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This study reports on an investigation into the grain size distribution of the railway ballast using ground-penetrating radar (GPR) and image analysis. The proposed approach relies on the hypothesis that the dimension (grading) of the ballast aggregates can influence the back-reflected spectrum received by the use of GPR. This assumption was confirmed by the finite difference time-domain (FDTD) simulations...
Ground Penetrating Radar (GPR) has proved to provide a high reliability in detecting several subsurface features such as water and gas pipes, energy and telecommunication supplies, water reservoirs or air voids. The present work uses a comparison between different central frequencies of investigation to reconstruct the network of utilities located underneath a paved surface and to understand the best...
In this work a numerical model capable to predict the electromagnetic response of railway ballast aggregates under different physical conditions has been calibrated and validated by a simulation-based approach. The ballast model is based on the main physical and geometrical properties of its constituent material and it is generated by means of a random-sequential absorption (RSA) approach. A finite-difference...
Ground penetrating radar (GPR) is widely used in the field of civil engineering, as a non-intrusive technique for road and pavement monitoring. This work presents an innovative application for mobile platforms (smartphones and tablets) for real-time GPR data processing. Our work aims at providing a useful support for engineers and technicians as well, for road and pavement inspection. According to...
Ground Penetrating Radar is frequently used for inspection the road pavement. Many applications are carried out: from pavement's layer thickness estimation, to damage detection and diagnosis, from the evaluation of geotextile effectiveness to the assessment of the bridge decks. Here we propose to integrate GPR survey with the Light Falling Weight Deflectometer. LFWD is a portable instrument that is...
A new methodology has been proposed to extract the hydraulic permittivity fields in sub-asphalt structural layers and soils from the moisture maps observed with GPR. It is effective at diagnosing the presence of clay or cohesive soil that compromises the bearing capacity of sub-base and induces damage on the road. The numerical algorithm has been yet discussed in the 11th International Conference...
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