An experimental study on loading rate effect on acoustic emission based b-values related to reinforced concrete fracture

Sagar, Vidya R and Rao, MVMS (2014) An experimental study on loading rate effect on acoustic emission based b-values related to reinforced concrete fracture. In: CONSTRUCTION AND BUILDING MATERIALS, 70 . pp. 460-472.

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Abstract

This article reports on analysis of fracture processes in reinforced concrete (RC) beams with acoustic emission (AE) technique. An emphasis was given to study the effect of loading rate on variation in AE based b-values with the development of cracks in RC structures. RC beams of length 3.2 m were tested under load control at a rate of 4 kN/s, 5 kN/s and 6 kN/s and the b-value analysis available in seismology was used to study the fracture process in RC structures. Moreover, the b-value is related to the strain in steel to assess the damage state. It is observed that when the loading rate is higher, quick cracking development lead to rapid fluctuations and drops in the b-values. Also it is observed that concrete behaves relatively more brittle at higher loading rates (or at higher strain rates). The average b-values are lower as a few but larger amplitudes of AE events occur in contrast to more number of low amplitude AE events occur at low loading rates (or at low strain rates). (C) 2014 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	CONSTRUCTION AND BUILDING MATERIALS
Publisher:	ELSEVIER SCI LTD
Additional Information:	Copy right for this article belongs to the ELSEVIER SCI LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
Keywords:	Acoustic emission; Fracture; Reinforced concrete structures; b-Value; GBR relationship
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	28 Nov 2014 04:35
Last Modified:	28 Nov 2014 04:35
URI:	http://eprints.iisc.ac.in/id/eprint/50323

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