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Ductility of high performance cementitious composites

Title: Ductility of high performance cementitious composites
Author(s): A. Katz
Paper category : conference
Book title: International RILEM Symposium on Concrete Science and Engineering: A Tribute to Arnon Bentur
Editor(s): K. Kovler, J. Marchand, S. Mindess and J. Weiss
Print-ISBN: 2-912143-46-2
e-ISBN: 2912143586
Publisher: RILEM Publications SARL
Publication year: 2004
Pages: 117 - 127
Total Pages: 11
Nb references: 9
Language: English

Abstract: Very high strength cementitious composites are known to be very brittle and fiber reinforcement is often proposed as a solution to increase their ductility. In the current study, very high strength cementitious composites with extremely high ductility were developed, using up to 9% steel fibers (by volume) while maintaining a workable mix. Three types of fiber were used, either alone or in a hybrid form: Macro-size fiber: high strength hooked ends (l=30 mm), Meso-size fiber: high strength straight (l=6 mm), and Micro-size fiber: high strength - 25µm thick flat fibers (l=5 and 15 mm). High flexural strength of about 40 MPa was achieved in most of the composites, combined with enhanced ductility and strain hardening behavior. When only micro-size fibers were used the strain hardening behavior was limited and soon after attaining the peak load, a drop in load occurred. Hybrid reinforcement combining macro with meso-size fibers, at a total volume of ~6%, yielded approximately the same flexural strength but with improved ductility in the post-peak zone. It appears that hybridization of different types of fibers, with each one contributing at a different level of strain and crack opening can optimize the properties of the composite.

Online publication: 2004-02-04
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143586.011

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