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A platform for research: civil engineering, architecture and urbanism
Effects of PVA fiber on shrinkage deformation and mechanical properties of ultra-high performance concrete
Abstract This research delves into the effects of polyvinyl alcohol (PVA) fibers on the shrinkage characteristics of ultra-high performance concrete (UHPC). Despite significant scholarly efforts to mitigate shrinkage in UHPC, a comprehensive understanding of the influence of PVA fibers, a vital UHPC component, on shrinkage mechanisms remains elusive. The study systematically explores the effects of varying lengths and volume fractions of PVA fibers on the autogenous shrinkage, total shrinkage, and compressive strength in UHPC. The results reveal that PVA fibers with a 0.5% dosage lead to a substantial 28.34% reduction in the autogenous shrinkage of UHPC. Additionally, PVA fibers with a length of 12 mm exhibit optimal inhibitory effects on the total shrinkage, surpassing the performance of 9 mm fibers. The study underscores that a higher aspect ratio and lower dosage of PVA fibers prove more effective in minimizing UHPC shrinkage. Noteworthy is the observation that, at a 0.5% dosage and a length of 12 mm, PVA fibers contribute to achieving maximum compressive strength (134 MPa), surpassing plain concrete by 20.4%. The study attributes this strength enhancement to the high bonding strength between PVA fibers and the matrix, which effectively restrains shrinkage stress. However, the entangled fibers at high dosages is detrimental to both the compressive strength and shrinkage inhibition.
Highlights The effect of PVA fiber characteristics on the shrinkage mechanism of UHPC. The inhibition effect of PVA fiber on autogenous shrinkage was more significant. PVA fibers can not only inhibit shrinkage but also enhance strength.
Effects of PVA fiber on shrinkage deformation and mechanical properties of ultra-high performance concrete
Abstract This research delves into the effects of polyvinyl alcohol (PVA) fibers on the shrinkage characteristics of ultra-high performance concrete (UHPC). Despite significant scholarly efforts to mitigate shrinkage in UHPC, a comprehensive understanding of the influence of PVA fibers, a vital UHPC component, on shrinkage mechanisms remains elusive. The study systematically explores the effects of varying lengths and volume fractions of PVA fibers on the autogenous shrinkage, total shrinkage, and compressive strength in UHPC. The results reveal that PVA fibers with a 0.5% dosage lead to a substantial 28.34% reduction in the autogenous shrinkage of UHPC. Additionally, PVA fibers with a length of 12 mm exhibit optimal inhibitory effects on the total shrinkage, surpassing the performance of 9 mm fibers. The study underscores that a higher aspect ratio and lower dosage of PVA fibers prove more effective in minimizing UHPC shrinkage. Noteworthy is the observation that, at a 0.5% dosage and a length of 12 mm, PVA fibers contribute to achieving maximum compressive strength (134 MPa), surpassing plain concrete by 20.4%. The study attributes this strength enhancement to the high bonding strength between PVA fibers and the matrix, which effectively restrains shrinkage stress. However, the entangled fibers at high dosages is detrimental to both the compressive strength and shrinkage inhibition.
Highlights The effect of PVA fiber characteristics on the shrinkage mechanism of UHPC. The inhibition effect of PVA fiber on autogenous shrinkage was more significant. PVA fibers can not only inhibit shrinkage but also enhance strength.
Effects of PVA fiber on shrinkage deformation and mechanical properties of ultra-high performance concrete
Yao, Jie (author) / Ge, Yali (author) / Ruan, Wenqiang (author) / Meng, Jing (author)
2024-02-07
Article (Journal)
Electronic Resource
English
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Autogenous shrinkage behavior of ultra-high performance concrete
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