Direct tensile behavior of steel fiber reinforced ultra-high performance concrete at high strain rates using modified split Hopkinson tension bar

Hassan, Mostafa; Wille, Kay

doi:10.1016/j.compositesb.2022.110259

Cited by 15 publications

(6 citation statements)

References 36 publications

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“…This is due to the random distribution and orientation of the steel and plastic fibres [ 89 , 90 ], which increases the crack-tip stress fields and the extremely heterogeneous local tensile strength and fracture toughness, as in ordinary concrete where aggregates behave similarly to steel fibres [ 91 ]. This cannot be accurately represented by the homogeneous models used in this investigation and can only be simulated by models that directly or indirectly consider random heterogeneity [ 22 , 92 , 93 ]. According to the CDPM, two failure processes for flexural strength were observed in this study.…”

Section: Resultsmentioning

confidence: 99%

Modelling Fibre-Reinforced Concrete for Predicting Optimal Mechanical Properties

Khalel

Khan

2023

Materials

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Fibre-reinforced cementitious composites are highly effective for construction due to their enhanced mechanical properties. The selection of fibre material for this reinforcement is always challenging as it is mainly dominated by the properties required at the construction site. Materials like steel and plastic fibres have been rigorously used for their good mechanical properties. Academic researchers have comprehensively discussed the impact and challenges of fibre reinforcement to obtain optimal properties of resultant concrete. However, most of this research concludes its analysis without considering the collective influence of key fibre parameters such as its shape, type, length, and percentage. There is still a need for a model that can consider these key parameters as input, provide the properties of reinforced concrete as output, and facilitate the user to analyse the optimal fibre addition per the construction requirement. Thus, the current work proposes a Khan Khalel model that can predict the desirable compressive and flexural strengths for any given values of key fibre parameters. The accuracy of the numerical model in this study, the flexural strength of SFRC, had the lowest and most significant errors, and the MSE was between 0.121% and 0.926%. Statistical tools are used to develop and validate the model with numerical results. The proposed model is easy to use but predicts compressive and flexural strengths with errors under 6% and 15%, respectively. This error primarily represents the assumption made for the input of fibre material during model development. It is based on the material’s elastic modulus and hence neglects the plastic behaviour of the fibre. A possible modification in the model for considering the plastic behaviour of the fibre will be considered as future work.

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Section: Resultsmentioning

confidence: 99%

Modelling Fibre-Reinforced Concrete for Predicting Optimal Mechanical Properties

Khalel

Khan

2023

Materials

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“…In order to ensure the accuracy of SHPB test results and constant strain rate loading during the test process, a brass plate was used as a pulse shaper [53][54][55]. It was pasted at the center of the impact surface of the incident rod as a pulse shaper.…”

Section: Dynamic Compressive Testmentioning

confidence: 99%

Rubberized Concrete: Effect of the Rubber Size and Content on Static and Dynamic Behavior

Du,

Yang,

Cao

et al. 2024

Buildings

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Rubberized concrete (RC) has received widespread attention due to its energy absorption and crack resistance properties. However, due to its low compressive strength, it is not recommended for structural applications. The rubber size and content affect RC’s mechanical properties. This study investigated and formulated the behavior of RC with different particle sizes and contents under dynamic and static loading. Quasi-static compressive and dynamic tests were conducted on RC with varying content of rubber (0–30%) and rubber sizes (0.1–20 mm). It was found that the rubber particle size was 0.5mm and the rubber content was 2%. An equation was derived from the experimental data to forecast the impact of rubber size and content on compressive strength. Additionally, by combining the literature and this research’s data, a model was established based on neural networks to predict the strength of RC. SHPB tests were carried out to study the stress–strain curves under dynamic load. The peak stress, fragment analysis, and energy absorption of RC with varying content of rubber and rubber sizes at three different strain rates (100 s−1, 160 s−1, and 290 s−1) were investigated. Equations describing the relationship between dynamic increase factor (DIF), rubber material content, and strain rate on different particle sizes were obtained by fitting. The DIF increased as the content of the rubber increased. By analyzing energy absorption data, it was found that the optimal ratio for energy absorption was RC-0.5-30, RC-0.1-30, and RC-10-30 at strain rates of 100 s−1, 160 s−1, and 290 s−1. This study could be a good guideline for other researchers to easily select the content and size of the rubber in RC for their applications. It also has a positive significance in promoting the development of green building materials.

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“…Until now, many studies have explored the dynamic mechanical behaviour of UHPC especially dynamic compressive properties (e.g., [30][31][32][33]). It should be mentioned that concrete structures may fail more easily under dynamic tension [34,35] and therefore, a growing number of studies have been focused on the dynamic tensile behaviour of UHPC [36][37][38][39][40][41][42]. Most of them found that similar to normal concrete, the tensile properties of UHPC were significantly sensitive to the strain rate.…”

Section: Introductionmentioning

confidence: 99%

Effect of hybrid industrial and recycled steel fibres on static and dynamic mechanical properties of ultra-high performance concrete

Zhong

Chen

Zhang

2023

Construction and Building Materials

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Direct tensile behavior of steel fiber reinforced ultra-high performance concrete at high strain rates using modified split Hopkinson tension bar

Cited by 15 publications

References 36 publications

Modelling Fibre-Reinforced Concrete for Predicting Optimal Mechanical Properties

Modelling Fibre-Reinforced Concrete for Predicting Optimal Mechanical Properties

Rubberized Concrete: Effect of the Rubber Size and Content on Static and Dynamic Behavior

Effect of hybrid industrial and recycled steel fibres on static and dynamic mechanical properties of ultra-high performance concrete

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