What question did this study set out to answer?

To evaluate how variations in mechanical strength, surface roughness, and cross-sectional geometry affect the dynamic pull-out behavior and failure mechanisms of polypropylene fibers in cement-based composites.

February 4, 2021MaterialsOpen Access

Dynamic Single-Fiber Pull-Out of Polypropylene Fibers Produced with Different Mechanical and Surface Properties for Concrete Reinforcement

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Authors

EWEnrico WölfelLeibniz Institute of Polymer Research HBHarald BrünigLeibniz Institute of Polymer Research ICIurie CuroșuLWL-Universitätsklinikum Bochum

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Implication

Experimental study reveals enhanced dynamic energy absorption for rough, trilobal polypropylene fibers in cement composites, indicating improved crack-bridging performance.

Key Points

To evaluate how variations in mechanical strength, surface roughness, and cross-sectional geometry affect the dynamic pull-out behavior and failure mechanisms of polypropylene fibers in cement-based composites.
Melt-spun polypropylene fibers (10–30 µm diameter) with circular or trilobal cross-sections were fabricated with varying tensile strengths, Young's moduli, and sizing treatments.
Fiber structure and surfaces were characterized using single-fiber tensile tests, differential scanning calorimetry (DSC), scanning electron microscopy (SEM), atomic force microscopy (AFM), and contact angle measurements.
Single-fiber pull-out (SFPO) tests were performed under quasi-static and dynamic loading conditions to evaluate fiber-matrix interfacial interactions.
Higher fiber tensile strength coupled with enhanced mechanical interlocking from increased surface roughness improved dynamic energy absorption during fiber pull-out.
Switching from a circular to a trilobal cross-sectional fiber geometry further increased interfacial bonding and dynamic pull-out resistance.

Cite This Study

Wölfel et al. (2021) studied this question.

synapsesocial.com/papers/6a8ce0a1029556da77eaa220 https://doi.org/10.3390/ma14040722

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Implication

Experimental study reveals enhanced dynamic energy absorption for rough, trilobal polypropylene fibers in cement composites, indicating improved crack-bridging performance.

Dynamic Single-Fiber Pull-Out of Polypropylene Fibers Produced with Different Mechanical and Surface Properties for Concrete Reinforcement

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Implication

Key Points

Cite This Study

Dynamic Single-Fiber Pull-Out of Polypropylene Fibers Produced with Different Mechanical and Surface Properties for Concrete Reinforcement

Discussion

Member takes

Implication

Key Points

Cite This Study

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