GPR Analysis of Water Content in Concrete Specimen - Laboratory Test

Santos-Assunçao, Sonia; Krishna, S.; Pérez-Gracia, Vega

doi:10.3997/2214-4609.201601974

Cited by 2 publications

(2 citation statements)

References 7 publications

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“…The dominant frequency and bandwidth, determined in the frequency domain, are related to the moisture content or to the presence of certain contaminants in the investigated medium [38,39]. The difference in the electromagnetic properties of the investigated media will cause, according to the theory of wave propagation, a change in the reflected waves.…”

Section: Methodology and Instrumentationmentioning

confidence: 99%

Optimization of Dominant Frequency and Bandwidth Analysis in Multi-Frequency 3D GPR Signals to Identify Contaminated Areas

Paredes-Palacios

Mota-Toledo²,

Biosca

et al. 2022

Sensors

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Ground-penetrating radar (GPR) has been widely used in investigations of contaminated areas because of its sensitivity to variations associated with the nature of pore fluids. However, most of the studies were usually based on the visual interpretation of radargrams or on a time domain amplitude analysis. In this work, we propose a methodology that consists of analyzing the spectral content of the signal recorded in multi-frequency 3D GPR profiles. A remarkable advantage of this type of antenna is its step-frequency system, which provides a much wider emission spectrum than the one corresponding to conventional single-frequency antennas. From the data in the frequency domain, the dominant frequency and bandwidth were calculated as parameters whose variation could be related to the presence of light non-aqueous phase liquid (LNAPL) in the subsurface. By analyzing the variations of these two parameters simultaneously, we were able to delimit the contaminated zones in a case study, associating them with a significant shift of the frequency spectrum with respect to the average of the study area. Finally, as a validation method of the proposed methodology, the results of the frequency analysis were compared with resistivity data obtained with an electromagnetic conductivity meter, showing a very good correlation between the results.

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Section: Methodology and Instrumentationmentioning

confidence: 99%

Optimization of Dominant Frequency and Bandwidth Analysis in Multi-Frequency 3D GPR Signals to Identify Contaminated Areas

Paredes-Palacios

Mota-Toledo²,

Biosca

et al. 2022

Sensors

View full text Add to dashboard Cite

show abstract

“…Frequency analysis was also included in laboratory resolution studies [65], comparing the frequency spectrum in air and in different media, which reduce the center frequency, the amplitude, and the bandwidth. Some studies focused on the detection of changes in water content in concrete determine also that the center frequency and the bandwidth decreases as water content increases [66,67], even though the main objective was the analysis of the wave amplitude, analyzing in some cases the spectra amplitude attenuation depending on the water content [68]. The analysis of the spectrum behavior combined with backscattering was also applied in the study of shallow geology to detect seasonal subterranean streams, differentiating between active and non-active streams [69] and in the study of compaction and moisture in sandy loam [70].…”

Section: The Frequency Spectrummentioning

confidence: 99%

GPR Spectra for Monitoring Asphalt Pavements

2020

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Ground Penetrating Radar (GPR) is a prospecting method frequently used in monitoring asphalt pavements, especially as an optimal complement to the defection test that is commonly used for determining the structural condition of the pavements. Its application is supported by studies that demonstrate the existence of a relationship between the parameters determined in GPR data (usually travel time and wave amplitude) and the preservation conditions of the structure. However, the analysis of frequencies is rarely applied in pavement assessment. Nevertheless, spectral analysis is widespread in other fields such as medicine or dynamic analysis, being one the most common analytical methods in wave processing through use of the Fourier transform. Nevertheless, spectral analysis has not been thoroughly applied and evaluated in GPR surveys, specifically in the field of pavement structures. This work is focused on analyzing the behavior of the GPR data spectra as a consequence of different problems affecting the pavement. The study focuses on the determination of areas with failures in bituminous pavement structures. Results epitomize the sensitivity of frequencies to the materials and, in some cases, to the damage.

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GPR Analysis of Water Content in Concrete Specimen - Laboratory Test

Cited by 2 publications

References 7 publications

Optimization of Dominant Frequency and Bandwidth Analysis in Multi-Frequency 3D GPR Signals to Identify Contaminated Areas

Optimization of Dominant Frequency and Bandwidth Analysis in Multi-Frequency 3D GPR Signals to Identify Contaminated Areas

GPR Spectra for Monitoring Asphalt Pavements

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