What is it about?
This study investigates how combining different types of synthetic fibres affects the ductility of concrete. Micro fibres are typically used to control early micro-cracking, while macro fibres improve the load-carrying capacity and toughness of hardened concrete. The research examines whether combining these fibres creates additional benefits compared with using each type separately. Beam bending tests and a new mechanical model are used to analyse the behaviour of concrete reinforced with micro fibres, macro fibres, and their combination. The study shows that micro fibres can improve the anchorage of macro fibres in the concrete matrix, which can lead to improved fracture toughness and more ductile structural behaviour.
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Why is it important?
Different fibre types improve different properties of concrete. Micro fibres help control early micro-cracking, while macro fibres improve the ductility and load-bearing capacity of the structure after cracking. Understanding how these fibres interact when used together can help engineers combine their advantages more effectively. Mixed fibre reinforcement can also be more economical, since micro fibres are typically cheaper than macro fibres. By improving the anchorage and efficiency of macro fibres, micro fibres can increase toughness without simply increasing the amount of expensive reinforcement. This makes it possible to achieve better structural performance in a more cost-efficient way.
Perspectives
The results highlight the potential of hybrid fibre reinforcement, where different fibre types are used together to optimize the mechanical behaviour of concrete. Future research can further investigate the optimal ratios of micro and macro fibres and how their interaction influences structural performance. Improved modelling approaches that consider real fibre distribution and fibre interaction could also help translate these findings into practical design methods. This would support the wider use of mixed-fibre reinforced concrete in engineering applications, enabling more efficient and economical structural solutions.
Dr Karoly Peter Juhasz
JKP Static Ltd
Read the Original
This page is a summary of: Effect of Mixed Fibers on the Ductility of Concrete, Journal of Materials in Civil Engineering, September 2017, American Society of Civil Engineers (ASCE),
DOI: 10.1061/(asce)mt.1943-5533.0001927.
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