Ductility in fiber cement-based materials; a multi-scale approach

Author(s): E. Schlangen (Invited speaker) , F. Montero, M. G. S. Beltran, A. Ozbora, C. Aydin
Paper category: Proceedings
Book title: Proceedings of the Seventh International Conference on Concrete under Severe Conditions – Environment and Loading
Editor(s): Z.J. Li, W. Sun, C.W. Miao, K.Sakai, O.E. Gjørv, N.Banthia
ISBN: 978-2-35158-124-7
e-ISBN: 978-2-35158-134-6
Publisher: RILEM Publications SARL
Publication year: 2013
Pages: 628-640
Total Pages: 13
Language : English

Abstract: Different kind of fibres are used as reinforcement for cement based materials. They can increase the mechanical properties of the material and result in higher strength and/or strain capacity. This paper discusses various aspects of applying fibres at different scales. A lattice type model is first described which is used to investigate the behaviour. Depending on the fibre, matrix and bond properties the stress strain behaviour of the composite is studied for different volume percentages of fibres in the matrix. Multiple crack planes and ductile behaviour can be reached when the right combination of properties is chosen. This results of simulations with this tool can be of assistance when designing experiments on different levels and can form a link between the scales. For concrete steel fibres are popular to increase the strength and on the mortar scale polymer fibres are used to create strain hardening materials. In this research adding nano-tubes at the nano-scale and micro-fibres (rock wool fibres) at the micro-scale is studied experimentally to find out their potential in optimizing the mechanical properties. It is observed that the nano-tubes do increase the strength but no positive influence on the strain capacity was measured. The rock wool fibre reinforced cement paste both shows an increased strength but also a strain hardening behaviour.

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