Role of carbon fiber in the electrothermal behavior and geopolymerization process of carbon fiber-reinforced FA-GBFS geopolymer composite

Gu, Gonghui; Pei, Yaowen; Ma, Tao; Chen, Feng; Zhang, Jinglin; Xu, Fang

doi:10.1016/j.conbuildmat.2023.130597

Cited by 30 publications

(6 citation statements)

References 41 publications

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“…The deterioration of the mechanical strength compared to the WCF0 sample is therefore noticeable. Gu et al [37] observed that carbon fibers tend to agglomerate in FA-GBBS geopolymer composites when the amount exceeds 0.4 wt.%, inducing strength reduction. The authors found that over this threshold, the paste could not flow through the inside of the agglomerated carbon fibers, thus introducing air within the matrix, which forms porosity.…”

Section: Sem Fractography Analysismentioning

confidence: 99%

Influence of Nanoceramic-Plated Waste Carbon Fibers on Alkali-Activated Mortar Performance

Sambucci,

Al-Noaimat,

Nouri

et al. 2024

Ceramics

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Waste carbon fibers as reinforcing elements in construction materials have recently gained increasing interest from researchers, providing outstanding strength performance and a lower environmental footprint compared to virgin fibers. Combination with cement-free binders, namely alkali-activated materials, is becoming increasingly important for sustainable development in the construction industry. This paper presents results relating to the potential use of waste carbon fibers in alkali-activated mortars. The waste carbon fiber fraction utilized in this research is difficult to integrate as reinforcement in ceramic–cementitious matrices due to its agglomerated form and chemical inertness. For this reason, a nanoceramic coating pretreatment based on nanoclay has been implemented to attempt improvements in terms of deagglomeration, dispersibility, and compatibility with alkali-activated materials. After chemical–physical and microstructural analysis on the nanoclay-plated fibers (including X-ray diffraction, IR spectroscopy, contact angle measurements, and electron microscopy) mortars were produced with four different dosages of treated and untreated waste fibers (0.25 wt.%, 0.5 wt.%, 0.75 wt.%, and 1 wt.%). Mechanical tests and fractographic investigations were then performed. The nanoclay coating interacts compatibly with the waste carbon fibers and increases their degree of hydrophilicity to improve their deagglomeration and dispersion. Compared to the samples incorporating as-received fillers, the addition of nanoclay-coated fibers improved the strength behavior of the mortars, recording a maximum increase in flexural strength of 19% for a fiber content of 0.25 wt.%. This formulation is the only one providing an improvement in mechanical behavior compared to unreinforced mortar. Indeed, as the fibrous reinforcement content increases, the effect of the nanoclay is attenuated by mitigating the improvement in mechanical performance.

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Section: Sem Fractography Analysismentioning

confidence: 99%

Influence of Nanoceramic-Plated Waste Carbon Fibers on Alkali-Activated Mortar Performance

Sambucci,

Al-Noaimat,

Nouri

et al. 2024

Ceramics

View full text Add to dashboard Cite

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“…On the one hand, it provides controlled and efficient heating by adjusting input voltage and material conductivity. [11][12][13] On the other hand, it enhances the durability of geopolymer structures by preventing freeze-thaw damage and reducing the risk of structural cracking and deterioration. [14][15][16] The electrothermal performance of electrically conductive geopolymer is influenced by several factors, including the distribution of electrodes, conductive additives, and the parameter of power supply.…”

Section: Introductionmentioning

confidence: 99%

“…Recent studies have demonstrated advances in the electrothermal performance of geopolymers. Gu et al 11 tested the electrothermal performance of carbon fiber reinforced geopolymer and found that at the carbon fiber content of .4 wt%, the geopolymer showed the significant improvement in its electrothermal performance, as it generated the significant number of internal conductive paths. Cai et al 17 found that the maximum surface temperature of the geopolymer containing carbon black and steel fibers reached 67 • C under electrical heating.…”

Section: Introductionmentioning

confidence: 99%

“…However, it is necessary to take into account the external voltage and the electrothermal cycle, in order to enhance the electrothermal performance of electrically conductive geopolymer. Graphite and carbon fibers have demonstrated their ability to enhance the electrical conductivity of geopolymer, 11,13,20 making the study of the electrothermal properties of graphite and carbon fiber reinforced geopolymers a very promising area of research.…”

Section: Introductionmentioning

confidence: 99%

“…The broad prospects of electrically conductive geopolymer lie in their application in engineering construction and maintenance, producing heat for materials and structures in cold environments. On the one hand, it provides controlled and efficient heating by adjusting input voltage and material conductivity 11–13 . On the other hand, it enhances the durability of geopolymer structures by preventing freeze‐thaw damage and reducing the risk of structural cracking and deterioration 14–16 …”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Electrothermal effect of carbon fiber and graphite reinforced metakaolin‐based geopolymer

Zhang,

Lin,

Chen

et al. 2024

Int J Applied Ceramic Tech

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This paper investigates the influence of carbon fiber and graphite on the cyclic electrothermal performance of geopolymers (inorganic polymers). It was observed that carbon fibers, graphite, and the carbon fiber/graphite composite could form a stable conductive network at low voltage (3 V). However, under high voltages (9 and 12 V), the current of the geopolymer exhibited a peak shape in the first cycle, with higher voltages resulting in larger peak values and decreased conductivity in subsequent cycles. While graphite improved electrical and thermal conductivity, it weakened the microstructure, leading to an increase in microcracks and voids, and a reduction in the strength of geopolymers. The cumulative energy during the electrothermal process was calculated. The failure mechanism of the conductive network in the geopolymer during cyclic electrical heating was explained, highlighting the disruptive effect of gel shrinkage due to water loss on conductive networks.

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Mechanical, microstructural, and thermal characterization of geopolymer composites with nano‐alumina particles and micro steel fibers

Alomayri,

Raza,

Elhadi

et al. 2024

Structural Concrete

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Cement production is responsible for 5%–7% of global CO2 emissions, highlighting the need for sustainable alternatives like geopolymer composite (GCOMP) to meet the growing demand for concrete. This study investigates the mechanical, microstructural, and thermal properties of GCOMP by incorporating nano‐alumina (n‐alumina) and MSF (MSF). The n‐alumina content was varied at 1%, 2%, and 3% by weight of the mix, while the MSF content remained fixed at 0.5% by weight. Thermal characterization was conducted up to 800°C. The performance of GCOMP blends with n‐alumina was compared to a control blend consisting of only 0.5% MSF. Various mechanical properties were evaluated for all GCOMP blends. Microstructural and mineralogical characteristics were analyzed using scanning electron microscopy (SEM), X‐ray diffraction (XRD), and Fourier‐transform infrared spectroscopy (FTIR). Thermogravimetric and differential thermal analysis were performed up to 800°C for the thermal analysis of the GCOMP mix. The results indicate that the optimal mechanical properties were achieved with 2% n‐alumina (compressive and flexural strength increased by 35.65% and 77.7%, respectively). Additionally, the incorporation of n‐alumina improves the interfacial zones and results in a denser structure. GCOMP mortars portrayed a mass loss between 25°C and 250°C, with a marginal mass loss occurring between 250°C and 715°C. No mass loss was observed between 715°C and 800°C. The MSF‐reinforced GCOMP mortars experienced an ultimate mass loss of approximately 12%, with the MSF showing negligible influence. The addition of n‐alumina particles to MSF‐reinforced GCOMP resulted in the development of stronger samples characterized by the presence of C–S–H, calcium aluminate oxide hydroxide, and quartz.

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Role of carbon fiber in the electrothermal behavior and geopolymerization process of carbon fiber-reinforced FA-GBFS geopolymer composite

Cited by 30 publications

References 41 publications

Influence of Nanoceramic-Plated Waste Carbon Fibers on Alkali-Activated Mortar Performance

Influence of Nanoceramic-Plated Waste Carbon Fibers on Alkali-Activated Mortar Performance

Electrothermal effect of carbon fiber and graphite reinforced metakaolin‐based geopolymer

Mechanical, microstructural, and thermal characterization of geopolymer composites with nano‐alumina particles and micro steel fibers

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