Inductive method for assessing the amount and orientation of steel fibers in concrete

Torrents, J.M.; Blanco, Ana; Pujadas, Pablo; Aguado, Antonio; Juan-García, Pablo; Sánchez-Moragues, Miguel Ángel

doi:10.1617/s11527-012-9858-6

Cited by 109 publications

(69 citation statements)

References 20 publications

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“…Such electromagnetic methods can be used either for laboratory specimens or small elements (Torrents et al, 2012) or for real size structures The fiber distribution in precast elements, in an industrial setting, was studied using drilled cores from the FRC, with the fiber orientation determined using X-ray analysis and the fiber content determined by crushing the cores. Using this technique, Kooiman (2000) studied the fiber orientation and distribution in precast tunnel lining segments reinforced with 60 kg/m 3 of steel fibers and concluded that the fibers were not randomly oriented spatially and that bleeding was observed during vibration of the segment, which causes differences in the concrete quality over the thickness of segment, resulting in variations in the FRC properties.…”

Section: Fiber Distribution In the Frcmentioning

confidence: 99%

Distribution of fibers in SFRC segments for tunnel linings

Carmona

Molins

Aguado

et al. 2016

Tunnelling and Underground Space Technology

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This paper presents research results regarding the distribution of steel fibers in concrete used to build precast tunnel segments for Line 9 of the Barcelona Metro. The fiber distribution was studied using the actual fiber contents obtained by means of crushed cores drilled from different points of three full-scale tunnel lining segments. A statistical analysis determined that the fiber content in the ends of segments tend to be greater than in the central zone. In addition, cores with a diameter of 150 mm were found to have a lower scatter in the fiber content than smaller diameter specimens. Finally, based on probabilistic approaches, a minimum of 11 cores is proposed to control the fiber content in FRC segments.

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Section: Fiber Distribution In the Frcmentioning

confidence: 99%

Distribution of fibers in SFRC segments for tunnel linings

Carmona

Molins

Aguado

et al. 2016

Tunnelling and Underground Space Technology

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“…The equipment proposed by Torrents et al [1] is composed by a discontinuous square coil manufactured with a copper cable of 0.2 mm of diameter and a length of 1600 mm, resulting in a total of 2354 turns. The dimensions of the prismatic plastic element around which the coil is placed are 15 x 17 x 17 cm (see Figure 1.a).…”

Section: Figure 2 Fibres Inside a Non-homogeneous Magnetic Flux (A) mentioning

confidence: 99%

“…The increasing use of steel fibre reinforced concrete (SFRC) [1][2][3][4] has generated the need for tests that provide information about the material. Besides the traditional tests to assess mechanical properties [5][6][7], different techniques are required to evaluate the fibre content and orientation.…”

Section: Introductionmentioning

confidence: 99%

“…An example is the inductive method proposed by Torrents et al [1] and improved by Cavalaro et al [2]. As shown in Figure 1.a, the equipment used in this test is composed by a LCR impedance analyser and a coil that receives an electric current and generates a magnetic field.…”

Section: Introductionmentioning

confidence: 99%

“…

AbstractThe inductive method proposed by Torrents et al [1] and improved by Cavalaro et al [2] is used to assess the fibre content and distribution in steel fibre reinforced concrete, providing valuable information for the design and the quality control. Despite several advantages, the method presents limitations.

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confidence: 99%

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Assessment of fibre content and 3D profile in cylindrical SFRC specimens

et al. 2015

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The inductive method proposed by Torrents et al. [1] and improved by Cavalaro et al. [2] is used to assess the fibre content and distribution in steel fibre reinforced concrete, providing valuable information for the design and the quality control. Despite several advantages, the method presents limitations. On one hand, it was conceived for the test of cubic specimens, which complicates its application in existing structures due to the difficulty to extract cubic cores. On the other hand, only a partial characterization of the fibre orientation is obtained given that the determination is restricted to the three axes of the specimen. With these measurements, it is not possible to derive the fibre orientation in other directions different from the ones used to test the sample. The objective of this paper is to propose an assessment of the fibre content and distribution in any direction using the inductive method and cylindrical specimens. For that, first a modification of the method is proposed. Then, new equations are deducted to generalize the test to samples with different shapes and to assess the anisotropy level as well as the directions with the maximum and the minimum fibre contribution. Next, an extensive experimental program and FEM numerical simulations are performed to validate and to determine the accuracy of the formulation developed. The results show that the application of these equations and the execution of only one additional measurement per specimen are enough to determine the fibre profile in all in-plane directions with a high accuracy.

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