On the orientation of fibres in structural members fabricated with self compacting fibre reinforced concrete

Zerbino, Raúl Luis; Tobes, Juan Manuel; Bossio, Maria Eugenia; Giaccio, Graciela Marta

doi:10.1016/j.cemconcomp.2011.09.005

Cited by 107 publications

(65 citation statements)

References 8 publications

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“…XCT imaging is a NDT method for obtaining a large number of consecutive sectional images of the internal structure of the specimens. It has been successfully used in several previous studies to characterize the mechanical properties of cement-based materials [22,26,41,44] while taking into consideration air-voids volume, spatial distribution of air and clogging.…”

Section: Introductionmentioning

confidence: 99%

Steel fibre spacing in self-compacting concrete precast walls by X-ray computed tomography

et al. 2014

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In the paper, a research programme focused on determination of steel fibre dispersion in self-compacting concrete using the X-ray computed tomography method is presented. Large scale specimens were cast (in the form of walls 1.2 m 9 1.2 m 9 0.15 m), containing different types of steel fibre. The tests were conducted on beam specimens cut from each wall. Both traditional destructive tests (compressive strength, three point bending) and non-destructive tests (X-ray computed tomography imaging followed by image analysis) were performed. The X-ray computed tomography method allowed to precisely determine fibre dispersion in the whole volume of the walls. These results were compared with mechanical properties of cut beams and their original location in the walls. Differences in fibre volume and dispersion between top and bottom parts of the walls were observed. The influence of the fibre type and the casting point location was also significant. Longer fibres became more effectively orientated in parallel to the bending loading direction, resulting in enhancement of the mechanical properties of the concrete. Tests on 16 beams (cut from each wall), through load-deflection relations, provided a thorough picture of mechanical uniformity of the material properties inside the walls. The X-ray computed tomography imaging proved to be intuitive and accurate in the assessment of steel fibre dispersion.

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Section: Introductionmentioning

confidence: 99%

Steel fibre spacing in self-compacting concrete precast walls by X-ray computed tomography

et al. 2014

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“…Many studies confirm that fibres are oriented in concrete due to and different factors [1,2,3], being the casting and compaction processes [4], the geometry and type of the fibres and the wall effect some of the more relevant; very fluid mixtures more susceptible and in self-compacting FRC it was proved the existence of significant flow effect [5,6,7,8,9]. The influence of these factors increases if thin elements are considered [10,11].…”

Section: Introductionmentioning

confidence: 90%

Vibrated and self-compacting fibre reinforced concrete: experimental investigation on the fibre orientation

Conforti

Plizzari

Zerbino

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. In addition to the fibre type and content, the residual properties of fibre reinforced concrete are influenced by fibre orientation. Consequently, the performance fibre reinforced concrete can be affected by its fresh properties (workability, flowing capacity) and by casting and compaction processes adopted. This paper focuses on the study of the orientation of steel or macro-synthetic fibres in two materials characterized by very different fresh properties: vibrated and self-compacting concrete. Four rectangular slabs 1800 mm long, 925 mm wide and 100 mm high were produced changing concrete and fibre type. From each slab, eighteen small prisms (550 mm long) were firstly cut either orthogonal or parallel to casting direction and, secondly, notched and tested in bending according to EN 14651. Experimental results showed that the toughness properties of a thin slab significantly varies both in vibrated and self-compacting concrete, even if in case of self-compacting concrete this variation resulted higher. Steel fibres led to greater variability of results compared to polymer one, underlining a different fibre orientation. A discussion on the relative residual capacity measured on the prisms sawn from the slabs and the parameters obtained from standard specimens is performed.

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“…Muchos trabajos han estudiado este tema demostrando que si bien las fibras se orientan en planos horizontales al igual que ocurre en HRF vibrado convencional, la velocidad de flujo y el efecto pared pueden dar lugar a grandes cambios en la orientación del refuerzo cuando se emplean hormigones autocompactantes [2][3][4]. Esto ocurre en especial cuando se fabrican elementos delgados [5]. Se ha encontrado que el punto de vertido puede afectar las propiedades residuales [6][7][8] y se observaron diferencias entre fibras de acero y macrofibras sintéticas, que pueden justificarse por cambios en la geometría y rigidez de las fibras [9][10].…”

Section: -Introducciónunclassified

Estudio comparativo de la orientación del refuerzo en losas de hormigón autocompactante reforzado con fibras poliméricas y de acero

Conforti

Plizzari

Zerbino

2018

Libro De Comunicaciones / Livro Das Comunicações

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Diversos trabajos han analizado los factores que modifican la orientación de las fibras cuando se incorporan al hormigón autocompactante, entre los que se destacan el efecto pared y la velocidad de flujo. Como consecuencia se puede producir una respuesta anisotrópica en los elementos estructurales que depende de la forma de vertido y de la geometría de los mismos. Este trabajo analiza la orientación de las fibras y sus efectos sobre las propiedades mecánicas en losas rectangulares de 1800 mm de largo, 925 mm de ancho y 100 mm de altura que fueron moldeadas con 4 hormigones autocompactantes que incorporan diferentes tipos de fibras de acero y macrofibras poliméricas, todos elaborados a partir de un mismo hormigón de base. De cada losa se aserraron 18 prismas de 550 mm de largo en direcciones normal y perpendicular a la dirección que luego se ensayaron de acuerdo a lo establecido en la norma EN 14651. Finalizados los mismos se realizó un conteo de la densidad de fibras en las superficies de fractura. Como referencia también se realizaron ensayos similares sobre prismas de 150 x 100 x 600 mm y ensayos de compresión sobre cubos. Los resultados obtenidos ponen en evidencia el efecto del tipo de fibra y el grado de variabilidad que puede ocurrir en este tipo de elementos estructurales.DOI:http://dx.doi.org/10.4995/HAC2018.2018.5496

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On the orientation of fibres in structural members fabricated with self compacting fibre reinforced concrete

Cited by 107 publications

References 8 publications

Steel fibre spacing in self-compacting concrete precast walls by X-ray computed tomography

Steel fibre spacing in self-compacting concrete precast walls by X-ray computed tomography

Vibrated and self-compacting fibre reinforced concrete: experimental investigation on the fibre orientation

Estudio comparativo de la orientación del refuerzo en losas de hormigón autocompactante reforzado con fibras poliméricas y de acero

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