Comparisons Between Pull-Out Behaviour of Various Hooked-End Fibres in Normal–High Strength Concretes

Abdallah, Sadoon; Rees, D. Andrew S.

doi:10.1186/s40069-019-0337-0

Cited by 20 publications

(6 citation statements)

References 32 publications

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“…These results demonstrate that the pull-out response of the hooked fibers at the given embedded length is predominantly influenced by the mobilization and straightening of the hooks; the fibers are also pulled with friction, which is in accordance with the findings by published other authors. [36][37][38].…”

Section: Fibers Pull-out Process Experimental Resultsmentioning

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: Fibers Pull-out Process Experimental Resultsmentioning

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

“…The chemical bonding can be described as intermolecular forces such as Van‐der‐Waals‐bonds or hydrogen‐bonds and occur mainly in the elastic state of SFPT. Mechanical anchoring can be divided into two major factors, undercut formations on the fiber surface reaching into solidified concrete and friction between fiber and concrete surface during pull out 21,22,27–29 …”

Section: Introductionmentioning

confidence: 99%

Investigation on pull‐out behavior and interface critical parameters of polymer fibers embedded in concrete and their correlation with particular fiber properties

Sigrüner

Muscat

Strübbe

2021

J of Applied Polymer Sci

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A crucial problem in concrete engineering is the corrosion of steel reinforcements. Polymer fibers as alternative reinforcement material can prevent corrosion; however, high adhesion to concrete and good fiber mechanics are necessary for polymers to be considered as an alternative reinforcement. This study tested different thermoplastic polymer materials to evaluate their level of adhesion to concrete. The adhesion properties of different self‐drawn polymer fibers were analyzed by extracting the fibers from concrete using single fiber pull‐out test (SFPT). To determine the adhesion mechanism, different polymer properties were analyzed and correlated to SFPT. Strong evidence was found that the fibers mechanical properties correlate with SFPT. Roughening the fiber surface increases the SFPT results significantly. While highly polar materials can support the adhesion process, a clear correlation could not be found. This study identifies high stiffness and roughness as the crucial properties of polymer fibers used in concrete engineering. If these factors can be engineered into the fiber, polymer fibers can present an alternative to steel in concrete reinforcement.

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“…The single fiber pull-out test (SFPT) is a common method to characterize the fibermatrix adhesion and will be used in this study to analyze polymeric fibers for concrete reinforcement. 27,[33][34][35] Gao 36 and Hsueh 37,38 developed mathematical methods to describe the fiber-matrix debonding.…”

Section: Introductionmentioning

confidence: 99%

Pull‐out behavior of polymer fibers in concrete

Sigrüner,

Hüsken,

Pirskawetz

et al. 2023

Journal of Polymer Science

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The bond between polymer fibers and the surrounding cementitious matrix is essential for the development of concrete reinforcement. The single fiber pull‐out test (SFPT) is the standard characterization technique for testing the bond strength. However, the different phases of debonding cannot be distinguished by the SFPT. This study investigates the debonding of different polymer fibers from the surrounding cementitious matrix with a modified SFPT and proposes methods to change the SFPT setup to generate more valuable information on the debonding mechanism. The SFPT was equipped with linear variable differential transformers (LVDT), digital image correlation (DIC) and acoustic emission (AE) analysis. The results demonstrate that the modified SFPT allows a better understanding of the different phases of debonding during fiber pull‐out. Furthermore, bond strength values calculated by different methods reveal that the chemical bond of the investigated polymers is not different as reported by previous studies. Deformation measurements performed using LVDTs and DIC are suitable measuring techniques to characterize the debonding mechanism in SFPT. A correlation between recorded AE and debonding phases was not found.

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Comparisons Between Pull-Out Behaviour of Various Hooked-End Fibres in Normal–High Strength Concretes

Cited by 20 publications

References 32 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

Investigation on pull‐out behavior and interface critical parameters of polymer fibers embedded in concrete and their correlation with particular fiber properties

Pull‐out behavior of polymer fibers in concrete

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