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Influence of Modified PVA Fiber on Ultra-High Performance Concrete and Its Enhancing Mechanism
Zhiyuan Chen1, Hongyu Fan1, Wanying Zheng1
1College of Transportation and Civil Engineering, Fujian Agriculture and Forestry University, Fuzhou 350108, China.
Polymers
|December 17, 2024
Summary
Modified polyvinyl alcohol (PVA) fibers enhance ultra-high-performance concrete (UHPC) properties. Optimal PVA fiber addition boosts strength and may replace steel fibers in specific applications.
Area of Science:
- Materials Science
- Civil Engineering
- Concrete Technology
Background:
- Ultra-high-performance concrete (UHPC) offers superior mechanical properties.
- Enhancing UHPC performance with alternative fibers is an active research area.
- Polyvinyl alcohol (PVA) fibers present a potential alternative to traditional steel fibers.
Purpose of the Study:
- To investigate the effects of modified PVA fibers on UHPC properties.
- To evaluate the influence of PVA fiber dosage, length, and surface treatment.
- To compare PVA fiber-reinforced UHPC with steel fiber-reinforced UHPC.
Main Methods:
- Specimen preparation with varying PVA fiber characteristics.
- Mechanical property testing (compressive and flexural strength) at different curing ages.
- Scanning electron microscopy (SEM) for fiber distribution and morphology analysis.
- Comparative analysis with steel fiber-reinforced UHPC.
Main Results:
- Mechanical properties of UHPC are significantly influenced by PVA fiber dosage, length, and surface treatment.
- Optimal PVA fiber addition increased compressive strength by 12.0% and flexural strength by 6.0% compared to plain UHPC.
- SEM analysis provided insights into fiber-matrix interaction and reinforcement mechanisms.
- PVA fibers demonstrated comparable performance to steel fibers under specific conditions.
Conclusions:
- Modified PVA fibers can effectively enhance the mechanical properties of UHPC.
- Optimized PVA fiber parameters lead to significant improvements in strength.
- PVA fiber-reinforced UHPC shows potential as a substitute for steel fiber-reinforced UHPC in certain applications, offering a promising avenue for material innovation.
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