Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Flexural Fatigue Deterioration Behaviour of Pre-cracked Fibre Reinforced Concrete
Fibres have long been added to concrete to enhance its post-cracking ductility, toughness, and to control the propagation of cracks in fibre reinforced concrete. The random dispersion of fibres in the composite improves crack control since the location and growth directions of the cracks are random, and the fibres are dispersed throughout the concrete matrix. Applications of FRC include pavements, bridge decks, and tunnels, among others, all of which may be subjected to various types of loading throughout their service lives. These loadings may occur as static or fatigue loadings. The fatigue behaviour of FRC has been explored by several researchers to understand the response of FRC to fatigue loading. However, the focus has been on the uncracked state, which does not assess the post-cracking capability of the composite, which ultimately determines the remaining service life of the structure. This research investigates the fatigue behaviour of pre-cracked steel and polypropylene FRC at various fibre dosages. Two hooked-end steel fibres were investigated, namely Dramix 3D-65/60-BG and 5D-65/60/-BG. The polypropylene fibre used was Masterfiber 240. The results show that the fibre type is the leading cause of premature failure. Stiffer fibres such as steel fibres are able to provide improved post-cracking ductility compared to polypropylene. Furthermore, to enhance the post-cracking ductility, more fibres are needed to bridge the crack, and consequently, an increase in fibre dosage resulted in improved fatigue behaviour.
Flexural Fatigue Deterioration Behaviour of Pre-cracked Fibre Reinforced Concrete
Fibres have long been added to concrete to enhance its post-cracking ductility, toughness, and to control the propagation of cracks in fibre reinforced concrete. The random dispersion of fibres in the composite improves crack control since the location and growth directions of the cracks are random, and the fibres are dispersed throughout the concrete matrix. Applications of FRC include pavements, bridge decks, and tunnels, among others, all of which may be subjected to various types of loading throughout their service lives. These loadings may occur as static or fatigue loadings. The fatigue behaviour of FRC has been explored by several researchers to understand the response of FRC to fatigue loading. However, the focus has been on the uncracked state, which does not assess the post-cracking capability of the composite, which ultimately determines the remaining service life of the structure. This research investigates the fatigue behaviour of pre-cracked steel and polypropylene FRC at various fibre dosages. Two hooked-end steel fibres were investigated, namely Dramix 3D-65/60-BG and 5D-65/60/-BG. The polypropylene fibre used was Masterfiber 240. The results show that the fibre type is the leading cause of premature failure. Stiffer fibres such as steel fibres are able to provide improved post-cracking ductility compared to polypropylene. Furthermore, to enhance the post-cracking ductility, more fibres are needed to bridge the crack, and consequently, an increase in fibre dosage resulted in improved fatigue behaviour.
Flexural Fatigue Deterioration Behaviour of Pre-cracked Fibre Reinforced Concrete
RILEM Bookseries
Beushausen, Hans (Herausgeber:in) / Ndawula, Joanitta (Herausgeber:in) / Alexander, Mark (Herausgeber:in) / Dehn, Frank (Herausgeber:in) / Moyo, Pilate (Herausgeber:in) / Fataar, Humaira (Autor:in) / Makara, Nyane Patricia (Autor:in) / Combrinck, Riaan (Autor:in)
International Conference on Concrete Repair, Rehabilitation and Retrofitting ; 2024 ; Cape Town, South Africa
01.11.2024
10 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Time-dependent flexural behaviour of cracked steel fibre reinforced self-compacting concrete panels
| Online Contents | 2015