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Title: Flexural strain and crack width measurement of steel-fibre-reinforced concrete by optical grid and electrical gauge methods
Authors: Robins, Peter J.
Austin, Simon A.
Jones, Peter A.
Keywords: Crack detection
Fibre reinforcement
Fracture toughness
Image analysis
Issue Date: 2001
Publisher: © Elsevier
Citation: ROBINS, P.J., AUSTIN, S.A. and JONES, P.A., 2001. Flexural strain and crack width measurement of steel-fibre-reinforced concrete by optical grid and electrical gauge methods. Cement and Concrete Research, 31(5), pp. 719-729.
Abstract: A research programme is discussed, which has investigated the fracture of steel-fibre-reinforced sprayed concrete under flexural loading, with the aim of developing a stress-block model to predict flexural behaviour in the form of a load–deflection response. This paper reports the work associated with establishing the strain and crack width profiles in relation to mid-span beam deflection. A strain analysis technique is described, which combines the use of electrical strain gauges with a semiautomated grid method (using digital image processing) for measuring and monitoring the strain and crack width profile over the depth of a fibre-reinforced beam during a flexural test. This novel strain analysis technique has established strain/crack width data, which forms a key part of a stress-block approach for predicting residual flexural strength, an essential requirement of a much needed design rationale for steel-fibre-reinforced concrete.
Description: This journal article was published in the journal, Cement and Concrete Research [© Elsevier] and the definitive version is available at: http://dx.doi.org/10.1016/S0008-8846(01)00465-3
Version: Accepted for publication
DOI: 10.1016/S0008-8846(01)00465-3
URI: https://dspace.lboro.ac.uk/2134/5030
ISSN: 0008-8846
Appears in Collections:Published Articles (Architecture, Building and Civil Engineering)

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