Long-term properties evolution and life prediction of glass fiber reinforced thermoplastic bending bars exposed in concrete alkaline environment

Xian, Guijun; Bai, Yanbo; Zhou, Ping; Wang, Junqi; Li, Chenggao; Dong, Shaoce; Guo, Rui; Tian, Jingwei; Li, Jinhao; Zhong, Jian; He, Taipeng; Zhang, Zhuo

doi:10.1016/j.jobe.2024.109641

Journal of Building Engineering

2024

DOI: 10.1016/j.jobe.2024.109641

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Long-term properties evolution and life prediction of glass fiber reinforced thermoplastic bending bars exposed in concrete alkaline environment

Guijun Xian,

Yanbo Bai,

Ping Zhou

et al.

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Cited by 24 publications

References 39 publications

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A biodegradable bi‐layer nano fibrous membrane fabricated by centrifugal spinning for active food packaging

Chen,

Li,

et al. 2024

J of Applied Polymer Sci

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To solve the problem of cytotoxicity for most antimicrobial agents loaded in packaging materials, we developed a novel bi‐layer fibrous membrane by using centrifugal spinning, which of the outer layer was submicron native potato starch/polyvinyl alcohol (ST/PVA) composite fibers loaded with ZnO nanoparticles (ZnO NPs) for providing high antibacterial activity. The inner layer was nano‐based calcium alginate/polyethylene oxide (CA/PEO) fiber for providing excellent biocompatibility. The addition of ZnO caused the semicrystalline structures of ST/PVA fibers, while the CA/PEO fibers were shown semicrystalline structures due to the PEO. Fourier transform infrared indicated that posttreatment had not effect on the structures of ST/PVA/ZnO fiber, but the structure of CA/PEO fibers were affected by interaction between COO groups of alginate and Ca2+ ions. The results of mechanical property demonstrated that CA/PEO fibers showed highest stress of 3.83 ± 0.25 MPa and helpful for improving the stress of bi‐layer fibrous membrane. The obtained fibrous membrane had excellent antibacterial property with diameters of bacteriostatic zone against E. coli and S. aureus of 20.5 and 21.5 mm, respectively. On this basis, the shelf life of strawberry was improved up to 6th day by inhibit the growth of microorganisms, which indicated that the obtained fibrous membrane showed great potential for food packaging.

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A biodegradable bi‐layer nano fibrous membrane fabricated by centrifugal spinning for active food packaging

Chen,

Li,

et al. 2024

J of Applied Polymer Sci

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Effect of fiber surface treatment with silane coupling agents and carbon nanotubes on mechanical properties of carbon fiber reinforced polyamide 6 composites

Du,

Xian,

Tian

et al. 2024

Polymer Composites

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The mechanical properties of carbon fiber (CF) reinforced thermoplastic polymer composites are primarily governed by the interphase between CFs and matrix. However, the inherent inertness of CF surfaces combined with the high viscosity and processing temperatures of thermoplastic resin often result in relatively weak interfacial bonding. This study aims to enhance the interfacial adhesion of carbon fiber reinforced polyamide 6 composites to improve their mechanical properties. CFs were de‐sized and oxidized, followed by re‐sizing with silanized carbon nanotubes. Fracture morphology and composition analysis of the fibers were conducted, and the fibers were subsequently incorporated into composites for mechanical testing. Results revealed a 20.0% increase in tensile strength, a 25.11% increase in flexural strength, and a 24.88% increase in interlaminar shear strength for the resized‐carbon fiber reinforced polyamide 6 composites compared to the pristine‐carbon fiber reinforced polyamide composites. The cross‐sectional morphology of the modified composites exhibited a zig‐zag fracture pattern. Dynamic mechanical analysis indicated that the modified fibers required higher activation energy for the free movement of the polyamide 6 molecular chain. These findings suggest that surface treatment enhances the interfacial adhesive between CF and resin, thereby significantly improving the mechanical properties of carbon fiber reinforced polyamide 6 composites.Highlights An efficient and reliable carbon fiber surface treatment method is proposed. Surface modification improves surface chemical activity of carbon fibers. Composites show substantial improvements in mechanical properties. Interfacial performance enhancement mechanism of composite was revealed.

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Hygrothermal aging behavior of C/GFRP hybrid rod with bundle‐by‐bundle dispersion

Xian,

Chen,

Tian

et al. 2024

Polymer Composites

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Fiber hybrid with bundle‐by‐bundle dispersion can achieve the high performance of composites, fully understand the hybrothermal resistance of hybrid composites is the key to prove the applications in engineering structures. In the present paper, the hygrothermal resistance performances of new type carbon and glass fiber reinforced epoxy based hybrid rod with bundle‐by‐bundle dispersion produced by pultrusion technology is investigated experimentally. The tests of water absorption and desorption, thermal and mechanical performances are performed to obtain the evolution rules of hygrothermal aging. As a result, the water absorption of hybrid rod confirms to the Fick's diffusion behavior, the serious relaxation of resin matrix and the interfacial debonding of fiber‐resin exposed at high temperature provide more diffusion space for water molecules. Long‐term hydrothermal aging results in the recoverable plasticization of resin matrix and irrecoverable interfacial debonding of fiber‐resin, which brings about the degradation of 6.7%–15.0% for short beam shear strength (SBSS) retention. In addition, the plasticization effect reduces the cross‐linking density of resin matrix, which leads to the degradation of 3.3%–15.6% for glass transition temperature (Tg) retention. The life prediction results show that degradation rate of SBSS is gradually slow down and reached to a stable retention of 85.5%.Highlights Relaxation of resin matrix and interfacial debonding accelerate the diffusion of water molecules. Plasticization and interfacial debonding lead to the degradation of short beam shear strength retention and glass transition temperature. Long‐term life prediction shows that short beam shear strength e retention is 85.5%.

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Long-term properties evolution and life prediction of glass fiber reinforced thermoplastic bending bars exposed in concrete alkaline environment

Cited by 24 publications

References 39 publications

A biodegradable bi‐layer nano fibrous membrane fabricated by centrifugal spinning for active food packaging

A biodegradable bi‐layer nano fibrous membrane fabricated by centrifugal spinning for active food packaging

Effect of fiber surface treatment with silane coupling agents and carbon nanotubes on mechanical properties of carbon fiber reinforced polyamide 6 composites

Hygrothermal aging behavior of C/GFRP hybrid rod with bundle‐by‐bundle dispersion

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