Abstract
Newly developed hooked-end pseudoelastic shape memory alloy fibres (PSMAF) provide re-centring and crack-closing behaviour in cementitious composites. Relatively large PSMAF-reinforced specimens are tested under cyclic flexural loading at small and large deflection amplitudes to examine these capabilities realistically. Crack propagation, maximum crack width at each cycle, crack-closing ratio, and full-depth crack width are quantified through 2D digital image correlation (DIC) technique for composites with 0.5% to 1.25% PSMAF. The re-centring ratios are established for the developed composites, and their flexural performances are evaluated based on various parameters, including cyclic modulus, toughness, and ductility. Furthermore, X-ray micro-computed tomography and statistical analysis of spatial point patterns are employed to examine fibre dispersion in the cracked sections. Results indicate that PSMAF-reinforced composites with 0.75% and 1% fibre content exhibit considerable re-centring and crack-closing capabilities with minimal fibre clumping.
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