Improved Tensile Performance with Fiber Reinforced Self-compacting Concrete

Grünewald, S.; Laranjeira, F.; Walraven, J.C.; Aguado, Antonio; Molins, Climent

doi:10.1007/978-94-007-2436-5_7

Cited by 12 publications

(10 citation statements)

References 6 publications

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“…While in the latter steel rebars tend to be efficiently placed in the section with regard to the cracking plane, in SFRC the orientation of the fibres may not be as efficient. This has a direct effect on the postcracking tensile response, either enhancing or penalising it [1].…”

Section: Introductionmentioning

confidence: 99%

Assessment of the fibre orientation factor in SFRC slabs

Blanco

Pujadas

Fuente

et al. 2015

Composites Part B: Engineering

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a b s t r a c tThe design of steel fibre reinforced concrete (SFRC) structures is evolving towards a new approach that uses correction factors to consider differences between the small-scale characterisation specimens and the real-scale elements. Recently, the Model Code 2010 proposed an orientation factor (K) that accounts for the effects of the orientation in the structural response of elements. The present study focuses on the identification of this factor in SFRC slabs with different dimensions. For that, flexural tests on real-scale slabs were conducted and the fibre orientation was assessed with an inductive method. A finite element analysis showed the differences between the experimental curves and the prediction of the Model Code without considering K. Based on the results obtained, a range of values is proposed for K and validated. This study sheds light on possible modifications that this philosophy of design might require to better reproduce the behaviour of slabs.

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Section: Introductionmentioning

confidence: 99%

Assessment of the fibre orientation factor in SFRC slabs

Blanco

Pujadas

Fuente

et al. 2015

Composites Part B: Engineering

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“…The structural concrete Standards [8,12] adopt residual strength values supplied by bending tests, f R1 and f R3 , as structural designing values of fiber reinforced concrete. Equation (2) shows the relation between the force applied by the test machine and the residual strength of the material in the bending test [23].…”

Section: Comparison Of Bending and Tensile Testmentioning

confidence: 99%

“…Fiber-reinforced concrete (FRC), with fibers randomly distributed in the mass, improves plain concrete tensile strength, increases its ductility and reduces cracking at early ages [1,2]. This aspect improves durability and reduces the maintenance costs.…”

Section: Introductionmentioning

confidence: 99%

New Methodological Approach towards a Complete Characterization of Structural Fiber Reinforced Concrete by Means of Mechanical Testing Procedures

et al. 2020

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This work proposes a novel methodology for the complete characterization of fiber reinforced concrete (FRC). The method includes bending tests of prismatic notched specimens, based on the Standards for FRC, tensile and pure shear tests. The values adopted by the standards for designing FRC are the obtained from bending tests, typically fR3, even for shear and pure tension loading. This paper shows that the remaining strength of FRC, supplied by the fibers, depends on the type of loading. In the case of shear and tensile loading the prescriptions of the standards may be unsafe. In this work, the remaining halves of specimens subjected to bending test are prepared and used for shear and tension tests. This means significant savings in specimen preparation and a greater amount of information for structural use of FRC. The results provide relevant information for the design of structural elements of FRC compared with the only use of data supplied by bending tests. In the case of tensile tests, fLOP values are 42% of the strength of the equivalent bending results, being 31% the average reduction in remaining resistance in comparison with the bending test. Pure shear tests showed, for 0.5 mm shear displacement, that the shear resistance is greater than 160% of that expressed according to bending tests. In addition, a video-extensometry system was used to analyze the crack generation and cracking patterns. The video-extensometry applied to shear tests allowed the assessment of the sliding values and crack opening values at the crack discontinuity. These values may be quite relevant for the study of the FRC behavior when subjected to shear according to the shear-friction model theories.

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“…The structural concrete Standards [8, 12] adopt residual strength values supplied by bending tests, fR1 and fR3, as structural designing values of fiber reinforced concrete. Equation (2) show the relation between the force applied by the test machine and the residual strength of the material in the bending test [23].…”

Section: Comparison Of Bending and Tensile Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

New Methodological Approach Towards a Complete Characterization of Structural Fiber Reinforced Concrete by Means of Mechanical Testing Procedures

Alberti¹,

Iranzo²,

Gálvez³

et al. 2020

Preprint

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This work proposes a novel methodology for the complete characterization of fiber reinforced concrete (FRC). The method includes bending tests of prismatic notched specimens, based on the Standards for FRC, tensile and pure shear tests. The values adopted by the standards for designing FRC are the obtained from bending tests, typically fR3, even for shear and pure tension loading. This paper shows that the remaining strength of FRC, supplied by the fibers, depends on the type of loading. In the case of shear and tensile loading the prescriptions of the standards may be unsafe. In this work, the remaining halves of specimens subjected to bending test are prepared and used for shear and tension tests. This means significant savings in specimen preparation and a greater amount of information for structural use of FRC. The results provide relevant information for the design of structural elements of FRC compared with the only use of data supplied by bending tests. In addition, a video-extensometry system was used to analyze the crack generation and cracking patterns. The video-extensometry applied to shear tests allowed the assessment of the sliding values and crack opening values at the crack discontinuity. These values may be quite relevant for the study of the FRC behavior when subjected to shear according to the shear-friction model theories.

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Improved Tensile Performance with Fiber Reinforced Self-compacting Concrete

Cited by 12 publications

References 6 publications

Assessment of the fibre orientation factor in SFRC slabs

Assessment of the fibre orientation factor in SFRC slabs

New Methodological Approach towards a Complete Characterization of Structural Fiber Reinforced Concrete by Means of Mechanical Testing Procedures

New Methodological Approach Towards a Complete Characterization of Structural Fiber Reinforced Concrete by Means of Mechanical Testing Procedures

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