Reaction, structure and properties of eco-friendly geopolymer cement derived from mechanically activated pumice

Szabó, Roland; Kristály, Ferenc; Nagy, Sándor; Singla, Rashmi; Mucsi, Gábor

doi:10.1016/j.ceramint.2022.10.204

Cited by 15 publications

(7 citation statements)

References 42 publications

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“…The characterization of the starting material, in particular the particle size, has important effects on the mechanical and microstructure properties of the final material. [41][42] In this context, first of all, a detailed characterization of the pumice collected from the field was carried out to determine its suitability for geopolymerization.…”

Section: Resultsmentioning

confidence: 99%

“…36 However, its reactivity or dissolution capacity in an alkali medium is lower than that of metakaolin, fly ash or ground granulated blast furnace slag (GGBS). 37 Efforts by some researchers have been spent to enhance the alkali activation of pumice from different districts together with solid reactive additions, such as metakaolin, 38 cement, 39 alumina, 27 nano and micro silica, 40 grinding fineness, 41,42 alkaline and/or heat calcination. 43,44 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 suit-able Si/Al ratio.…”

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: Introductionmentioning

confidence: 99%

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

View full text Add to dashboard Cite

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“…It has been proven that calcined materials, like ground granulated blast furnace slag (GGBS), fly ash and metakaolin (which are mainly amorphous) has higher reactivity during geopolymerization reaction unlike uncalcined materials. In geopolymers, the reactivity of raw material depends on its particle size [37][38], glass content and glass composition [39].…”

Section: Geopolymermentioning

confidence: 99%

Preliminary Study of Low-Grade Clays as Secondary Raw Material for Geopolymer

Abd Bakil,

Kristály,

Mucsi

2023

Geosciences and Engineering

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The aim of this paper is to promote the use of low-grade clay as silicon and aluminum bearing material for geopolymer applications. This study presents definition of low-grade clay, sources and preliminary results of low-grade clay from waste of coal mining (coal gangue) and clay deposit. The results show low-grade clay contain kaolinite and amorphous below 20% with impurities more than 64% that has significant impact in term of reactivity. Thus, the preliminary result provided valuable idea and better understanding of low-grade clay in particular for reuse in geopolymer applications

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“…Research on coal gangue geopolymers is limited, with the majority of geopolymer studies focusing on their application in construction materials such as cement [14,15]. Han et al [16]investigated the mechanism of coal gangue and the effect of activation on the properties of coal gangue geopolymers.…”

Section: Introductionmentioning

confidence: 99%

The influence of NaOH concentration on the strength and microstructure of ceramic binders prepared from coal gangue through geopolymerization

Zhu,

Yu,

Shang

et al. 2024

Mater. Res. Express

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The efficient utilization of coal gangue plays an indispensable role in reducing environmental pressure, improving resource utilization efficiency and promoting green development. As a kind of solid waste rich in silicon and aluminium, coal gangue can be used to prepare ceramic materials. Therefore, a new ceramic preparation process was proposed in this study to prepare ceramic binders for grinding wheels by geopolymerization. The SiO2-B2O3-Al2O3-RO-R2O ceramic binder, a green and low-cost material, was successfully prepared using this method. The effect of the concentration of NaOH on the mechanical properties and microstructure of the ceramic binder was also studied. The strength and microstructure of different ceramic binders were characterized by XRD, TG-DTG, SEM-EDS and FT-IR. The results show that the bending strength of the geopolymer ceramic binder increases proportionately with the increase of NaOH concentration. When the concentration of sodium hydroxide is 15M, the bending strength reaches 19MPa. N-A-S-H gel and zeolite formed in the geopolymerization reaction and the pores formed in the sintering process have a significant effect on the bending strength of the ceramic binder. This technology can significantly stimulate the chemical activity of coal gangue and provide innovative ideas for efficient utilization of coal gangue.

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Reaction, structure and properties of eco-friendly geopolymer cement derived from mechanically activated pumice

Cited by 15 publications

References 42 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

Preliminary Study of Low-Grade Clays as Secondary Raw Material for Geopolymer

The influence of NaOH concentration on the strength and microstructure of ceramic binders prepared from coal gangue through geopolymerization

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