Characterisation of the Tensile Behaviour of Uhpfrc by Means of Four-Point Bending Tests

Martínez, López; Ángel, Juan Edilberto Rendón

doi:10.4995/thesis/10251/79740

Cited by 11 publications

(16 citation statements)

References 45 publications

(129 reference statements)

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“…Furthermore, many researchers are engaging in developing various types of dog-bone shaped specimens to proof-test how specimen shape and gripping devices affect test results (Graybeal and Baby 2013; Reineck and Frettlor 2010; Denarié and Brühwiler 2015). It was observed that unnotched dog-bone shaped specimens with larger cross-sectional areas at the supports and a smooth geometry transition were helpful to avoid support failures and stress concentrations (Martínez 2017). Figure 2-8 depicts the dog-bone shaped specimen proposed in the Swiss standard (SIA2052 2014).…”

Section: Direct Tension Testmentioning

confidence: 99%

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Tensile behaviour of ultra-high-performance steel fiber reinforced concrete

et al. 2021

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Recent developments in the area of Ultra-High-Performance Steel Fiber Reinforced Concrete (UHP-SFRC) enables reduction in steel reinforcement, and has led to enhanced ductility and toughness of structural components owing to its resilient tensile behaviour. This paper presents the results of an experimental study conducted to investigate the tensile behaviour of UHP-SFRC. Four commercial mixes and two in-house mixes were evaluated using the procedures prescribed in the 2018 edition of Annex 8.1 of CSA-S6. Tensile strength of UHP-SFRC was quantified and correlated through the direct tension test, splitting test, inverse analysis of four-point bending test using either code expressions or nonlinear finite element analysis, and a calibrated empirical expression that links this property to the cylinder compressive strength. In addition, the effect of important parameters on flexural strength including casting methodology, volumetric ratio of steel fibers, and aspect ratio (shear span to depth ratio) of bending prisms have been assessed.

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Section: Direct Tension Testmentioning

confidence: 99%

“…12: Multiple micro-cracks of a UHPFRC specimen observed from a notched three-point bending test(Martínez 2017) …”

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confidence: 99%

Tensile behaviour of ultra-high-performance steel fiber reinforced concrete

et al. 2021

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“…In order to determinate the tensile strength of UHPFRC the stress-strain curves from the flexural tests have been taken as the starting point as seen in Figure 9. From the curve obtained, the key points [33] necessary to determine the tensile behaviour were determined, using the following points:…”

Section: Tensile Strengthmentioning

confidence: 99%

“…Point 3 is the point of the ascending zone of the curve, with 97% of the highest stress. Based on these points, the tensile strength of the UHPFRC can be obtained by the following equations [33]:…”

Section: Tensile Strengthmentioning

confidence: 99%

Use of Mining Waste to Produce Ultra-High-Performance Fibre-Reinforced Concrete

et al. 2020

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This research work analyses the influence of the use of by-products from a fluorite mine to replace the fine fraction of natural aggregates, on the properties of Ultra-High-Performance Fibre-Reinforced Concrete (UHPFRC). Replacing natural aggregates for different kinds of wastes is becoming common in concrete manufacturing and there are a number of studies into the use of waste from the construction sector in UHPFRC. However, there is very little work concerning the use of waste from the mining industry. Furthermore, most of the existing studies focus on granite wastes. So, using mining sand waste is an innovative alternative to replace natural aggregates in the manufacture of UHPFRC. The substitutions in this study are of 50%, 70% and 100% by volume of 0–0.5 mm natural silica sand. The results obtained show that the variations in the properties of consistency, compressive strength, modulus of elasticity and tensile strength, among others, are acceptable for substitutions of up to 70%. Therefore, fluorite mining sand waste is proved to be a viable alternative in the manufacturing of UHPFRC.

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“…Four-point bending tests were performed on prisms of size 100 × 100 × 500 mm 3 , with the loading points at beam length thirds, and the deflection at mid-span being measured by two displacement transducers on the front and back sides. The tensile response was obtained from the load vs deflection curves while using the simplified inverse analysis method that was proposed in [21,22]. This tensile constitutive model is defined by the parameters: elastic modulus (E), cracking strength (f t ), ultimate cracking strength (f tu ), and its associated strain (ε tu ).…”

Section: Flexural-tensile Strength Of Uhfprcsmentioning

confidence: 99%

Influence of Cracking on Oxygen Transport in UHPFRC Using Stainless Steel Sensors

et al. 2019

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Reinforced concrete elements frequently suffer small cracks that are not relevant from the mechanical point of view, but they can be an entrance point for aggressive agents, such as oxygen, which could initiate the degradation processes. Fiber-Reinforced Concrete and especially Ultra High Performance Concrete increase the multi-cracking behavior, reducing the crack width and spacing. In this work, the oxygen availability of three types of concrete was compared at similar strain levels to evaluate the benefit of multi-cracking in the transport of oxygen. The types of concrete studied include traditional, High-Performance, and Ultra-High-Performance Fiber-Reinforced Concrete with and without nanofibers. To this purpose, reinforced concrete beams sized 150 × 100 × 750 mm 3 were prepared with embedded stainless steel sensors that were located at three heights, which have also been validated through this work. These beams were pre-cracked in bending up to fixed strain levels.The results indicate that the sensors used were able to detect oxygen availability due to the presence of cracks and the detected differences between the studied concretes. Ultra High Performance Concrete in the cracked state displayed lower oxygen availability than the uncracked High Performance Concrete, demonstrating its potential higher durability, even when working in cracked state, thanks to the increased multi-cracking response. Author Contributions: Conceptualization, P.S. and M.V.; methodology, P.S., A.M.-I.; formal analysis, A.M.-I. and M.R.-F.; investigation, A.M.-I., E.J.M.-A. and J.L.-F.; resources, P.S. and M.V.; writing-review and editing, M.R.-F. and A.M.-I.; supervision, P.S. and M.V.; project administration, M.R.-F.; funding acquisition, A.M.-I., M.V., P.S. and M.R.-F. All authors have read and agreed to the published version of the manuscript.

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Characterisation of the Tensile Behaviour of Uhpfrc by Means of Four-Point Bending Tests

Cited by 11 publications

References 45 publications

Tensile behaviour of ultra-high-performance steel fiber reinforced concrete

Tensile behaviour of ultra-high-performance steel fiber reinforced concrete

Use of Mining Waste to Produce Ultra-High-Performance Fibre-Reinforced Concrete

Influence of Cracking on Oxygen Transport in UHPFRC Using Stainless Steel Sensors

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