Fibre Distribution Characterization of Ultra-High Performance Fibre-Reinforced Concrete (UHPFRC) Plates Using Magnetic Probes

Li, Lufan; Xia, Jun; Chin, Chee Seong; Jones, Steve

doi:10.3390/ma13225064

Cited by 9 publications

(7 citation statements)

References 26 publications

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“…The structural model of the opening of the macro-cracks in the prisms was developed using the previous modelling experience [45,46] and the results of testing of the micromechanics of the fiber pulling obtained in this study. The mechanical behavior of SFRC depends on the amount, orientation and the spatial distribution of the fibers, and geometry of the particular fiber, as well as design of the concrete matrix mix and the way concrete mix is placed into the formwork [47][48][49][50][51][52]. Fiber concentrations in the specimens and every particular layer of the specimen are given in Table 3.…”

Section: Numerical Modelling Of Sfrc Cracking Processmentioning

confidence: 99%

Experimental Investigation and Modelling of the Layered Concrete with Different Concentration of Short Fibers in the Layers

Lūsis

Kononova

Mačanovskis

et al. 2021

Fibers

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The use of steel fiber reinforced concrete (SFRC) in structures with high physical-mechanical characteristics allows engineers to reduce the weight and costs of the structures, to simplify the technology of their production, to reduce or completely eliminate the manual labor needed for reinforcement, at the same time increasing reliability and durability. Commonly accepted technology is exploiting randomly distributed in the concrete volume fibers with random each fiber orientation. In structural members subjected to bending, major loads are bearing fibers located close to outer member surfaces. The majority of fibers are slightly loaded. The aim of the present research is to create an SFRC construction with non-homogeneously distributed fibers. We prepared layered SFRC prismatic specimens. Each layer had different amount of short fibers. Specimens were tested by four point bending till the rupture. Material fracture process was modelled based on the single fiber pull-out test results. Modelling results were compared with the experimental curves for beams. Predictions generated by the model were validated by 4PBT of 100 × 100 × 400 mm prisms. Investigation had shown higher load-bearing capacity of layered concrete plates comparing with plate having homogeneously distributed the same amount of fibers. This mechanism is strongly dependent on fiber concentration. A high amount of fibers is leading to new failure mechanisms—pull-out of FRC blocks and decrease of load-bearing capacity. Fracture surface analysis was realized for broken prisms with the goal to analyze fracture process and to improve accuracy of the elaborated model. The general conclusion with regard to modelling results is that the agreement with experimental data is good, numeric modelling results successfully align with the experimental data. Modelling has indicated the existence of additional failure processes besides simple fiber pull-out, which could be expected when fiber concentration exceeds the critical value.

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Section: Numerical Modelling Of Sfrc Cracking Processmentioning

confidence: 99%

Experimental Investigation and Modelling of the Layered Concrete with Different Concentration of Short Fibers in the Layers

Lūsis

Kononova

Mačanovskis

et al. 2021

Fibers

View full text Add to dashboard Cite

show abstract

“…These problems show the need for a test setup that is easy to apply, ideally nondestructive and can be used for rehabilitation processes to determine the fibre parameters, for example (see, e.g., ([16-19]). Possible methods that were used in different studies are based on computer tomography (CT), microscopic analysis of sectional images or inductivity measurements (see, e.g., [10,17,18,[20][21][22][23][24][25][26]). The main problems with CT analysis are its high cost and the limited size of specimens.…”

Section: Introductionmentioning

confidence: 99%

A New Method to Determine the Steel Fibre Content of Existing Structures—Test Setup and Numerical Simulation

2022

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The diagnostics of constructions built with steel fibre reinforced concrete are extremely difficult to conduct because, typically, no information on the actual amount and orientation of the fibres is available. Therefore, it is of great interest to engineers to have the possibility to determine the steel fibre content and, at best, also the orientation of the fibres in existing structures. For this purpose, an easy-to-use test setup was developed and tested, in the course of laboratory investigations. This method can be used for cylinders, for example drilling cores, that can later be taken of existing structures, to determine both the fibre content and orientation. Based on these results, a model for cylindrical specimens was derived, which can be used for varying concrete compositions with steel fibre contents of up to 80 kg/m3. In the case of missing information concerning the concrete composition, it allows an initial estimation for the fibre content. In case additional information about the concrete composition is available, a much higher accuracy of the projected steel fibre content and therefore, an assessment of the building’s condition is possible.

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“…Electrical resistivity measurements are one possible non-destructive test method for this analysis. This approach is beneficial since it is easier to apply and less costly compared to other methods such as CT-scanning, cross-sectional analysis via microscope or inductive techniques (see [12,[18][19][20][21][22][23][24][25][26][27][28][29]). With the help of an optimised experimental setup, this study focuses on the validation of electrical resistivity as a novel approach to assess the fibre content and orientation of drilling cores extracted from concrete plates with fibre contents up to 80 kg/m 3 .…”

Section: Introductionmentioning

confidence: 99%

A New Method to Determine the Steel Fibre Content of Existing Structures—Evaluation and Validation

2022

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The in-situ measurement of the content and orientation of steel fibres in concrete structures is of great importance for the assessment of their specific mechanical properties, especially in the case of repair. For existing structures, the actual fibre content as well as the orientation of the fibres, which is based on many factors such as casting or compacting direction, is typically unknown. For structural maintenance or rehabilitation, those factors have to be determined in order to apply meaningful structural design calculations and plan necessary strengthening methods. For this reason, a new method based on the analysis of drilling cores of concrete structures has been established. The newly developed non-destructive test setup used in this research consists of a framework for cylindrical specimens in combination with an LCR meter to determine the electrical resistance of the fibre reinforced concrete. In combination with a suitable FEM model, concretes with fibre contents up 80 kg/m3 were analysed to derive a first model to assess the actual fibre content of steel fibre reinforced concretes. After a calibration of the literature’s equation by use of an adjusted aspect ratio for the analysis of drilling cores, the estimation of the fibre content is possible with high accuracy for the tested material combination. The results show that the newly developed test method is suitable for the rapid and non-destructive structural diagnosis of the fibre content of steel fibre reinforced concrete based on drilling cores using electrical resistivity measurements.

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Fibre Distribution Characterization of Ultra-High Performance Fibre-Reinforced Concrete (UHPFRC) Plates Using Magnetic Probes

Cited by 9 publications

References 26 publications

Experimental Investigation and Modelling of the Layered Concrete with Different Concentration of Short Fibers in the Layers

Experimental Investigation and Modelling of the Layered Concrete with Different Concentration of Short Fibers in the Layers

A New Method to Determine the Steel Fibre Content of Existing Structures—Test Setup and Numerical Simulation

A New Method to Determine the Steel Fibre Content of Existing Structures—Evaluation and Validation

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