Dynamic compressive behaviour of spiral steel fibre reinforced concrete in split Hopkinson pressure bar tests

Hao, Yifei; Hao, Hong

doi:10.1016/j.conbuildmat.2013.07.022

Cited by 224 publications

(93 citation statements)

References 31 publications

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“…For static loading conditions, HFRC composites result in better energy absorbing properties compared with that of mono-fiber concrete composites (Chen et al, 1996;Abou El-Mal et al, 2015;Li, 2012). A new type of steel fiber with spiral shape, proposed recently (Xu et al, 2012a(Xu et al, , 2012b, has been found to demonstrate larger displacement capacity and provide better bonding compared to hookedend, deformed and corrugated fibers (Hao and Hao, 2013;Hao et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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

Ibrahim

Almusallam

Al-Salloum

et al. 2016

Lat. Am. j. solids struct.

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This paper investigates the stress-strain characteristics of Hybrid fiber reinforced concrete (HFRC) composites under dynamic compression using Split Hopkinson Pressure Bar (SHPB) for strain rates in the range of 25 to 125 s -1 . Three types of fibers -hooked ended steel fibers, monofilament crimped polypropylene fibers and staple Kevlar fibers were used in the production of HFRC composites. The influence of different fibers in HFRC composites on the failure mode, dynamic increase factor (DIF) of strength, toughness and strain are also studied. Degree of fragmentation of HFRC composite specimens increases with increase in the strain rate. Although the use of high percentage of steel fibers leads to the best performance but among the hybrid fiber combinations studied, HFRC composites with relatively higher percentage of steel fibers and smaller percentage of polypropylene and Kevlar fibers seem to reflect the equally good synergistic effects of fibers under dynamic compression. A rate dependent analytical model is proposed for predicting complete stress-strain curves of HFRC composites. The model is based on a comprehensive fiber reinforcing index and complements well with the experimental results.

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Section: Introductionmentioning

confidence: 99%

“…Two different equations for calculating the DIF (strength) were given. DIF (strength) and DIF (toughness) models were given by Hao and Hao (2013) for SFRC containing spiral fibers. However, different models were given for different percentage of steel fibers for both DIF (strength) and DIF (toughness).…”

Section: Introductionmentioning

confidence: 99%

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

Ibrahim

Almusallam

Al-Salloum

et al. 2016

Lat. Am. j. solids struct.

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“…Using a self-designed testing container and the air supply system, the system can also be used to carry out the permeability test, and the maximum of gas injection pressure can reach 12 MPa. (3) e Split Hopkinson pressure bar (SHPB) apparatus consists of an emitting cavity, a cone-shaped striker, an input bar, a transmitter bar, an absorption bar, and a data acquisition system [34,35]. e lengths and diameters of the t input and output bars are 2500 m and 50 mm, respectively.…”

Section: Experimental Apparatusmentioning

confidence: 99%

Experimental Study and Application of a Novel Foamed Concrete to Yield Airtight Walls in Coal Mines

Wen

Fan

Zhang

et al. 2018

Advances in Materials Science and Engineering

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Airtight walls are vital to prevent spontaneous combustion of residual coal as caused by air leakage. A new type of foamed concrete (FC) was developed to control air leakage. FC specimens of four densities (250, 450, 650, and 850 kg/m 3 ) were prepared for use in a series of physical and mechanical tests. A thickener was used to control the FC shrinkage and collapse. e permeability of the FC decreased approximately exponentially with an increasing density. On the contrary, the compressive strength (σ) and elastic modulus (E) increased in exponential and linear relationship separately with the increase in density, under uniaxial compression conditions. Under triaxial compression, the compressive strength of the FC increased with an increase in confining pressure and appeared slight plastic. e impact experiment showed that the dynamic compressive strength of the FC appeared to be strain-rate dependent, and it increased with an increase in the strain rate and pressure under a confining pressure. Without a confining pressure, the variation in compressive strength exhibited a slow decrease. Applied FC resulted in a 5 MPa 28-day compressive strength of the airtight wall with no remaining fissures and with air leakage suppression to the gob.

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“…The SFRC with spiral-shaped fibres has demonstrated to outperform SFRC with other types of steel fibres [4][5][6][7][8][9][10], due to its better bonds to concrete than other fibre types. Despite observations of good performance of concrete materials reinforced with spiral-shaped steel fibres, like concrete reinforced with other fibre types, fluctuations of mechanical properties of the SFRC materials have been observed in all the previous studies.…”

Section: Introductionmentioning

confidence: 99%

“…Fibre distribution characteristics, including the degree of fibre dispersion, fibre unit number, and packing density, were found to strongly influence the ultimate flexural strength, while hardly affect the first cracking strength. In [8], extensive impact tests were conducted on SFRC specimens and a number of dynamic stress-strain curves under different strain rates obtained. The corresponding empirical DIF relations for spiral SFRC were proposed based on the testing data.…”

Section: Introductionmentioning

confidence: 99%

An efficient method to derive statistical mechanical properties of concrete reinforced with spiral-shaped steel fibres in dynamic tension

Wang

Hao

et al. 2016

Construction and Building Materials

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Steel-fibre-reinforced concrete (SFRC) has been recognised as an effective solution to resist impact loading on structures. The reliable application and efficient design of SFRC structures depends on the knowledge of its mechanical properties. Since many important factors, including the locations and orientations of fibres and aggregates in concrete and the material properties of concrete matrix, are intrinsically random, the mechanical properties of SFRC present a high level of randomness. To accurately quantify them, effective statistical techniques are indispensable. Using traditional statistical techniques, a large quantity of data, from either experiments or numerical simulations, are needed to derive the correlation between the mechanical properties and the random factors. However, both ways are time-consuming and costly. Therefore, very little information regarding the statistical mechanical properties of SFRC can be found in the current literature. In this study, a kernel-based nonparametric statistical method is proposed to derive the statistical mechanical properties of SFRC with limited number of data. The behaviours of SFRC with randomly distributed spiral-shaped fibres and aggregates under impact loading are simulated using commercial software LS-DYNA. The simulation accuracy is validated by the experimental results. The influences of various volume fractions of fibres on dynamic increase factor (DIF) of the tensile strength of SFRC specimens under dynamic loadings at different strain rates are quantified through a prediction model obtained from kernel regression. The results demonstrate that the proposed method is able to estimate the DIF value of SFRC based on the tensile strength and strain rate, and to derive the statistical mechanical properties of SFRC.

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Dynamic compressive behaviour of spiral steel fibre reinforced concrete in split Hopkinson pressure bar tests

Cited by 224 publications

References 31 publications

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

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

Experimental Study and Application of a Novel Foamed Concrete to Yield Airtight Walls in Coal Mines

An efficient method to derive statistical mechanical properties of concrete reinforced with spiral-shaped steel fibres in dynamic tension

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