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Dynamic Compressive Mechanical Properties of Polyvinyl Alcohol Fiber-Reinforced Geopolymer Composites
Mingyang Li1, Qi Liu1, Yizhong Tan1
1Training Base, Army Engineering University of PLA, Xuzhou 221116, China.
Polyvinyl alcohol (PVA) fiber-reinforced geopolymer composites (PVA-FRGC) show enhanced dynamic compressive strength and improved integrity after fragmentation. Optimal mix proportions were identified for superior dynamic mechanical performance.
Area of Science:
- Materials Science
- Civil Engineering
- Composite Materials
Background:
- Polyvinyl alcohol (PVA) fibers are crucial for enhancing fiber-reinforced geopolymer composites (FRGC).
- Systematic research on the dynamic mechanical properties of PVA-FRGC is needed.
- Understanding PVA-FRGC behavior under dynamic loading is essential for structural applications.
Purpose of the Study:
- To investigate the effects of mix proportions on the dynamic mechanical properties of PVA-FRGC.
- To determine the optimal composition for enhanced dynamic performance.
- To evaluate the influence of PVA fibers on strength, fragmentation, and energy absorption.
Main Methods:
- Orthogonal experimental design was employed.
- Split Hopkinson Pressure Bar (SHPB) testing was used to assess dynamic properties.
- Parameters studied included fly ash/slag ratio, fiber length, and fiber volume content.
Main Results:
- Fly ash/slag ratio, fiber length, and fiber volume significantly impact dynamic compressive strength and energy absorption.
- PVA fibers notably increased dynamic compressive strength, reaching up to 210.68 MPa.
- Specimen integrity post-fragmentation was significantly enhanced, with larger average particle sizes compared to plain geopolymers.
Conclusions:
- PVA fibers improve the dynamic compressive strength and fragmentation resistance of geopolymer composites.
- An optimal mix proportion of 5:5 fly ash/slag ratio, 9 mm fiber length, and 2.0% fiber volume content is recommended.
- PVA-FRGC exhibits promising potential for applications requiring high dynamic performance and durability.
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