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Uniaxial tensile behavior of aligned steel fibre reinforced cementitious composites

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Abstract

By applying an external uniform magnetic field to a fresh cement mixture during casting, an aligned steel fibre reinforced cementitious composites (ASFRC) was prepared. This investigation compares the performance of ASFRC with its counterpart—ordinary steel fibre reinforced cementitious composite (SFRC) containing randomly distributed steel fibres. First, the orientation of the steel fibres in ASFRC and SFRC specimens was examined using X-ray computed tomography analysis; this confirmed that the steel fibres were effectively aligned in the ASFRC. Then, uniaxial tensile tests were performed to allow a comparison of the uniaxial tensile stress–strain curves of the ASFRC and SFRC; and to determine the advantages, if any of ASFRC over SFRC in terms of uniaxial tensile strength (fUtu), ultimate strain (εUtu) and energy dissipation (Gf-A). The uniaxial tensile test results were also used to show that, if the tensile strength of ASFRC is equal to that of SFRC (actually slightly exceeding) using the aligned steel fibre technology, the dosage of steel fibres can be reduced at least 40%. It was also found that the alignment of the steel fibres affects the strain-hardening and multiple cracking behavior of the composites during uniaxial tension testing. Finally, the multiple cracking behavior of the composites was analyzed using a digital image correlation method. These results show that ASFRC exhibits a multiple cracking pattern at a much lower fibre content compared to SFRC.

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Acknowledgements

The work presented in the paper was supported by the National Natural Science Foundation of China (Nos. 51578208, 51878239, 51779069 and 5171101996).

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Correspondence to Ru Mu.

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Qing, L., Yu, K., Mu, R. et al. Uniaxial tensile behavior of aligned steel fibre reinforced cementitious composites. Mater Struct 52, 70 (2019). https://doi.org/10.1617/s11527-019-1374-5

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Keywords

  • Steel fibre reinforced cementitious composites
  • Aligned steel fibre
  • Uniaxial tensile strength
  • Strain-hardening
  • Multiple cracking