Static and Cyclic Compressive Properties of Self-Compacting Concrete-Filled Flax Fiber–Reinforced Polymer Tubes
Publication: Journal of Composites for Construction
Volume 20, Issue 6
Abstract
In the present study, natural fiber (i.e., flax fiber) reinforced epoxy (FFRP) plates and tubes were prepared with a filament winding process. FFRP tubes with 150-mm diameter were filled with self-compacting concrete and tested in terms of static and cyclic compressive properties. Basalt fiber–reinforced epoxy (BFRP) plates and tubes were prepared and tested for comparison. The FFRP plate possesses a nominal tensile strength and modulus of 333 MPa and 48.5 GPa, respectively, and exhibits a nonlinear tensile strain-stress curve. Compared with the static tensile modulus of the FFRP plate, the strain modulus–controlled low-frequency cyclic test steadily decreases with the number of load-unload cycles as a result of cumulative damage, and the ultimate stress is also reduced by 36%. According to the static compression results, FFRP tubes exhibit a notable confinement effect on concrete cylinders. The confinement effectiveness coefficient determined by the static compression test ranges from 4 to 7 for the FFRP tubes wound with four to 12 layers of flax fibers. Cyclic compression results show that the compression stress of the concrete-filled FFRP tubes is lower than that of the static compression stress under the same compression strain. This finding is attributed to the cumulative damage of the FFRPs during the cyclic process, similar to the FFRP coupons. On the contrary, the cyclic ultimate compression strain and stress of the concrete-filled BFRP tubes are notably close to the static values.
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Acknowledgments
The authors are grateful for the financial support from the NSFC with Grant Nos. 51178147 and 51178150, the National Key Basic Research Program of China (973 Program) with Grant No. 2012CB026200, and the Key Fundamental Research Project of Shenzhen Science & Technology Research Fund (JC201005250051A).
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Published In
Journal of Composites for Construction
Volume 20 • Issue 6 • December 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Oct 12, 2015
Accepted: Feb 22, 2016
Published online: Apr 26, 2016
Discussion open until: Sep 26, 2016
Published in print: Dec 1, 2016
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