Synergistic effects of fiber hybridization on the fracture toughness of seawater sea-sand concrete
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Date
2024
Authors
Mashayekhi, A.
Hassanli, R.
Zhuge, Y.
Ma, X.
Chow, C.W.K.
Bazli, M.
Manalo, A.
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Journal article
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Construction and Building Materials, 2024; 444(137845)
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Abstract
This study investigates the fracture behavior of fiber-reinforced seawater sea-sand concrete (FR-SWSSC), focusing on the impact of fiber hybridization on fracture toughness properties and potential synergistic effects. The study employed micro-fibers including short polypropylene (PPS), polyvinyl alcohol (PVA), basalt fibers (BF), and macro-fibers consisting long polypropylene (PPL) and twisted polypropylene (TPPL) fibers. The results indicated that macro-fibers, PPL and TPPL, significantly enhanced the post-peak behavior of SWSSC, increasing fracture energy by 144 % and 93 % respectively, while micro-fibers alone showed negligible impact on the post-peak behavior. Micro-fiber hybridization significantly enhanced both flexural strength and fracture energy of SWSSC, with hybrid PPS/BF and PPS/PVA demonstrated notably improved fracture energy by 176 % and 290 %, respectively, compared to mono PPS. Hybrid combinations of micro/macro-fibers demonstrated a synergistic effect on fracture toughness, where PPL and TPPL fibers bridged larger cracks, activating micro-fibers for enhanced energy dissipation. Moreover, the strong interfacial bond of PVA and BF fibers with the concrete matrix improved macro-fiber bonding strength and overall fracture resistance. By exploring the synergistic effect of hybrid discrete fibers in enhancing the fracture performance of FR-SWSSC, this research promotes sustainable construction practices by addressing inherent challenges of SWSSC.
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Copyright 2024 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)