Einfluss der Einbau‐ und der Betontechnologie auf die Faserverteilung und ‐orientierung in Wänden aus Stahlfaserbeton

Nehls, Norbert; Silbereisen, Rolf; Tue, Nguyen Viet

doi:10.1002/best.201000063

Cited by 6 publications

(2 citation statements)

References 2 publications

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“…In fact, fibers in this latter orientation can even act as discontinuities in the matrix and accelerate cracking. The fiber distribution and orientation strongly depends on the casting conditions of the fresh mix as well as geometric constraints, and the effect of casting-induced variations in fiber orientations on SFRC structural performance has been shown in previous research [8][9][10][11]. Some methods to control the fiber alignment in fresh concrete have also been proposed, e.g., by [12,13].…”

Section: Introductionmentioning

confidence: 99%

Non-Destructive Multi-Method Assessment of Steel Fiber Orientation in Concrete

et al. 2022

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Integration of fiber reinforcement in high-performance cementitious materials has become widely applied in many fields of construction. One of the most investigated advantages of steel fiber reinforced concrete (SFRC) is the deceleration of crack growth and hence its improved sustainability. Additional benefits are associated with its structural properties, as fibers can significantly increase the ductility and the tensile strength of concrete. In some applications it is even possible to entirely replace the conventional reinforcement, leading to significant logistical and environmental benefits. Fiber reinforcement can, however, have critical disadvantages and even hinder the performance of concrete, since it can induce an anisotropic material behavior of the mixture if the fibers are not appropriately oriented. For a safe use of SFRC in the future, reliable non-destructive testing (NDT) methods need to be identified to assess the fibers’ orientation in hardened concrete. In this study, ultrasonic material testing, electrical impedance testing, and X-ray computed tomography have been investigated for this purpose using specially produced samples with biased or random fiber orientations. We demonstrate the capabilities of each of these NDT techniques for fiber orientation measurements and draw conclusions based on these results about the most promising areas for future research and development.

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Section: Introductionmentioning

confidence: 99%

Non-Destructive Multi-Method Assessment of Steel Fiber Orientation in Concrete

et al. 2022

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“…2,4 Inversely, techniques aiming at predetermining the orientation of the fibers in the matrix have been studied. Some possibilities can be found with dependence on controlling the concreting process, for example, by pouring direction, 23 mix viscosity, 21 formwork configuration, 24 spraying, 25 and separate fiber dosing. 26 Specialized techniques and technologies include the attachment of steel fibers to flexible warps within the formwork, 27 application of magnetic fields 28 at the formwork circumference, manual 29 and mechanical layering of concrete, 30 but also robot-assisted localization of the fibers at pouring, 31 or in additive manufacturing.…”

Section: Introductionmentioning

confidence: 99%

Hybrid assessment of fiber orientation influence on the load resistance of anchors in SFRC

Mellios,

Losse,

Spyridis

2023

Civil Engineering Design

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The consistent evolution of concrete has led to a variety of concrete types that enhance the material's versatility, cost‐efficiency and sustainability. Despite the rapid development and extensive research regarding steel fibre reinforced concrete (SFRC) in the last decades, there are still knowledge gaps on the material's resistance against locally applied tension loads on anchor bolts, as well as the interaction of possible non‐homogenous fibre orientations on the anchorage axisymmetric stress field. This aspect becomes particularly relevant since anchors are placed at the component boundaries, where fibres tend to align parallel to the external surface. Through an innovative experimental investigation on 64 single bonded anchors using layer‐casting concrete and a supporting set of non‐linear finite element simulations, this work aspires to exhibit the influence of controlled unidimensional fibre orientation on the load‐bearing capacity and behaviour of anchorages in SFRC.This article is protected by copyright. All rights reserved.

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