Strain Rate Dependent Behavior and Modeling for Compression Response of Hybrid Fiber Reinforced Concrete

Ibrahim, Sobhy M.; Almusallam, Tarek; Al-Salloum, Yousef; Abadel, Aref A.; Abbas, Husain

doi:10.1590/1679-78252717

Cited by 22 publications

(9 citation statements)

References 48 publications

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“…The maximum DIF for toughness presented in Table 6 is 2.54. Figure 19 shows the DIF values associated to toughness for the loading rates tested within the present research, and compares these with the results obtained with the model proposed by Ibrahim et al [38]. This model underestimates the experimental results obtained in the present study.…”

Section: Energy Absorption Capacity (Toughness)supporting

confidence: 73%

Experimental and analytical study of the high-strain-rate compressive behavior of SFRC

Bakhshi

Valente

Ramezansefat

et al. 2023

Mechanics of Advanced Materials and Structures

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The compressive behavior of steel-fiber-reinforced-concrete (SFRC) is dependent on the loading rate. This research investigates, experimentally and analytically, the effect of loading rate on the compressive behavior of SFRC designed to be used in prefabricated urban protective furniture. For this purpose, cylinder SFRC specimens were subjected to modified instrumented-drop-weightimpact tests at four dropping heights and quasi-static tests with four different strain rates. The inertia force was analytically obtained and also experimentally measured. The results demonstrate that by increasing the strain rate, elastic modulus, compressive strength, and energy dissipation capacity have increased. Three different models were proposed for predicting each mechanical characteristic, one in the range of quasi-static and the others in the range of impact corresponding to the split Hopkinson pressure bar and drop-weight-impact tests. The experimental dynamic to static ratios obtained for SFRC properties were discussed and compared with those proposed by present study and from other researchers. Three proposed models significantly improve the prediction the dynamic increase factor values in terms of compressive strength, modulus of elasticity and toughness.

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Section: Energy Absorption Capacity (Toughness)supporting

confidence: 73%

Experimental and analytical study of the high-strain-rate compressive behavior of SFRC

Bakhshi

Valente

Ramezansefat

et al. 2023

Mechanics of Advanced Materials and Structures

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“…Nevertheless, the optimal content for PP fibre is still not determined. Moreover, a number of studies examining the dynamic properties of PP fibre reinforced concrete utilised SHPB equipment with a high strain rate (i.e., normally in the range between 10 2 s −1 and 10 3 s −1 [12,26,27,28]), as the previous study mainly focused on the drop weight test. However, the method of drop weight test is greatly restricted by the specimen size and configuration [9].…”

Section: Introductionmentioning

confidence: 99%

Effects of Polypropylene Fibre and Strain Rate on Dynamic Compressive Behaviour of Concrete

et al. 2019

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This paper presents an experimental study on the dynamic compressive behaviour of polypropylene (PP) fibre reinforced concrete under various strain rates using split Hopkinson pressure bar (SHPB) equipment. The effects of PP fibre content and strain rate on the dynamic compressive stress-strain relationship and failure patterns were estimated. The results indicated that the addition of PP fibre enhanced the dynamic compressive properties of concrete mixtures although it resulted in a significant reduction in workability and a slight decrease in static compressive strength. Considering the workability, static compressive strength and dynamic compressive behaviour, the optimal PP fibre content was found to be 0.9 kg/m3 as the mixture exhibited the highest increase in dynamic compressive strength of 5.6%, 40.3% in fracture energy absorption and 11.1% in total energy absorption; further, it showed the least reduction (only 5.8%) in static compressive strength among all mixtures compared to the reference mixture without fibre. For all mixtures, the dynamic compressive properties, energy absorption capacity, strain at peak stress, ultimate strain and dynamic increase factor (DIF) were significantly influenced by strain rate, i.e., strain rate effect. When the strain rate was relatively low, PP fibres were effective in controlling the cracking, and the dynamic compressive properties of PP fibre reinforced mixtures were improved accordingly.

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“…Meanwhile, the simple superposition method of reinforcing index for each fiber is not a good choice because different fibers present different characteristics. Thus, a comprehensive reinforcing index(RI v ) was developed to describe the effect of hybrid fiber system (24,25,29). The formula of comprehensive reinforcing index is presented as follow in Equation [4]:…”

Section: Reinforcing Indexmentioning

confidence: 99%

Effect of different PVA and steel fiber length and content on mechanical properties of CaCO<sub>3</sub> whisker reinforced cementitious composites

Cao

Xie

et al. 2019

Mater. construcc.

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In this paper, calcium carbonate (CaCO3) whisker as a fiber reinforcement is mixed with steel and PVA fiber to form a multiscale hybrid fiber reinforced cementitious composites (MHFRCC). ASTM standard and post-crack strength techniques are performed to evaluate the mechanical properties of MHFRCC. The 1.25 % long steel fiber, 0.55 % short PVA fiber and 2.0 % CaCO3 whisker specimens showed the best flexural behavior before L/600 deflection. However, 1.5 % long steel fiber, 0.4 % long PVA fiber and 1.0 % CaCO3 whisker specimens presented better crack resistance after L/600 deflection. It is revealed that flexural parameters increase as comprehensive reinforcing index increase. The result showed that the CaCO3 whisker and short PVA fiber provided crack resistance effect at micro-scale and mainly play a dominate role in inhibiting micro-cracking. However, long steel fiber and long PVA fiber showed a better bridging effect of macro cracks at a large deflection.

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Strain Rate Dependent Behavior and Modeling for Compression Response of Hybrid Fiber Reinforced Concrete

Cited by 22 publications

References 48 publications

Experimental and analytical study of the high-strain-rate compressive behavior of SFRC

Experimental and analytical study of the high-strain-rate compressive behavior of SFRC

Effects of Polypropylene Fibre and Strain Rate on Dynamic Compressive Behaviour of Concrete

Effect of different PVA and steel fiber length and content on mechanical properties of CaCO<sub>3</sub> whisker reinforced cementitious composites

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