Effects of steel fibre-aggregate interaction on mechanical behaviour of steel fibre reinforced concrete

Ige, Olubisi; Barnett, S. J.; Chiverton, John; Nassif, Ayman Y.; Williams, J.

doi:10.1080/17436753.2017.1284389

Cited by 13 publications

(7 citation statements)

References 15 publications

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“…13 show that the H vol values possess a marked distinction between the different aggregate types and what appears to be a higher correlation with the peak load performance of the material in the different cores. Peak load values in kN can be seen in Table II, details of which were described by Ige et al [48]. The SOP and efficiency factors results did not differentiate between aggregate types.…”

Section: B User Study Of Steel Fiber Reinforced Concretementioning

confidence: 70%

“…A smaller diameter potentially increases the number of fibers for a given weight and therefore the potential for fibers to be distributed more densely across the matrix thereby improving the mechanical properties of the materials. The influence of these factors can be seen in the load bearing capacity of concrete panels as described by Ige et al [48] where it The entropy based results (a,c) appear to consistently show that the 10mm based aggregate fiber concrete cores are more randomly distributed, however the Entropy calculations also appear to identify greater relative differences between the 20mm and 10mm aggregate cores in comparison to SOP values and the efficiency factors, also quantified in Table III. Comparison of three randomly generated Probability Mass Functions (PMF).…”

Section: B User Study Of Steel Fiber Reinforced Concretementioning

confidence: 80%

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Multiscale Shannon’s Entropy Modeling of Orientation and Distance in Steel Fiber Micro-Tomography Data

Chiverton

Ige

Barnett

et al. 2017

IEEE Trans. on Image Process.

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This paper is concerned with the modeling and analysis of the orientation and distance between steel fibers in X-ray micro-tomography data. The advantage of combining both orientation and separation in a model is that it helps provide a detailed understanding of how the steel fibers are arranged, which is easy to compare. The developed models are designed to summarize the randomness of the orientation distribution of the steel fibers both locally and across an entire volume based on multiscale entropy. Theoretical modeling, simulation, and application to real imaging data are shown here. The theoretical modeling of multiscale entropy for orientation includes a proof showing the final form of the multiscale taken over a linear range of scales. A series of image processing operations are also included to overcome interslice connectivity issues to help derive the statistical descriptions of the orientation distributions of the steel fibers. The results demonstrate that multiscale entropy provides unique insights into both simulated and real imaging data of steel fiber reinforced concrete.

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Section: B User Study Of Steel Fiber Reinforced Concretementioning

confidence: 70%

Section: B User Study Of Steel Fiber Reinforced Concretementioning

confidence: 80%

Multiscale Shannon’s Entropy Modeling of Orientation and Distance in Steel Fiber Micro-Tomography Data

Chiverton

Ige

Barnett

et al. 2017

IEEE Trans. on Image Process.

Self Cite

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show abstract

“…Their material properties vary. The addition of steel fibers to concrete can significantly improve the tensile, compressive, flexural, corrosion resistance and high temperature resistance of concrete [ 16 , 17 , 18 , 19 , 20 ]. The addition of polypropylene fibers can optimize the pore size distribution of concrete and improve the crack resistance of concrete [ 14 ] and adding basalt fibers to concrete can improve the permeability, carbonation resistance, acid and alkali corrosion resistance, frost resistance and high temperature resistance of the structures [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Flexural Toughness Test and Inversion Research on a Thermal Conductivity Formula on Steel Fiber-Reinforced Concrete Components Post-Fire

Chen

Zhu

et al. 2022

Materials

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Steel fibers are widely used because they can effectively improve the tensile, compressive and flexural properties of concrete structures. The selection of steel fiber dosage and aspect ratio at high temperature has an important impact on the flexural toughness of concrete components post-fire. In this paper, discussions are made on the simulated fire test in compliance with the ISO 834 standard to study the steel fiber-reinforced concrete (SFRC) components post-fire. The research reveals the influence of two commonly used steel fiber aspect ratios (50, 70) and steel fiber dosages (30 kg/m3, 40 kg/m3, 45 kg/m3) on the changes of the internal temperature field, the initial crack flexural strength and the flexural toughness of the SFRC components under a single-side fire. Moreover, combined with the four-point flexural test of the SFRC components post fire, the research also describes the damage of high temperatures to the flexural toughness of SFRC components, and suggests a calculation formula for SFRC thermal conductivity by way of the numerical inversion method. The results of this study have verified that the incorporation of steel fiber into concrete helps to reduce its internal thermal stress difference and improve the crack resistance and fire resistance of the concrete. Moreover, under high temperature conditions, the concrete component added with the steel fiber in an aspect ratio of 70 and a dosage of 45 kg/m3 increased their initial crack flexural strength by 56.8%, higher than that of plain concrete components, and the loss of equivalent flexural strength and flexural toughness of SFRC post fire was only 45.2% and 13.6%, respectively. The proposed calculation formula of thermal conductivity can provide a reference for a numerical simulation study of the temperature field of SFRC components in a high temperature environment.

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“…He found that by adding coconut fiber, compressive and flexural strengths were increased to 13% and 9%, respectively. However, in terms of durability, the chloride diffusion resistance was reduced [10] Previous studies have confirmed that fiber can improve the mechanical properties of concrete [11][12][13][14][15][16], but there are different opinions on the chloride diffusion resistance. Some researchers think that fiber can enhance the chloride diffusion resistance of concrete, but the other researchers hold the opposite opinion.…”

Section: Introductionmentioning

confidence: 99%

Influence of Combined Action of Steel Fiber and MgO on Chloride Diffusion Resistance of Concrete

Jiang

Deng

et al. 2020

Crystals

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To improve the chloride diffusion resistance and durability of concrete, a new kind of steel fiber reinforced MgO concrete (SFRMC) was made by adding steel fiber and MgO to concrete simultaneously. With steel fiber for load bearing and expansion limiting, MgO as the expander, SFRMC has both the advantages of fiber reinforced concrete and expansion concrete. The influence of steel fiber and MgO on the strength and chloride diffusion resistance of concrete was evaluated by splitting tensile test and chloride diffusion test. Mercury intrusion porosimeter (MIP) and scanning electron microscopy (SEM) were used to study the microstructure of SFRMC. The results showed that the combined action of steel fiber and MgO reduced the porosity of concrete and the chloride diffusion coefficient (CDC), which could not be achieved by steel fiber and MgO separately. In the free state, the expansion energy produced by the hydration of MgO made the concrete expand outwards. However, under the constraint of steel fiber, the expansion energy was used to tension the fiber, resulting in self-stress. In this way, compared to reference concrete RC, the tensile strength of SFRMC-1, SFRMC-2, and SFRMC-3 increased by 3.1%, 61.3%, and 64.5%, CDC decreased by 8.8%, 36.7%, and 33.1%, and the porosity decreased by 6.2%, 18.4%, and 20.6%, respectively. In addition, the SEM observations demonstrated that the interfacial transition zone (ITZ) between fiber and matrix was denser in SFRMC, which contributed to reduce the diffusion of chloride ions in the concrete.

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Effects of steel fibre-aggregate interaction on mechanical behaviour of steel fibre reinforced concrete

Cited by 13 publications

References 15 publications

Multiscale Shannon’s Entropy Modeling of Orientation and Distance in Steel Fiber Micro-Tomography Data

Multiscale Shannon’s Entropy Modeling of Orientation and Distance in Steel Fiber Micro-Tomography Data

Flexural Toughness Test and Inversion Research on a Thermal Conductivity Formula on Steel Fiber-Reinforced Concrete Components Post-Fire

Influence of Combined Action of Steel Fiber and MgO on Chloride Diffusion Resistance of Concrete

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