the Non-Destructive Monitoring of Subsurface Weathering of Sandstone Masonry

GPR measurements to identify cracks and textural arrangements in the altar wall of the 16th‐century Santa Maria Huiramangaro Church, Michoacán, Mexico

Effect of the Variation in Humidity of the Medium on the GPR Radar Response

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