Please use this identifier to cite or link to this item: http://buratest.brunel.ac.uk/handle/2438/8937
Title: Non-destructive evaluation of cement-based materials from pressure-stimulated electrical emission - Preliminary results
Authors: Kyriazopoulos, A
Anastasiadis, C
Triantis, D
Brown, CJ
Keywords: NDT;Laboratory testing;Cement testing;Pressure-stimulated currents;Micro-cracks;Structural health monitoring
Issue Date: 2011
Publisher: Elsevier
Citation: Construction and Building Materials, 25(4), 1980 - 1990, 2011
Abstract: This paper introduces the possibility of in situ assessment of loading and remaining strength in concrete structures by means of measuring discharge of electric current from loaded specimens. The paper demonstrates that the techniques have been applied to other rock-like materials, but that for the first time they are applied to cement-based materials and a theoretical model is proposed in relation to the appearance of electrical signals during sample loading and up to fracture. A series of laboratory experiments on cement mortar specimens in simple uniaxial compression, and subsequently in bending – hence displaying both tension and compression – are described and show clear correlations between resulting strains and currents measured. Under uniaxial loading there is a well-defined relationship between the pressure-stimulated current (PSC) as a result of a monotonic mechanical loading regime. Similar results are observed in the three-point bending tests where a range of loading regimes is studied, including stepped changes in loading. While currents can be measured at low strains, best results seem to be obtained when strains approach and exceed yield stress values. This technique clearly has immense potential for structural health monitoring of cement-based structures. Both intermittent and continuous monitoring becomes possible, and given an ongoing campaign of monitoring, remaining strength can be estimated.
Description: This is the post-print version of the final paper published in Construction and Building Materials. The published article is available from the link below. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. Copyright @ 2010 Elsevier B.V.
URI: http://www.sciencedirect.com/science/article/pii/S0950061810005830
http://bura.brunel.ac.uk/handle/2438/8937
DOI: http://dx.doi.org/10.1016/j.conbuildmat.2010.11.053
ISSN: 0950-0618
Appears in Collections:Mechanical and Aerospace Engineering
Dept of Mechanical Aerospace and Civil Engineering Research Papers

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