Electrothermal effect of alternating current on hardening process of metakaolin-based geopolymer

Zhang, Yajun; Chen, Shikun; Ruan, Shengqian; Wang, Wenxin; Wang, Quanlin; Liu, Yi; Yan, Dongming

doi:10.1016/j.cemconcomp.2023.105205

Cited by 7 publications

(3 citation statements)

References 41 publications

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“…Figure 14 illustrates the impact of alternating cyclic heating on the conductive mechanism of geopolymer. Under the influence of the electric field, pure geopolymer relies primarily on conductive charges, such as OH − , Na + , 54 to move in the pore solution to form the conductive network 55 . However, the pores within the geopolymer are primarily concentrated in the 10–15 nm range (Figure 9), showing a small pore structure.…”

Section: Discussionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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

Zhang,

Lin,

Chen

et al. 2024

Int J Applied Ceramic Tech

Self Cite

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“…In order to analyze the drying weight loss curve of the slag, we can employ the isothermal thermogravimetric analysis (TGA) method. In the field of isothermal and heterogeneous reaction kinetics, the widely used reaction kinetics equation is the Arrhenius equation, − proposed by the Swedish chemist Arrhenius based on thermodynamic principles K = A 0.25em e − E / RT A = frequency factor or pre-exponential factor, s –1 ; E = activation energy, kJ/mol; R = universal gas constant, R = 8.314 J/(mol·K); and T = absolute temperature, K.…”

Section: Methodsmentioning

confidence: 99%

Study on the Drying Kinetics of Zinc Smelting Iron Slag Assisted by Ultrasonic Waves

Cheng,

Dai,

Zhang

et al. 2024

ACS Omega

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This study investigates the impact of ultrasonic treatment on the drying kinetics of zinc smelting iron slag. Through the Arrhenius equation, it was found that the reaction order of zinc smelting iron slag remains constant at 1/2 before and after ultrasonic treatment, indicating a proportional relationship between the reaction rate and the square root of the reactant concentration. Despite the increased drying rate of the iron slag due to ultrasonic pretreatment, the reaction order remains at 1/2. Additionally, it was observed that the drying kinetics of untreated iron slag aligns with the Wang and Singh model, while the drying kinetics of ultrasonically pretreated iron slag fits the Page model. The Page model facilitates the prediction of drying rate and drying time for ultrasonically pretreated iron slag, enabling the optimization of the drying process, enhancing efficiency, and comparing drying performance under different conditions. Using ultrasonic pretreatment, the subsequent drying process of iron slag can significantly shorten the time and save energy. These findings provide essential theoretical foundations for optimizing the drying process of zinc smelting iron slag.

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Alternating current curing of conductive fly ash-slag geopolymer mortars: performance, characterization and optimization

Aygun,

Uysal,

Bilir

et al. 2024

Arch. Civ. Mech. Eng.

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Electrothermal effect of alternating current on hardening process of metakaolin-based geopolymer

Cited by 7 publications

References 41 publications

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

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

Study on the Drying Kinetics of Zinc Smelting Iron Slag Assisted by Ultrasonic Waves

Alternating current curing of conductive fly ash-slag geopolymer mortars: performance, characterization and optimization

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