Pavement Testing Using Nondestructive MASW Approach

Gohil, RR and Kumar, J and Parthasarathy, CR (2023) Pavement Testing Using Nondestructive MASW Approach. In: 2023 Geo-Congress: Sustainable Infrastructure Solutions from the Ground Up - Geotechnical Characterization, 26 - 29 March 2023, Los Angeles, pp. 163-172.

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Abstract

In this study, the MASW testing was carried out on asphalt pavement using several accelerometers and geophones to characterize the stiffness profile of the pavement. Park's phase-shift method was applied to the experimental data to obtain the dispersion image in the frequency-phase velocity domain. Typical pavement structures have high stiffness layers, such as the asphaltic or concrete layer above the underlying less stiff subgrade. The dispersion image for such a case shows an increasing trend of phase velocity with increased frequency, which contrasts with the normally dispersive soil profiles. This obtained dispersion curve can be easily mistaken as a single continuous curve for inversion analysis, leading to errors in the obtained profile of the pavement, which includes shear wave velocity (VS) and thickness of each layer (h). The predominant modes obtained from the fast delta matrix method for assumed pavement layers are matched with the effective dispersion curves obtained from experiments to obtain the correct results for properties of each layer. The automatic inversion using Monte Carlo-based global search algorithm gives a pavement profile that matches the extracted core sample results. © 2023 American Society of Civil Engineers (ASCE). All rights reserved.

Item Type:	Conference Paper
Publication:	Geotechnical Special Publication
Publisher:	American Society of Civil Engineers (ASCE)
Additional Information:	The copyright for this article belongs to American Society of Civil Engineers (ASCE).
Keywords:	Phase velocity; Shear flow; Shear waves; Soils; Stiffness, Concrete layer; Dispersion curves; Dispersive soils; High stiffness; Non destructive; Pavement structures; Pavement testing; Phase-shift method; Soil profiles; Stiffness profiles, Dispersion (waves)
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	29 May 2023 03:14
Last Modified:	29 May 2023 03:14
URI:	https://eprints.iisc.ac.in/id/eprint/81533

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