Bonding Mechanical Properties between SMA Fiber and ECC Matrix under Direct Pullout Loads

Yang, Zhao; Gong, Xiaofeng; Wu, Qing; Liu, Fan

doi:10.3390/ma16072672

Cited by 4 publications

(2 citation statements)

References 42 publications

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“…Previous investigations primarily examined the effects of fiber shape, cementitious, and ECC matrix on the bond slip characteristics of superelastic SMA fibers in cementitious ECC mixtures. [25,26,[33][34][35][36][37]. However, comprehensive and systematic investigations of the pullout behavior in SMA Fiber-Reinforced Engineered Cementitious Composite (SMAF-ECC) matrices are notably limited.…”

Section: Introductionmentioning

confidence: 99%

Optimizing Superelastic Shape Memory Alloy Fibers (SMAF) for Enhancing Pullout Performance in Engineered Cementitious Composites (ECC)

Umar,

Qian,

Khan

et al. 2024

Preprint

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This experimental study investigates the effect of superelastic shape memory alloy fibers (SMAF) on the pullout performance of Engineered Cementitious Composite (ECC). Various diameters, forms, and surface treatments of SMAF were examined, including Linear shape (LS-SMAF), indented hook shape (HIS-SMAF), and indented shape (IS-SMAF) with diameters of 0.8 and 1.0 mm. sandpaper polishing technique was used for surface treatment. A constant water-to-cement ratio of 0.60 was used to fabricate ECC. Single-fiber pullout tests, monotonic and cyclic, were conducted on ECC mixtures incorporating various polyvinyl alcohol (PVA) content (1.5% to 2%). Scanning Electron Microscope (SEM) analysis was performed to study the internal structure of ECC. Results showed that treated IS-SMAF demonstrated superior pullout performance. Additionally, IHS-SMAF outperformed LS-SMAF, whereas ECC with higher PVA content showed excellent pullout performance. This study concludes the significance of fiber characteristics and ECC mix composition in enhancing single-fiber pullout performance.

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Section: Introductionmentioning

confidence: 99%

Optimizing Superelastic Shape Memory Alloy Fibers (SMAF) for Enhancing Pullout Performance in Engineered Cementitious Composites (ECC)

Umar,

Qian,

Khan

et al. 2024

Preprint

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show abstract

“…Zhao Yang et al [19] showed that when SMA fibers are effectively anchored in the ECC matrix, the superelastic characteristics of SMA fibers can be fully utilized, providing a flagshaped hysteretic energy dissipation capacity for SMAF-ECC beams and providing recovery force for composite material beams during unloading, enabling the beam to achieve selfclosing of cracks and self-recovery of deflection. Meanwhile, Zhao Yang et al [20] found that by setting up the end-knotted form of fibers, the SMAF-ECC half-dog bone specimens were subjected to direct drawing tests, and it was concluded that the knotted-end form could effectively improve the bonding performance between SMA fibers and ECC matrix, which provided the basic conditions for making full use of the superelasticity of SMA materials. In addition, Zhao Yang et al [21] conducted uniaxial cyclic tensile tests to investigate the self-recovery performance of SMAF-ECC under cyclic tensile.…”

Section: Introductionmentioning

confidence: 99%

The Effect of SMA Fiber Content on the Bending and Self-Recovery Performance of ECC Beams

Yang

Ren

2023

Materials

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The addition of superelastic shape memory alloy fibers (SMAF) into engineering cementitious composites (ECC) can create a new type of SMAF-ECC composite material with good self-recovery and energy dissipation performance, which is very suitable for seismic structures. In this study, 10 groups of beam specimens with different volume contents of SMAF were fabricated, and the bending performance, deflection recovery and energy dissipation ability of these beams were studied through three-point bending cyclic loading tests. The failure mode, peak load, load–deflection curve, crack width and other indicators of the specimens were analyzed, and the relationship expression between fiber content and bending strength was established by fitting analysis. The results show that adding SMA fibers can significantly improve the peak load of ECC beams, with a maximum increase of 48.31%. The knotted SMA fibers can fully exert their superelasticity, providing the beam specimens with crack self-closing and deflection recovery ability. When the volume content of SMA fibers is 0–0.6%, the bending strength, energy dissipation ability and deflection recovery ability of the composite material beams increase with the increase in fiber content. When the volume content of SMA fibers is 0.6–1.0%, the above indicators decrease with the increase in fiber content. The suggested equations can well reflect the relationship between fiber content and beam bending strength. The research results of this paper provide theoretical support for the engineering application of SMAF-ECC composite materials.

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Optimizing superelastic shape-memory alloy fibers for enhancing the pullout performance in engineered cementitious composites

Umar,

Qian,

Almujibah

et al. 2024

Science and Engineering of Composite Materials

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This study explores the effect of integrated superelastic shape-memory alloy fibers (SMAFs) on the mechanical performance of engineered cementitious composites (ECCs). Various SMAF configurations – linear-shaped SMAFs (LS-SMAFs), hook-shaped SMAFs (HS-SMAFs), and indented-shaped SMAFs (IS-SMAFs) – with diameters of 0.8 and 1.0 mm were incorporated into ECC matrices, and surface texturization was achieved through abrasive paper treatment. Their mechanical properties were assessed through single fiber pullout tests on ECC mixtures containing 1.5 and 2.0% polyvinyl alcohol (PVA), subjected to both monotonic and cyclic loading conditions. Qualitative analysis, employing scanning electron microscopy, demonstrated that the IS-SMAF configuration provided superior mechanical interlocking and fiber–matrix adhesion, with a distinct flag shape observed during tensile testing. Quantitative data indicated that IS-SMAFs significantly improved the tensile strength and pullout resistance, with slip distances of ≥5 mm and average pullout loads ranging from 263 to 403 N. LS-SMAFs demonstrated better performance compared to HS-SMAFs and LS-SMAFs in terms of tensile and pullout characteristics. Additionally, ECCs with increased PVA content exhibited enhanced withdrawal performance. Thermogravimetry analysis and X-ray diffraction provided insights into the high-temperature stability and crystalline structure of the composites. These results underscore the effectiveness of IS-SMAFs in enhancing ECC properties, offering significant implications for the development and optimization of high-performance composite materials in civil engineering applications.

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Bonding Mechanical Properties between SMA Fiber and ECC Matrix under Direct Pullout Loads

Cited by 4 publications

References 42 publications

Optimizing Superelastic Shape Memory Alloy Fibers (SMAF) for Enhancing Pullout Performance in Engineered Cementitious Composites (ECC)

Optimizing Superelastic Shape Memory Alloy Fibers (SMAF) for Enhancing Pullout Performance in Engineered Cementitious Composites (ECC)

The Effect of SMA Fiber Content on the Bending and Self-Recovery Performance of ECC Beams

Optimizing superelastic shape-memory alloy fibers for enhancing the pullout performance in engineered cementitious composites

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