Influence of the properties of polypropylene fibres on the fracture behaviour of low-, normal- and high-strength FRC

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• 作者：Hé ; ctor Cifuentes^a ; ^bulte@us.es ; Fidel Garc&iacute ; a^b ; Orlando Maeso^b ; Fernando Medina^a
• 关键词：Fibre reinforced concrete ; Polypropylene fibres ; Boundary effect method ; Fracture behaviour
• 刊名：Construction and Building Materials
• 出版年：2013
• 出版时间：August, 2013
• 年：2013
• 卷：45
• 期：Complete
• 页码：130-137
• 全文大小：668 K

文摘

This paper describes a comprehensive experimental study of the influence of the geometrical and mechanical properties of polypropylene fibres on the fracture parameters and ductility of low, normal, and high-strength fibre-reinforced concrete. Three-point bending tests were carried out on 88 notched beams using the simplified boundary effect method of Abdalla and Karihaloo. The influence of the fibre reinforcement was especially felt on the tail of the load-displacement curve, and its effect on the size-independent specific fracture energy of concrete has been subsequently analysed. An analysis of the ductility of the concrete has also been carried out based on the Hillerborg¡¯s brittleness number. The increase in ductility due to the influence of the fibre reinforcement was conveniently analysed for the different mixes. From results, an analysis of the likeliest mechanisms of failure of the fibres reliant on their properties and the strength of concrete was completed. The results showed the most suitable fibres that were used to get the best fracture behaviour for a particular strength of concrete.