Effect of 3D, 4D, and 5D hooked-end type and loading rate on the pull-out performance of shape memory alloy fibres embedded in cementitious composites

Document Type

Journal Article

Publication Title

Construction and Building Materials

Volume

273

Publisher

Elsevier

School

School of Engineering

RAS ID

35459

Funders

Australian Government Research Training Program (RTP) Scholarship

Comments

Dehghani, A., & Aslani, F. (2021). Effect of 3D, 4D, and 5D hooked-end type and loading rate on the pull-out performance of shape memory alloy fibres embedded in cementitious composites. Construction and Building Materials, 273, article 121742. https://doi.org/10.1016/j.conbuildmat.2020.121742

Abstract

© 2020 Elsevier Ltd This paper investigates the single fibre pull-out performance of superelastic shape memory alloy fibres (SMAFs) embedded in a highly flowable cementitious matrix suitable for producing ultra-high performance fibre reinforced cementitious composites. The research emphasis is placed on the influence of hooked-ends and loading rate on the pull-out behaviour of SMAFs. Full-range pull-out load-slip responses are captured for straight and 3D, 4D, and 5D hooked-end SMAFs under three loading rates ranging from 0.025 mm/s (representing quasi-static loading) to 25 mm/s (representing seismic loading). Pull-out test is also carried out on steel fibres (SFs) of similar geometries as SMAFs for comparison reasons. Pull-out responses are analysed in terms of maximum tensile stress in the fibre, material usage factor, pull-out energy, average and equivalent bond strength. The results obtained show lower pull-out resistance for SMAFs comparing to their steel counterparts. Although the use of more bends at hooked-end of SFs (5D versus 3D) significantly enhances the average and equivalent bond strength of SFs at a given loading rate, its efficiency was much lower for SMAFs. The deformation process that fibres undergo when they travel through the matrix tunnel can explain such a difference between SMAFs and SFs. Experimental results show loading rate dependency for pull-out resistance of hooked-end SMAFs in terms of both average and equivalent bond strength. In contrast, loading rate dependency is observed only for equivalent bond strength in the case of straight SMAFs.

DOI

10.1016/j.conbuildmat.2020.121742

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