Using fly ash to partially substitute metakaolin in geopolymer synthesis

Zhang, Zuhua; Wang, Hao; Zhu, Yingcan; Reid, Andrew; Provis, John L.; Bullen, F

doi:10.1016/j.clay.2013.12.025

Cited by 159 publications

(69 citation statements)

References 36 publications

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“…The results indicated that, during incorporation of the waste catalyst, the optimal replacement level was 10%. This was consistent with the results of Zhang, who used fly ash to partially replace metakaolin in the synthesis of geopolymers [42]. structure.…”

Section: Porosity Of the Wcmbgssupporting

confidence: 92%

The effects of SiO2/Na2O molar ratio on the characteristics of alkali-activated waste catalyst–metakaolin based geopolymers

Cheng

Lin

Cui

et al. 2015

Construction and Building Materials

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Section: Porosity Of the Wcmbgssupporting

confidence: 92%

The effects of SiO2/Na2O molar ratio on the characteristics of alkali-activated waste catalyst–metakaolin based geopolymers

Cheng

Lin

Cui

et al. 2015

Construction and Building Materials

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“…In addition, residues from the agroindustry are being researched in alkaliactivated binders, such as rice husk ash [16]. Recently, interesting studies have been carried out on binary systems (the presence of two aluminosilicate sources in the mixture as mineral precursors) to improve the mechanical properties of a single-precursor binder; good cementing materials have been produced from these mixtures [17][18][19]. In this context, this study investigated a binary system consisting of fly ash/sugarcane bagasse ash (FA/SCBA) as an aluminosilicate source for alkali-activated binder production.…”

Section: Introductionmentioning

confidence: 99%

Study of the binary system fly ash/sugarcane bagasse ash (FA/SCBA) in SiO2/K2O alkali-activated binders

Castaldelli

Moraes

Akasaki

et al. 2016

Fuel

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Due environmental problems related to Portland cement consumption, many studies have been performed to diminish its use. One solution is the development of alkali-activated binders, which can decrease CO 2 emissions and energy consumption by 70% when compared to Portland cement production. In addition, an alkali-activated binder presents mechanical properties similar to Portland cement mixtures, which turns into an interesting material in civil construction. Aluminosilicate-based materials are important raw materials to produce the alkali-activated binders. Therefore, two residues are presented as an aluminosilicate source in this study: fly ash (FA) and sugarcane bagasse ash (SCBA). Both residues were obtained from a combustion process to generate energy, the former from coal and the latter from the bagasse of the sugarcane industry. In addition, the alkaline activating solution is an important factor to achieve improved mechanical properties. In this context, this study investigated the influence of four different SiO 2 /K 2 O molar ratios (0, 0.36, 0.75 and 1.22) in the activating solution with a constant water content, and three FA/SCBA binder proportions (75/25, 50/50 and 25/75). Microstructural characterization was carried out by X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy, mercury intrusion porosimetry, pH and electrical conductivity measurements to study the evolution of the reaction process. The compressive strength of mortars was assessed in order to determine the optimum SiO 2 /K 2 O molar ratio and FA/SCBA ratio. The tests showed that a SiO 2 /K 2 O molar ratio of 0.75 and FA/SCBA proportion of 75/25 provided the best mechanical properties.

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“…e synthesis and chemical composition of geopolymers are similar to those of zeolites, but their microstructure is amorphous to semicrystalline. e aluminosilicate source is usually an industrial mineral, waste, or by-product where silicon and aluminum ions are preferably located in amorphous phases [5][6][7][8][9][10]. Fly ash produced at coal-fired thermal plants has, recently, attracted a lot of research attention on its alkali activation and transformation into cementitious materials (geopolymer) [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Porous Fly Ash‐Based Geopolymers Using Si as Foaming Agent

Kioupis

Kavakakis

Tsivilis

et al. 2018

Advances in Materials Science and Engineering

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is paper concerns the synthesis of foamed geopolymers using fly ash and metallic Si as the binder and the porogent agent, respectively. e Taguchi approach was applied in order to study the effect of some significant synthesis parameters such as the Si foaming agent content (% w/w fly ash based), the alkali type (R : Na or K), and the alkalinity (R/Al molar ratio) of the activation solution on the compressive strength and apparent density of the foamed geopolymers. e final products were characterized by means of XRD, FTIR, and SEM, while optical microscopy was applied for the evaluation of the porosity. Lightweight geopolymers with a compressive strength of 2.08-14.88 ΜPa and an apparent density of 0.84-1.55 g/cm 3 were prepared by introducing a Si content up to 0.2% w/w on fly ash basis.

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Using fly ash to partially substitute metakaolin in geopolymer synthesis

Cited by 159 publications

References 36 publications

The effects of SiO2/Na2O molar ratio on the characteristics of alkali-activated waste catalyst–metakaolin based geopolymers

The effects of SiO2/Na2O molar ratio on the characteristics of alkali-activated waste catalyst–metakaolin based geopolymers

Study of the binary system fly ash/sugarcane bagasse ash (FA/SCBA) in SiO2/K2O alkali-activated binders

Synthesis and Characterization of Porous Fly Ash‐Based Geopolymers Using Si as Foaming Agent

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