Pullout Response of Ultra-High-Performance Concrete with Twisted Steel Fibers

Ye, Judong; Liu, Guohua

doi:10.3390/app9040658

Cited by 5 publications

(2 citation statements)

References 22 publications

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“…To examine the morphology of the PVA fiber bundles after the specimens were formed, MXCT was performed using the Nikon XTH320 MXCT facility at Zhejiang University, Hangzhou, China, as shown in Figure 5b. The scanning parameters used included an exposure time of 500 ms, a voltage of 200 kV, a current of 100 µA, and a scanning accuracy of approximately 30 µm [40]. Image processing was performed using VGStudio MAX 3.0 software, and 2D slices and 3D solid images were obtained by reconstructing the data from the original MXCT data.…”

Section: Specimensmentioning

confidence: 99%

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Interaction Mechanism of Cementitious Composites Containing Different Twisted PVA Fiber Bundles

Zhang,

Hu,

Duan

et al. 2023

Buildings

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Fiber-reinforced cementitious composites (FRCCs) have made significant progress in improving the tensile and flexural properties of concrete members. Studies have shown that polyvinyl alcohol (PVA) fibers can effectively enhance the toughness of FRCCs, but the haphazard distribution of short-cut fibers makes it difficult to give full play to the high tensile strength of the fibers, and it is difficult for bundled fibers to effectively bond with the concrete substrate, which has become a challenge in the study of changing materials. Twisting the fibers by a physical process to improve the bonding performance of PVA fibers with FRCC substrate is a safe and feasible solution. However, research on silicate cementitious composites reinforced with twisted PVA fibers is limited. In this study, the interaction mechanism of through-length twisted PVA FRCCs with different twist factors and fiber bundle numbers was investigated. A concrete matrix material configured from silicate cement, fly ash, silica fume, and medium sand, in which PVA fibers with different twist factors were pre-incorporated, was used for the tests. Three-point bending tests were carried out on specimens with different twist factors (0, 50, 100, and 150 twists per meter) and fiber bundle numbers 1, 2, and 3. Compared to the untwisted PVA fiber specimens, the twist factor of 100 and the single fiber bundle specimens showed significant improvements in the bending properties, including a 36% increase in deflection, a 68% increase in the equivalent bending stress, and a 119% increase in energy consumption. Micro-X-ray computed tomography scans showed improved bending properties and energy consumption capabilities due to enhanced bonding properties as a result of the increased fiber–matrix interaction area and surface toughness.

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Section: Specimensmentioning

confidence: 99%

“…Buildings 2023, 13, x FOR PEER REVIEW 6 of approximately 30 µm [40]. Image processing was performed using VGStudio MA software, and 2D slices and 3D solid images were obtained by reconstructing the from the original MXCT data.…”

Section: Specimens Bundles Twist Factormentioning

confidence: 99%