Joule heating as a smart approach in enhancing early strength development of mineral-impregnated carbon-fibre composites (MCF) made with geopolymer

Junger, Dominik; Liebscher, Marco; Zhao, Jitong

doi:10.1016/j.compositesa.2021.106750

Cited by 23 publications

(11 citation statements)

References 58 publications

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“…The intrinsic self‐healing mechanism selected in this work was based on the softening of COC through a thermal mending process. In order to generate the thermal stimulus through the Joule effect, the evaluation of the resistivity of the produced laminates is fundamental 47 . At this aim, resistivity measurements were carried out by analyzing the voltage–current relationship for each sample 48 .…”

Section: Resultsmentioning

confidence: 99%

“…In order to generate the thermal stimulus through the Joule effect, the evaluation of the resistivity of the produced laminates is fundamental. 47 At this aim, resistivity measurements were carried out by analyzing the voltage-current relationship for each sample. 48 Table 5 reports the results obtained from the resistivity measurements, in terms of volume and surface resistivity.…”

Section: Evaluation Of the Healing Efficiencymentioning

confidence: 99%

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Novel epoxy/cyclic olefin copolymer/carbon structural composites with electro‐activated self‐healing properties

et al. 2023

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Multifunctional self‐healing composites have great potential in several applications, i.e., from automotive to aerospace. This study examines the self‐healing behavior of carbon fiber reinforced composites by depositing jet‐spun cyclic olefin copolymer (COC) meshes on dry carbon fiber plies before lamination with epoxy resin (EP). Three different laminates were prepared, including neat EP/CF and two composites with 4 wt.% and 8 wt.% of COC in the form of a jet‐spun network as a healing agent. The introduction of COC mesh reduced flexural stress by 26% and interlaminar shear strength by 50%. Mode I interlaminar fracture toughness (GI) was evaluated and specimens were mended at 110°C by resistive heating generated by an electrical current flowing within the samples. The laminates containing 8 wt% COC reported a healing efficiency, evaluated as the ratio between the GI and as the ratio of the maximum load (PMAX) of virgin and healed samples, of 9.4% and 33.7%, respectively. Fractography analysis highlighted the poor adhesion between the COC mesh and EP matrix, and several COC microfibers were trapped inside the epoxy matrix, hindering their diffusion inside the crack zone, which limited the healing capability of the prepared laminates.

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Section: Resultsmentioning

confidence: 99%

Section: Evaluation Of the Healing Efficiencymentioning

confidence: 99%

Novel epoxy/cyclic olefin copolymer/carbon structural composites with electro‐activated self‐healing properties

et al. 2023

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“…The outgrowth of the existing literature has been a number of proposals of alternative binder concepts utilizing GP as impregnation materials for temperature-resistant fiber composites and as alternative binders to develop sustainable, fine-grained concrete materials. Compared to cement-based impregnations, the use of GP impregnation combines unique properties and structural characteristics of polymers, ceramics, and cements, allowing a wider processing window for continuous production and rapid setting with high early strength by directed low-temperature synthesis , and even possible chemical bonding at the interfacial region with the CF . The good mechanical response of continuous-fiber GP composites under temperatures ranging above 200 °C has been demonstrated in several earlier investigations, − targeting solely high-tech automotive or aerospace applications.…”

Section: Introductionmentioning

confidence: 99%

Temperature-Dependent Pullout Behavior of Geopolymer Concrete Reinforced with Polymer- or Mineral-Impregnated Carbon Fiber Composites: An Experimental and Numerical Study

Zhao

Liebscher

et al. 2023

ACS Sustainable Chem. Eng.

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Despite significant advantages, large-scale use of carbon-reinforced concrete has been hitherto limited due to insufficient thermal resistance and chemical compatibility with cementitious materials. In this regard, mineral-impregnated carbon fibers (MCFs) made with a geopolymer (GP) are a promising, novel reinforcement for GP concrete, making cement-free, lightweight, fireproof, and durable structures. This paper is envisaged to study the temperature-dependent pullout behavior of MCFs in GP concrete and for a comparison with a commercial, epoxy-impregnated product. The experimental results showed comparable load-transferring capacity and post-crack behavior at ambient temperature but better bonding quality at elevated temperatures for MCFs. These were explained by the material structures, failure patterns, and thermal behavior of the yarns and GP concrete, as characterized by micro-tomography, microscopy, thermogravimetric analysis, and mercury intrusion porosimetry. Finally, a three-dimensional, finite element model was used to simulate and predict the pull-out process through a combined discrete cohesive zone model and smeared phase-field method in a representative crack element framework. With proper parametric calibrations, evident agreement between numerical and experimental results was gained.

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“…Hence, more temperature stable materials, such as fine reactive pozzolanic particles [19][20][21], have been investigated to enhance the fiber-matrix interphase. A very promising approach in overcoming this temperature issue lies in utilizing impregnation matrices based on inorganic mineral binders, such as cement or aluminosilicates, to fabricate so-called mineral-impregnated carbon fibers (MCFs), which exhibit significantly higher temperature resistance, ensuring sufficient load-bearing capacity up to 500 • C [17,18,22] and comparable tensile properties to conventional CFRPs [23][24][25]. Moreover, this novel Fibers 2022, 10, 42 2 of 18 reinforcement type MCF brings several further advantages, namely, their low material cost, better compatibility with cementitious materials, flexibility in shape, automated manufacture [24], and possibilities for their direct integration into emerging 3D printing processes [26].…”

Section: Introductionmentioning

confidence: 99%

Influence of Roller Configuration on the Fiber–Matrix Distribution and Mechanical Properties of Continuously Produced, Mineral-Impregnated Carbon Fibers (MCFs)

Liebscher

Zhao

Wilms

et al. 2022

Fibers

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The article at hand is envisaged to enumerate significant technological parameters for the successful impregnation of carbon fiber rovings having 50,000 (50 K) filaments, each within a fine-grained, cementitious suspension. Parameters such as the number of rollers as well as the influence of roller deflection and rotation have been investigated and discussed with regard to the quality of the related impregnation and mechanical properties resulting therefrom. Morphological analysis disclosed distinct differences in the fiber matrix distribution, which are particularly reflected in the flexural performance of the mineral-impregnated carbon fibers (MCFs) produced. Moreover, with the best fiber matrix distribution, uniaxial tensile tests on MCFs demonstrated superior tensile strengths, moduli of elasticity, and elongations at rupture.

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Joule heating as a smart approach in enhancing early strength development of mineral-impregnated carbon-fibre composites (MCF) made with geopolymer

Cited by 23 publications

References 58 publications

Novel epoxy/cyclic olefin copolymer/carbon structural composites with electro‐activated self‐healing properties

Novel epoxy/cyclic olefin copolymer/carbon structural composites with electro‐activated self‐healing properties

Temperature-Dependent Pullout Behavior of Geopolymer Concrete Reinforced with Polymer- or Mineral-Impregnated Carbon Fiber Composites: An Experimental and Numerical Study

Influence of Roller Configuration on the Fiber–Matrix Distribution and Mechanical Properties of Continuously Produced, Mineral-Impregnated Carbon Fibers (MCFs)

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