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Characterization of Ultra High Performance Fiber Reinforced Concrete (UHPFRC) Tensile Behaviour
Ultra-high performance fiber reinforced concrete (UHPFRC) is considered a promising material for many applications where high compressive and tensile strength, small thickness and high energy absorption capacity are required. However, although these materials were introduced in the mid-1990s, a comprehensive investigation regarding its tensile characterization is still particularly challenging. Different tensile test setups have been used by many researchers, in order to obtain reliable results, but today there are currently no testing standards available that define test conditions, specimen geometry and analytical procedures to fully characterize the tensile properties of UHPFRC.
In this study, the tensile behaviour of UHPFRC has been investigated with direct tensile tests on dog-bone specimens, using a gripping system with rotating boundary conditions. Tests have been performed in displacement control. Digital Image Correlation (DIC) has been used to measure displacements, deformations, number and width of cracks in experimental testing.
The effect of hooked steel fibers with diameter of 0.38 mm and length of 30 mm on the tensile behaviour of UHPFRC has been investigated, varying the amount of fibers from 0% up to 2.6% by volume. The fiber volume fraction greatly influences the tensile strength of the material, strain at peak strength, energy absorption capacity and post-cracking behaviour.
Characterization of Ultra High Performance Fiber Reinforced Concrete (UHPFRC) Tensile Behaviour
Ultra-high performance fiber reinforced concrete (UHPFRC) is considered a promising material for many applications where high compressive and tensile strength, small thickness and high energy absorption capacity are required. However, although these materials were introduced in the mid-1990s, a comprehensive investigation regarding its tensile characterization is still particularly challenging. Different tensile test setups have been used by many researchers, in order to obtain reliable results, but today there are currently no testing standards available that define test conditions, specimen geometry and analytical procedures to fully characterize the tensile properties of UHPFRC.
In this study, the tensile behaviour of UHPFRC has been investigated with direct tensile tests on dog-bone specimens, using a gripping system with rotating boundary conditions. Tests have been performed in displacement control. Digital Image Correlation (DIC) has been used to measure displacements, deformations, number and width of cracks in experimental testing.
The effect of hooked steel fibers with diameter of 0.38 mm and length of 30 mm on the tensile behaviour of UHPFRC has been investigated, varying the amount of fibers from 0% up to 2.6% by volume. The fiber volume fraction greatly influences the tensile strength of the material, strain at peak strength, energy absorption capacity and post-cracking behaviour.
Characterization of Ultra High Performance Fiber Reinforced Concrete (UHPFRC) Tensile Behaviour
RILEM Bookseries
Serna, Pedro (Herausgeber:in) / Llano-Torre, Aitor (Herausgeber:in) / Martí-Vargas, José R. (Herausgeber:in) / Navarro-Gregori, Juan (Herausgeber:in) / Generosi, Nicola (Autor:in) / Donnini, Jacopo (Autor:in) / Corinaldesi, Valeria (Autor:in)
RILEM-fib International Symposium on Fibre Reinforced Concrete ; 2020 ; Valencia, Spain
Fibre Reinforced Concrete: Improvements and Innovations ; Kapitel: 94 ; 1068-1078
RILEM Bookseries ; 30
05.11.2020
11 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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