Effect of Input Source Energy on SASW Evaluation of Cement Concrete Pavement

Kumar, Jyant and Hazra, Sutapa (2014) Effect of Input Source Energy on SASW Evaluation of Cement Concrete Pavement. In: JOURNAL OF MATERIALS IN CIVIL ENGINEERING, 26 (6).

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Abstract

A series of spectral analyses of surface waves (SASW) tests were conducted on a cement concrete pavement by dropping steel balls of four different values of diameter (D) varying between 25.4 and 76.2 mm. These tests were performed (1) by using different combinations of source to nearest receiver distance (S) and receiver spacing (X), and (2) for two different heights (H) of fall, namely, 0.25 and 0.50 m. The values of the maximum wavelength (lambda(max)) and minimum wavelength (lambda(min)) associated with the combined dispersion curve, corresponding to a particular combination of D and H, were noted to increase almost linearly with an increase in the magnitude of the input source energy (E). A continuous increase in strength and duration of the signals was noted to occur with an increase in the magnitude of D. Based on statistical analysis, two regression equations have been proposed to determine lambda(max) and lambda(min) for different values of source energy. It is concluded that the SASW technique is capable of producing nearly a unique dispersion curve irrespective of (1) diameters and heights of fall of the dropping masses used for producing the vibration, and (2) the spacing between different receivers. The results presented in this paper can be used to provide guidelines for deciding about the input source energy based on the required exploration zone of the pavement. (C) 2014 American Society of Civil Engineers.

Item Type:	Journal Article
Publication:	JOURNAL OF MATERIALS IN CIVIL ENGINEERING
Publisher:	ASCE-AMER SOC CIVIL ENGINEERS
Additional Information:	Copyright for this article belongs to the ASCE-AMER SOC CIVIL ENGINEERS,USA
Keywords:	Cement concrete pavements; Nondestructive testing; Spectral analyses of surface waves (SASW); Source energy; Wave propagation
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	22 Jul 2014 11:40
Last Modified:	22 Jul 2014 11:40
URI:	http://eprints.iisc.ac.in/id/eprint/49420

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