Alkali-Activated Binder Based on Milled Antigorite

Калинкина, Е. В.; Гуревич, Б. И.; Калинкин, А. М.

doi:10.3390/min8110503

Cited by 17 publications

(5 citation statements)

References 37 publications

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“…MA was carried out batchwise for periods of time ranging from 30 s to 400 s. For preparation of the geopolymers, FA + calcite mixtures milled for 30 s, 180 s, and 400 s were used. The parameters of MA were chosen based on previous work with the planetary mill [67,68]. In this paper, the terms "mechanical activation" ("MA") and "milling" refer to the same process of mechanical treatment using a planetary mill.…”

Section: Mechanical Activationmentioning

confidence: 99%

Synthesis of Fly Ash-Based Geopolymers: Effect of Calcite Addition and Mechanical Activation

et al. 2020

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Blends of fly ash and natural calcite, mechanically activated for 0–400 s in a planetary mill, were used to synthesize geopolymers at ambient temperature. The calcite content in the blends was 0–10 wt.%. Sodium hydroxide solution was used as an alkaline agent. Mechanical activation of the raw material considerably enhanced its reactivity with respect to the alkaline agent, as was observed using Fourier-transform infrared spectroscopy, isothermal conduction calorimetry, thermogravimetry coupled with mass spectrometry analysis of the evolved gas, and SEM/EDS. The addition of calcite to the fly ash improved the compressive strength of the geopolymers, especially during the early age of curing. For 7 d aged geopolymers based on the 90% fly ash + 10% calcite blend, the strength was 8.0-, 3.5- and 2.9-fold higher than that for the geopolymers based on the unblended fly ash for 30 s, 180 s and 400 s mechanical activation time, respectively. Using Mössbauer spectroscopy, it was revealed that iron present in the fly ash did not play a significant part in the geopolymerization process. The dominant reaction product was sodium containing aluminosilicate hydrogel (N-A-S-H gel). Calcite was found to transform, to a small extent, to vaterite and Ca(OH)2 in the course of the geopolymerization.

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Section: Mechanical Activationmentioning

confidence: 99%

Synthesis of Fly Ash-Based Geopolymers: Effect of Calcite Addition and Mechanical Activation

et al. 2020

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“…The impact of different parameters involved in geopolymer production on UCS has been reported by various authors. This includes the effect of precursor type and ratio [ 30 , 33 , 44 , 45 , 82 , 110 ], calcination [ 76 , 99 , 100 , 102 , 103 ], activator blends [ 22 , 31 , 63 , 75 , 111 ], liquid to solid ratio [ 36 , 37 , 42 , 112 ], Si/Al and Na/Al [ 91 , 113 , 114 ], and curing conditions [ 74 , 106 , 115 ]. For geopolymerization, Si/Al lower than 3 is suggested since higher ratios would create linear structures rather than a 3D structure.…”

Section: Mechanical and Chemical Propertiesmentioning

confidence: 99%

Quarry Waste as Precursors in Geopolymers for Civil Engineering Applications: A Decade in Review

Solouki

Viscomi²,

Lamperti³

et al. 2020

Materials

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Carbon footprint reduction of paving materials could be explored through recycling mining by-products into different applications, which will preserve natural resources and decrease environmental issues. One possible approach is to reuse quarry dust and mining ore waste as precursors in geopolymer applications. geopolymers are mineral polymers rich in aluminosilicates with an amorphous to a semi-crystalline three-dimensional structure. The current review aims to summarize the studies conducted during the past decade on geopolymers containing quarry dust and mine tailings. The first section discusses various precursors used for geopolymer cement production such as metakaolin, ground granulated blast furnace slag (GGBFS), fly ash, and quarry/mining ore wastes including silt, tungsten, vanadium, copper, gold, zinc, marble, iron, basalt, and lithium. Different calcination treatments and curing conditions have been summarized. In some cases, the precursors are required to be calcined to increase their reactivity. Both ambient temperature and elevated temperature curing conditions have been summarized. Less attention has been paid to room temperature curing, which is necessary for field and industrial implementations. Engineering properties such as compressive strength, density, durability and acid resistance, water absorption and abrasion of geopolymers containing mining waste were reviewed. One of the main barriers preventing the widespread use of waste powders, in addition to economic aspects, in geopolymers could be due to their unstable chemical structure. This was shown through extensive leachate of Na+ or K+ cations in geopolymer structures. The review of over 100 articles indicated the need for further research on different aspects of quarry waste geopolymer productions before its full industrial implementation.

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“…According to that study, the process of dehydroxylation was evidently linked to the generation of a greater amount of amorphous material during the milling process. Furthermore, there was a notable increase in the solubility of silicon [131].…”

Section: Mechanical Activationmentioning

confidence: 99%

A Comprehensive Review on Mine Tailings as a Raw Material in the Alkali Activation Process

Manaviparast,

Miranda,

Pereira

et al. 2024

Applied Sciences

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The mining industry generates vast quantities of mine tailings on an annual basis. However, due to their limited economic value, a significant portion of these tailings are deposited close to mining sites, often underwater. The principal environmental apprehensions associated with mine tailings revolve around their elevated levels of heavy metals and sulfidic minerals. The oxidation of these sulfidic minerals can lead to the formation of acid mine drainage, which in turn releases heavy metals into nearby water systems. The effective management of tailing dams requires substantial financial investments for their construction and meticulous control. Consequently, a pressing need exists for stable, sustainable, and economically viable management approaches. One promising method for addressing mine tailings is through alkali activation, a technique that serves as a stabilization process. This approach yields robust, concrete-like structures by utilizing raw materials abundant in aluminum and silicon, which conveniently constitute the primary components of mining residues. This comprehensive review outlines the research on utilizing alkali activation for mine tailings. It delves into the reactivity and chemical attributes of diverse minerals. Numerous mine tailings exhibit an inadequate level of reactivity under alkaline conditions, so various pre-treatment methodologies and their impacts on mineralogy are meticulously explored.

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Alkali-Activated Binder Based on Milled Antigorite

Cited by 17 publications

References 37 publications

Synthesis of Fly Ash-Based Geopolymers: Effect of Calcite Addition and Mechanical Activation

Synthesis of Fly Ash-Based Geopolymers: Effect of Calcite Addition and Mechanical Activation

Quarry Waste as Precursors in Geopolymers for Civil Engineering Applications: A Decade in Review

A Comprehensive Review on Mine Tailings as a Raw Material in the Alkali Activation Process

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