A magnetic method for non destructive monitoring of fiber dispersion and orientation in steel fiber reinforced cementitious composites—part 1: method calibration

Ferrara, Liberato; Faifer, Marco; Toscani, Sergio

doi:10.1617/s11527-011-9793-y

Cited by 86 publications

(46 citation statements)

References 16 publications

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“…It is a nondestructive method, based on monitoring the specimen surface and detecting or measuring the variation of the inductance of a probe [20]. The main idea of the method is that the presence of steel fibres within a specimen can modify the flux linked by the winding of a probe resulting in the variation of impedance.…”

Section: A Magnetic Methodsmentioning

confidence: 99%

“…Many empirical measuring techniques enable us to determine the orientation of short steel fibres [17,20,21]. Though, the main limitation of these methods is that they may define only the tendencies such as a measured average orientation of fibres and some degree of alignment [20,21] instead of the attempt to evaluate the orientation of each fibre. In the earlier studies the casting of specimens is usually carried out under well defined and controlled laboratory conditions.…”

Section: Unknowns and Open Questions With Sfrcmentioning

confidence: 99%

“…These methods include photometric analysis [11,12,14,15,38,39], X-ray computed tomography [16,40,41,42] or they are based on different physical phenomena such as electrical conductivity and magnetism [20,21,43,44].…”

Section: Overview Of Measuring Techniquesmentioning

confidence: 99%

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DC-conductivity testing combined with photometry for measuring fibre orientations in SFRC

et al. 2013

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Dissertation for the Doctoral degree to be presented with due permissions of the School of Engineering, Aalto University and Tallinn University of Technology for public examination and debate in Auditorium R1 (Rakentajanaukio 4A) at the Aalto University (Espoo, Finland) on the 4th of April 2014 at 12 noon. Aalto University School of Engineering Tallinn University of TechnologyS up e r v i s i ng p r o f e s s o r P ro f e s s o r J ari P ut t o ne n, A al t o U ni v e rs i t y , F i nl and T h e s i s a d v i s o r D r. re r. nat . H e i k o H e rrmann, T al l i nn U ni v e rs i t y o f T e c h no l o g y , E s t o ni aP r e l i mi na r y e x a mi ne r s P ro f e s s o r H o l m A l t e nb ac h , F ac ul t y o f M e c h ani c al E ng i ne e ri ng , O t t ov o n G ue ri c k e -U ni v e rs i t ät M ag d e b urg , G e rmany P ro f e s s o r K e nne t h R une s s o n, D e p art me nt o f A p p l i e d M e c h ani c s , C h al me rs U ni v e rs i t y o f T e c h no l o g y , S w e d e n O p p o ne nt P ro f e s s o r K ari n L und g re n, D e p art me nt o f C i v i l and E nv i ro nme nt al E ng i ne e ri ng , C h al me rs U ni v e rs i t y o f T e c h no l o g y , S w e d e n A al t o U ni v e rs i t y p ub l i c at i o n s e ri e s D O C T O R A L D I S S E R T A T I O N S 2 8/ 2 0 1 4© M ari k a E i k I S BN 9 7 8-9 5 2 -6 0 -5 5 9 1 -6 I S BN 9 7 8-9 5 2 -6 0 -5 5 9 2 -3 ( p d f ) I S S N -L 1 7 9 9 -4 9 34 I S S N 1 7 9 9 -4 9 34 ( p ri nt e d ) I S S N 1 7 9 9 -4 9 4 2 ( p d f ) h t t p : / / urn. f i / U R N : I S BN : 9 7 8-9 5 2 -6 0 -5 5 9 2 -3 U ni g raf i a O y H e l s i nk i 2 0 1 4 F i nl and S up e r v i s i ng p r o f e s s o r P ro f e s s o r J ari P ut t o ne n, A al t o U ni v e rs i t y , F i nl andT h e s i s a d v i s o r D r. re r. nat . H e i k o H e rrmann, T al l i nn U ni v e rs i t y o f T e c h no l o g y , E s t o ni a P r e l i mi na r y e x a mi ne r s P ro f e s s o r H o l m A l t e nb ac h , F ac ul t y o f M e c h ani c al E ng i ne e ri ng , O t t ov o n G ue ri c k e -U ni v e rs i t ät M ag d e b urg , G e rmany P ro f e s s o r K e nne t h R une s s o n, D e p art me nt o f A p p l i e d M e c h ani c s , C h al me rs U ni v e rs i t y o f T e c h no l o g y , S w e d e n O p p o ne nt P ro f e s s o r K ari n L und g re n, D e p art me nt o f C i v i l and E nv i ro nme nt al E ng i ne e ri ng , C h al me rs U ni v e rs i t y o f T e c h no l o g y , S w e d e n A al t o U ni v e rs i t y p ub l i c at i o n s e ri e s D O C T O R A L D I S S E R T A T I O N S 2 8/ 2 0 1 4 © M ari k a E i k I S BN 9 7 8-9 5 2 -6 0 -5 5 9 1 -6 I S BN 9 7 8-9 5 2 -6 0 -5 5 9 2 -3 ( p d f ) I S S N -L 1 7 9 9 -4 9 34 I S S N 1 7 9 9 -4 9 34 ( p ri nt e d ) I S S N 1 7 9 9 -4 9 4 2 ( p d f ) h t t p : / / urn. f i / U R N : I S BN : 9 7 8-9 5 2 -6 0 -5 5 9 2 -3 U ni g raf i a O y H e l s i nk i 2 0 1 4 F i nl and S up e r v i s i ng p r o f e s s o r P ro f e s s o r J ari P ut t o ne n, A al t o U ni v e rs i t y , F i nl and © M ari k a E i k I S BN 9 7 8-9 5 2 -6 0 -5 5 9 1 -6 I S BN 9 7 8-...

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Section: A Magnetic Methodsmentioning

confidence: 99%

Section: Unknowns and Open Questions With Sfrcmentioning

confidence: 99%

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DC-conductivity testing combined with photometry for measuring fibre orientations in SFRC

et al. 2013

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“…From the slabs, once hardened, beam specimens 100 mm wide and 500 mm long were cut to be tested in 4-point bending, according to the schematic also shown in Figure 1. The beam specimens were cut from the slabs so that their axis, and hence the direction of the principal tensile stresses due to the bending action to be applied during the tests, was either parallel or perpendicular to the flow direction of the fresh concrete, along which the fibres are aligned [23,[25][26][27][28][29].…”

Section: Experimental Programmementioning

confidence: 99%

Effects of autogenous healing on the recovery of mechanical performance of High Performance Fibre Reinforced Cementitious Composites (HPFRCCs): Part 1

Ferrara

Krelani

Moretti

et al. 2017

Cement and Concrete Composites

Self Cite

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This paper presents the results are shown of a thorough characterization of the selfhealing capacity of High Performance Fibre Reinforced Cementitious Composites (HPFRCCs). The capacity of the material will be investigated to completely or partially re-seal the cracks, as a function of its composition, maximum crack width and exposure conditions. The analysis will also consider different flow-induced alignments of fibres, which can result into either strain-hardening or softening behaviour, whether the material is stressed parallel or perpendicularly to the fibres, respectively. Beam specimens, initially pre-cracked in 4-point bending up to different values of crack opening, were submitted to different exposure conditions, including water immersion, exposure to humid or dry air, and wet-and-dry cycles. After scheduled exposure times, ranging from one month to two years, specimens were tested up to failure according to the same test set-up employed for pre-cracking. Outcomes of the self-healing phenomenon, if any, were analyzed in terms of recovery of stiffness, strength and ductility. In a durability-based design framework, self-healing indices quantifying the recovery of mechanical properties were also defined and their significance crosschecked.

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“…This modification leads to a change in the inductance [14] measured with the LCR impedance analyser. The method takes advantage of the fact that steel fibres are several orders of magnitude more magnetic than plain concrete [15]. This means that the test is highly sensitive to the inclusion of even small amounts of steel fibres, whereas the concrete practically do not affect the measurements regardless of its strength class or composition.…”

Section: Introductionmentioning

confidence: 99%

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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A magnetic method for non destructive monitoring of fiber dispersion and orientation in steel fiber reinforced cementitious composites—part 1: method calibration

Cited by 86 publications

References 16 publications

DC-conductivity testing combined with photometry for measuring fibre orientations in SFRC

DC-conductivity testing combined with photometry for measuring fibre orientations in SFRC

Effects of autogenous healing on the recovery of mechanical performance of High Performance Fibre Reinforced Cementitious Composites (HPFRCCs): Part 1

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

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