Synthesis of geopolymer with KOH by two kaolinitic clays from the Amazon: Influence of different synthesis parameters on the compressive strength

Barreto, Igor Alexandre Rocha; Costa, Marcondes Lima da

doi:10.1016/j.matchemphys.2022.126330

Cited by 3 publications

(3 citation statements)

References 60 publications

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“…Mechanical strength [9] Fly ash Ground granulated blast furnace slag Hybrid fibers KOH+ K 2 SiO 3 Mechanical properties [34] Table 1. Cont.…”

Section: Kohmentioning

confidence: 99%

“…These activator liquids typically contain sodium and potassium compounds and soluble alkali metals, particularly silicates or hydroxides [6]. The outcome of the activation process is the formation of hydraulic binders that, when mixed with water, can be utilized to create geopolymer binders that exhibit excellent properties, such as temperature resistance [7], durability [8], and mechanical strength [9]. Geopolymersʹ usage presents undeniable economic and ecological advantages, as they use secondary raw materials-notably, substantial quantities of byproducts originating from the energy and metallurgical sectors.…”

Section: Introductionmentioning

confidence: 99%

“…Lee et al studied the setting time and mechanical properties of NaOH-activated fly ash/slagbased geopolymer [20]. Barreto et al studied the mechanical properties of geopolymer synthesized with KOH using kaolinitic clays [9]. Majidi et al studied the mechanical performance of geopolymer mortar developed using ground granulated blast furnace slag and fly ash mixed with potassium silicate [27].…”

Section: Introductionmentioning

confidence: 99%

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Impact of the Fly Ash/Alkaline Activator Ratio on the Microstructure and Dielectric Properties of Fly Ash KOH-Based Geopolymer

Yadav,

Saini,

Kumar

et al. 2024

CivilEng

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Geopolymer materials, alternatives to cement that are synthesized using industrial byproducts, have emerged as some of the leading champion materials due to their environmentally friendly attributes. They can significantly reduce pollution by utilizing a plethora of waste products and conserving natural resources that would otherwise be used in the production of conventional cement. Much work is being carried out to study geopolymers’ characteristics under different conditions. Here, a geopolymer derived from fly ash (FA) was synthesized using a combination of sodium silicate and potassium hydroxide (KOH) (2.5:1 ratio) as an alkali activator (AA) liquid. The FA/AA ratios were optimized, resulting in distinct geopolymer samples with ratios of 1.00, 1.25, 1.50, and 1.75. By adjusting the contribution of alkaline liquid, we investigated the impacts of subtle changes in the FA/AA ratio on the morphology and microstructure using X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) techniques. The FESEM analysis illustrated a mixed matrix and morphology, with the sample with a ratio of 1.00 displaying consistently fused and homogenous morphology. The XRD results revealed the prevalent amorphous nature of geopolymer with a few crystalline phases of quartz, sodalite, hematite, and mullite. An electrical study confirmed the insulating nature of the geopolymer samples. Insulating geopolymers can provide energy-efficient buildings and resistance to fire, hurricanes, and tornadoes. Additionally, using KOH as a part of the alkali activator introduced a less-explored aspect compared to conventional sodium hydroxide-based activators, highlighting the novelty in the synthesis process.

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“…Mechanical strength [9] Fly ash Ground granulated blast furnace slag Hybrid fibers KOH+ K 2 SiO 3 Mechanical properties [34] Table 1. Cont.…”

Section: Kohmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Impact of the Fly Ash/Alkaline Activator Ratio on the Microstructure and Dielectric Properties of Fly Ash KOH-Based Geopolymer

Yadav,

Saini,

Kumar

et al. 2024

CivilEng

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Comparative study of physicochemical properties of geopolymers prepared by four Moroccan natural clays

Ettahiri,

Samuel,

Bouna

et al. 2023

Journal of Building Engineering

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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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Synthesis of geopolymer with KOH by two kaolinitic clays from the Amazon: Influence of different synthesis parameters on the compressive strength

Cited by 3 publications

References 60 publications

Impact of the Fly Ash/Alkaline Activator Ratio on the Microstructure and Dielectric Properties of Fly Ash KOH-Based Geopolymer

Impact of the Fly Ash/Alkaline Activator Ratio on the Microstructure and Dielectric Properties of Fly Ash KOH-Based Geopolymer

Comparative study of physicochemical properties of geopolymers prepared by four Moroccan natural clays

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

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