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Bond characteristics of structural polypropylene fibres in concrete with regard to post-crack strength and durable design

Lookup NU author(s): Alan Richardson

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Abstract

Purpose - Seeks to examine the bond strength of a large range of structural polypropylene fibres, as used in concrete, to determine the most effective fibre capable of transmitting load (N/mm2) between fibre and cement within the concrete matrix. Design/methodology/approach - Following fibre selection characterised by the highest bond strength, determined from a series of pull out tests, BS flexural tests were carried out using high bond strength fibres (40 mm × 0.9 mm diameter used at 6 kg/m3) to determine whether or not structural polypropylene fibres had any effect on the ultimate flexural strength of fibre-reinforced concrete, when compared with the plain control sample. Fibre orientation, type of rupture failure mode and post-crack performance were examined. Findings - Even structural fibre dispersion was found to be best achieved with the use of monofilament polypropylene fibres (19 mm × 22 micron used at 0.9 × kg/m3) in addition to the 6 kg/m3 structural fibre dose. Structural polypropylene fibres were found not to provide additional flexural strength however, they did provide post-crack control, limiting the crack width with subsequent enhanced durability that in turn will provide lower life cycle costs. Practical implications - In addition to increased durability the use of fibre reinforcement negates the need to place steel reinforcement bars. Originality/value - Investigates the ambiguity in literature between claims made by different investigators regarding the effects of polypropylene fibres on compressive and flexural strengths. © Emerald Group Publishing Limited.

Publication metadata

Author(s): Richardson AE

Publication type: Article

Publication status: Published

Journal: Structural Survey

Year: 2005

Volume: 23

Issue: 3

Pages: 210-230

Print publication date: 01/01/2005

ISSN (print): 0263-080X

ISSN (electronic): 1758-6844

Publisher: Emerald Group

URL: http://dx.doi.org/10.1108/02630800510610143

DOI: 10.1108/02630800510610143

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