A semi-empirical approach for investigating mechanical properties of pavement through GPR

Benedetto, Andrea, Tosti, Fabio, D'Amico, Fabrizio and Bianchini Ciampoli, Luca (2014) A semi-empirical approach for investigating mechanical properties of pavement through GPR. In: COST Action TU1208 “Civil Engineering Applications of Ground Penetrating Radar" 2nd General Meeting, 30 April - 2 May, Vienna, Austria.

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Abstract

The wide-ranging flexibility of ground-penetrating radar (GPR), makes it one of the most effective and efficient tools in several fields of application, including pavement engineering. In such increasingly established framework, the evaluation of mechanical properties of road pavements directly from electromagnetic surveys could represent a real breakthrough toward a more efficient management of the road asset. According to the above, a pulsed GPR system with ground-coupled antennas, 600 MHz and 1600 MHz center frequencies of investigation, was employed over a 4m×30m flexible pavement test site, composed of an 836-nodes grid. Elastic moduli were measured at each node using a light falling weight deflectometer (LFWD), as ground-truth data for both model calibration and validation. Data processing has foreseen to construct a 3-D matrix of the scanned area, wherein a number of C-scans was extracted up to a maximum depth z = 200 mm, according to the influence domain of the LFWD. From the calibration procedure, a number of signal amplitude values was picked and related to a consistent amount of grid points randomly selected within each sampled C-scan. Similarly, amplitude values from other randomly selected nodes, in the same number than the calibration step, were also picked in order to validate such semi-empirical model. The comparison between observed and predicted elastic moduli shows a relatively good matching. Future developments of the research could lead to a system calibration in laboratory, under known conditions, and to the use of different center frequencies of investigation.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: GPR, ground-penetrating radar; mechanical properties; flexible pavement
Subjects: Construction and engineering > Built environment
Construction and engineering > Civil and structural engineering
Computing
Construction and engineering
Depositing User: Fabio Tosti
Date Deposited: 27 May 2016 21:44
Last Modified: 27 May 2016 21:44
URI: http://repository.uwl.ac.uk/id/eprint/2241

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