Static and Cyclic Compressive Properties of Self-Compacting Concrete-Filled Flax Fiber–Reinforced Polymer Tubes

Abstract

AbstractIn 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 ...