Effect of Elevated Temperature on the Microstructure of Metakaolin-Based Geopolymer

Adjei, Stephen; Elkatatny, Salaheldin; Ayrancı, Korhan

doi:10.1021/acsomega.1c06878

Cited by 12 publications

(2 citation statements)

References 67 publications

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“…After heating plain KGP without additives to 900 °C a series of crystalline peaks appeared in an XRD analysis [31]. Microcracks formed during geopolymer matrix dehydration/densification were filled by molten glassy phase as indicated by little-to-no open porosity in the heated samples as expected [31,50]. Figure 4 shows how the glass phase filled much larger cracks after heat treatment.…”

Section: Effect Of Initial Heat Treatmentmentioning

confidence: 74%

Self-Healing Glass/Metakaolin-Based Geopolymer Composite Exposed to Molten Sodium Chloride and Potassium Chloride

Keane

Jacob

Belusko³

et al. 2023

Applied Sciences

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Geopolymers (GP) are a class of X-ray amorphous, nanoporous, nanoparticulate materials that can be mixed, poured, and cured under ambient conditions. Typically, geopolymers are made using a Group 1 (G1) alkali activator such as sodium or potassium metasilicate and an aluminosilicate precursor. An analogous material to GPs is ordinary Portland cement because of the similarities in processing, however, the resulting microstructure is more similar to that of a glass. Geopolymers are more thermally stable than OPC and can therefore be used in a variety of thermal energy storage systems, as energy storage is an increasing global concern. In this study, potassium metakaolin-based geopolymer composites containing glass particles and alumina platelets were manufactured, heated in air, and exposed to molten sodium chloride or potassium chloride under an air atmosphere. Results showed the formation of an amorphous self-healing geopolymer composite (ASH-G) that could contain molten G1 chlorides for over 200 h without signs of macro or microscopic chemical degradation. The filling of cracks by glass particles in the composite after heating to 850 °C makes this material self-healing. It was found that the morphology of ASH-G composites was more affected by temperature and duration than contact with corrosive molten chlorides in air. Future works include investigating the effect of molten salt on mechanical properties during initial heating, after prolonged heating, and the material compatibility with other molten Group 1 chloride eutectics.

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Section: Effect Of Initial Heat Treatmentmentioning

confidence: 74%

Self-Healing Glass/Metakaolin-Based Geopolymer Composite Exposed to Molten Sodium Chloride and Potassium Chloride

Keane

Jacob

Belusko³

et al. 2023

Applied Sciences

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“…Many researchers have used aluminum-silicon-rich solid waste to make geopolymer, which is a new type of green gelling material. Its main raw material can be aluminosilicate minerals occurring in nature, or it can be made from solid industrial waste with a high aluminum-silicon content [2][3][4]. Studies have shown that blast furnace slag [5], zeolite [6], metakaolin [7], fly ash [8], red mud [9], and other synthetic geopolymers have many advantages, such as high strength, low toxicity substance leaching rates, good durability, etc.…”

Section: Introductionmentioning

confidence: 99%

Solidification Experiment of Lithium-Slag and Fine-Tailings Based Geopolymers

Dai¹,

Zeng²,

et al. 2023

Sustainability

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Based on the pressure of environmental protection, more and more scientific researchers are trying to reuse aluminum–silicon-rich industrial wastes. In this study, activated lithium-slag and lead–zinc tailings were used as raw materials to prepare geopolymers at ratios of 3:7, 1:1, and 7:3. These geopolymers were initially cured for 12 h at 25 °C, 50 °C, 75 °C, and 100 °C and were then cured at room temperature to the specified ages. The compressive strength of each group of geopolymers was tested at the ages of 3 days, 7 days, and 28 days. The optimal group of samples was selected, that is, those with a ratio of lithium-slag to lead–zinc tailings of 7:3 and an initial curing temperature of 75 °C. After that, the heavy metal leaching test and porosity analysis test were carried out on the optimal group of samples, and the curing effect was considered to meet the requirements of the Chinese specifications. In addition, in order to reveal the mechanism of the chemical reaction, scanning electron microscopy and X-ray diffraction (XRD) were used to study the microstructure and hydration products of the C3 group cured samples. This study provides a new concept for the reuse of industrial wastes such as lithium-slag and fine-tailings.

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Biodiesel Synthesis Using Magnetizable Geopolymer as Heterogeneous Catalysts Nanocomposite Assisted by Artificial Intelligence

Brandão,

de Souza,

Maranhão

et al. 2024

Top Catal

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Effect of Elevated Temperature on the Microstructure of Metakaolin-Based Geopolymer

Cited by 12 publications

References 67 publications

Self-Healing Glass/Metakaolin-Based Geopolymer Composite Exposed to Molten Sodium Chloride and Potassium Chloride

Self-Healing Glass/Metakaolin-Based Geopolymer Composite Exposed to Molten Sodium Chloride and Potassium Chloride

Solidification Experiment of Lithium-Slag and Fine-Tailings Based Geopolymers

Biodiesel Synthesis Using Magnetizable Geopolymer as Heterogeneous Catalysts Nanocomposite Assisted by Artificial Intelligence

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