Purwandy Hasibuan, Taufiq Saidi, Muttaqin Hasan, Akhyar Akhyar
The use of abaca-fiber as an alternative material in natural fiber-reinforced polymer composites (NFPCs) reinforcement for concrete columns offers not only technical advantages in terms of strength and production energy efficiency, but also presents a sustainable bio-material-based solution. This study aims, to evaluate the structural performance of cylindrical reinforced concrete (RC) columns externally confined using NFPCs sheets made from abaca-fibers. Two confinement techniques were applied: spiral and partial wrapping. The test specimens measured 205 mm (in-diameter) x 615 mm (in-height) and were reinforced internally with six longitudinal (10 mm diameter) and transverse steel bars (8 mm diameter) reinforcement. One specimen was strengthened using a confinement spiral wrapping of NFPCs (CS-NFPCs), while another employed partial confinement (CP-NFPCs). Axial compressive tests under monotonic loading were performed, and compared to an unconfined control specimen normal confinement (NC). The spiral NFRP confinement improved the axial load capacity by 22.68% and significantly enhanced ductility by 347%. In contrast, partial wrapping resulted in a 13.79% increase in axial capacity and a 50% improvement in ductility. These findings demonstrate the effectiveness of abaca-fiber based NFPC as a sustainable alternative for enhancing both strength and ductility in RC columns. © 2026, Politechnika Lubelska. All rights reserved.
Doctoral Program of Engineering, Universitas Syiah Kuala, Jalan Tgk. Chik Pante Kulu No.5, Darussalam, Banda Aceh, 23111, Indonesia; Civil Engineering Department, Universitas Syiah Kuala, Jalan Syech Abdurrauf No7 Darussalam, Banda Aceh, 23111, Indonesia; Mechanical Engineering Department, Universitas Syiah Kuala, Jalan Syech Abdurrauf No.7, Darussalam, Banda Aceh, 23111, Indonesia
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