Study on mechanical properties of kaolin-based geopolymer with various Si/Al ratio and aging time

Gao, Binghuan; Jang, Seongwan; Son, Hyeon-Jin; Lee, Hee Jung; Lee, Hwan Jong; Yang, Jeong Jik; Bae, Chang‐Jun

doi:10.1007/s43207-020-00075-4

Cited by 14 publications

(7 citation statements)

References 15 publications

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“…In this sample, the Si/Al ratio was over the typical geopolymer content (Na 2 O•Al 2 O 3 •4SiO 2 •11H 2 O) and was mostly used for high-temperature composites. 45 Even so, in this study, fumed silica was used because it was a typical component of geopolymer materials, and had a nano-size that could increase the reaction of pumice. At the same time, this composition contained a relatively high molarity of NaOH, which favored the dissolution of Si 4+ and Al 3+ ions from the pumice, which is itself low reactivity increased and the formation of sodium aluminosilicate was enhanced, leading to an increase in flexural and compressive strengths.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 5(B) are probability plots of the compressive strength of the sample containing fumed silica. In this sample, the Si/Al ratio was over the typical geopolymer content (Na 2 O•Al 2 O 3 •4SiO 2 •11H 2 O) and was mostly used for high‐temperature composites 45 . Even so, in this study, fumed silica was used because it was a typical component of geopolymer materials, and had a nano‐size that could increase the reaction of pumice.…”

Section: Resultsmentioning

confidence: 99%

“…The Si/Al ratio, defined from the chemistry of the starting source, has a critical influence on geopolymerization and therefore on the properties of resultant materials. 45 The choice of alkaline solution is another key issue in terms of the aluminosilicate dissolution, especially in the first stage of geopolymerization. NaOH not only has a higher dissolving capacity, but it is also cheaper and more environmentally friendly than KOH.…”

Section: Introductionmentioning

confidence: 99%

“…Among these, the use of additives would be advantageous over other methods in terms of both energy saving and easy modification of the chemical ingredients of the pumice, which differs locally, to the suitable Si/Al ratio. The Si/Al ratio, defined from the chemistry of the starting source, has a critical influence on geopolymerization and therefore on the properties of resultant materials 45 . The choice of alkaline solution is another key issue in terms of the aluminosilicate dissolution, especially in the first stage of geopolymerization.…”

Section: Introductionmentioning

confidence: 99%

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Sustainable activation of pumice with partially variable substitutions of metakaolin and/or fumed silica

Bagci,

Kafkas,

Samuel

et al. 2023

Int J Applied Ceramic Tech

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Sustainable alkali activation of pumice from Turkish origin was studied by a partial replacement of metakaolin and/or fumed silica additives. Following the characterization of as‐received pumice by X‐ray fluorescence spectroscopy, x‐ray diffraction, and nuclear magnetic resonance spectroscopy, a series of powder mixtures were prepared by introducing metakaolin and/or fumed silica (8, 14, and 20 M) into 1 M of the pumice. The mixtures were then dissolved in 11 M NaOH or sodium silicate solutions. The slurries were poured into polyacetal molds to obtain geopolymer samples for mechanical testing and cured in a constant 50°C temperature in a humidity oven for 48 h and then left for 1 week to undergo additional curing at ambient temperature. The microstructural, mechanical, and thermal properties of the final geopolymer samples were determined by XRD, scanning electron microscopy, Weibull analysis of 3‐point flexural and compressive tests and thermal conductivity measurements. Results showed that all the Weibull values were best for 14 M of metakaolin and/or fumed silica. The metakaolin‐added pumice yielded higher compressive strengths of (53.78 ± 33.30 MPa) than fumed silica (10.87 ± 4.04 MPa) and fumed silica plus metakaolin (41.22 ± 5.16 MPa). Thermal conductivities (0.19–0.46 Wm–1K–1) were also comparable to the thermal conductivity of metakaolin‐based geopolymers.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Sustainable activation of pumice with partially variable substitutions of metakaolin and/or fumed silica

Bagci,

Kafkas,

Samuel

et al. 2023

Int J Applied Ceramic Tech

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“…There is a critical alkaline concentration that can achieve the maximum compressive strength, and a higher concentration does not favour the formation of geopolymers, according to prior research that used kaolin as a single source material to synthesise geopolymer products and investigate the effect of different alkaline activator concentrations on the compressive strength [ 22 , 56 , 85 , 86 ]. Important criteria that influence the degree of the geopolymerization process and the reaction duration with the alkali activator, respectively, are the Si-to-Al ratio and the ageing time [ 26 , 63 , 87 ]. Table 4 summarises the utilisation of alkali activator in past studies on kaolin.…”

Section: Factors Affecting the Suitability Of Kaolin Geopolymers In C...mentioning

confidence: 99%

Geopolymer Ceramic Application: A Review on Mix Design, Properties and Reinforcement Enhancement

et al. 2022

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Geopolymers have been intensively explored over the past several decades and considered as green materials and may be synthesised from natural sources and wastes. Global attention has been generated by the use of kaolin and calcined kaolin in the production of ceramics, green cement, and concrete for the construction industry and composite materials. The previous findings on ceramic geopolymer mix design and factors affecting their suitability as green ceramics are reviewed. It has been found that kaolin offers significant benefit for ceramic geopolymer applications, including excellent chemical resistance, good mechanical properties, and good thermal properties that allow it to sinter at a low temperature, 200 °C. The review showed that ceramic geopolymers can be made from kaolin with a low calcination temperature that have similar properties to those made from high calcined temperature. However, the choice of alkali activator and chemical composition should be carefully investigated, especially under normal curing conditions, 27 °C. A comprehensive review of the properties of kaolin ceramic geopolymers is also presented, including compressive strength, chemical composition, morphological, and phase analysis. This review also highlights recent findings on the range of sintering temperature in the ceramic geopolymer field which should be performed between 600 °C and 1200 °C. A brief understanding of kaolin geopolymers with a few types of reinforcement towards property enhancement were covered. To improve toughness, the role of zirconia was highlighted. The addition of zirconia between 10% and 40% in geopolymer materials promises better properties and the mechanism reaction is presented. Findings from the review should be used to identify potential strategies that could develop the performance of the kaolin ceramic geopolymers industry in the electronics industry, cement, and biomedical materials.

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Reusable and Recyclable Industrial Waste in Geopolymer Concrete

Harini

Karthiyaini

Shanmugasundaram

2022

Proceedings of International Conference on Innovative Technologies for Clean and Sustainable Development (ICITCSD – 2021)

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Study on mechanical properties of kaolin-based geopolymer with various Si/Al ratio and aging time

Cited by 14 publications

References 15 publications

Sustainable activation of pumice with partially variable substitutions of metakaolin and/or fumed silica

Sustainable activation of pumice with partially variable substitutions of metakaolin and/or fumed silica

Geopolymer Ceramic Application: A Review on Mix Design, Properties and Reinforcement Enhancement

Reusable and Recyclable Industrial Waste in Geopolymer Concrete

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