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Fiber to matrix bond mechanisms in FRC composites

Author(s): A.E. Naaman
Paper category: Conference
Book title: 8th RILEM International Symposium on Fiber Reinforced Concrete: challenges and opportunities (BEFIB 2012)
Editor(s): Joaquim A.O. Barros
Print ISBN: 978-2-35158-132-2
e-ISBN: 978-2-35158-133-9
Publisher: RILEM Publications SARL
Pages: 598 - 610
Total Pages: 12
Language: English

In fiber reinforced cement composites, the transmission of forces between the fibers and the matrix is achieved through interfacial bond. No composite action can take place without bond which is thus considered a paramount controlling variable in design. The main components of bond include physical and chemical adhesion, friction, mechanical anchorage, and fiber-to-fiber interlock. For fiber reinforced cementitious composites, bond is mostly tested through single fiber pull-out during which the applied load and the fiber slip are measured leading to a pull-out load versus slip relationship, from which a bond stress versus slip curve is derived. Such a curve can be considered a fundamental constitutive relation for bond and can vary in nature from brittle to ductile with slip-softening to slip-hardening characteristics.
Based on years of prior research and personal experience, this paper summarizes key information on bond, how it is best characterized by a bond stress versus slip response, and what variables influence its main properties, including the effects of improved adhesion, mechanical anchorage, matrix fineness, matrix strength, fiber surface conditions, rate of loading, and early age.

Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00

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