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An experimental study on cracking evolution in concrete and cement mortar by the b-value analysis of acoustic emission technique

Sagar, Vidya R and Prasad, Raghu BK and Kumar, Shantha S (2012) An experimental study on cracking evolution in concrete and cement mortar by the b-value analysis of acoustic emission technique. In: CEMENT AND CONCRETE RESEARCH, 42 (8). pp. 1094-1104.

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Official URL: http://dx.doi.org/10.1016/j.cemconres.2012.05.003

Abstract

Notched three point bend (TPB) specimens made with plain concrete and cement mortar were tested under crack mouth opening displacement (CMOD) control at a rate of 0.0004 mm/s and simultaneously acoustic emissions (AE) released were recorded during the experiments. Amplitude distribution analysis of AE released during concrete was carried out to study the development of fracture process in concrete and mortar specimens. The slope of the log-linear frequency-amplitude distribution of AE is known as the AE based b-value. The AE based b-value was computed in terms of physical process of time varying applied load using cumulative frequency distribution (Gutenberg-Richter relationship) and discrete frequency distribution (Aki's method) of AE released during concrete fracture. AE characteristics of plain concrete and cement mortar were studied and discussed and it was observed that the AE based b-value analysis serves as a tool to identify the damage in concrete structural members. (C) 2012 Elsevier Ltd. All rights reserved.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to Elsevier Science
Keywords: Concrete;Mortar;Crack detection;Micro cracking
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 28 Aug 2012 07:12
Last Modified: 28 Aug 2012 07:12
URI: http://eprints.iisc.ernet.in/id/eprint/44971

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