Alkali activated materials based on fluid catalytic cracking catalyst residue (FCC): Influence of SiO2/Na2O and H2O/FCC ratio on mechanical strength and microstructure

Tashima, Mauro M.; Akasaki, Jorge Luís; Melges, José Luiz Pinheiro; Soriano, Lourdes; Monzó, J.; Payá, J.; Borrachero, M.V.

doi:10.1016/j.fuel.2013.02.052

Cited by 51 publications

(47 citation statements)

References 34 publications

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“…These amorphous phases were transformed during the alkaline activation reaction, and the gels formed showed a shift of the baseline deviation between 23 and 35°. This behavior is typical for the transformation of an amorphous raw material into a gel during the activation process [9,38]. better mechanical properties compared to S1 and S2, whereas, when compared to S4, it presented similar compressive strength with less consumption of potassium silicate.…”

Section: Results For Section 1: Determination Of the Optimum Sio 2 /Kmentioning

confidence: 76%

“…In terms of energy requirements, alkali-activated binders require 70% less when compared to Portland cement [8]. The most interesting aspect of alkali-activated binders is that the aluminosilicate sources that have been researched are usually residues [9,10], whereas one ton of Portland cement requires 2.8 tons of non-renewable raw material (clay and calcium carbonate, among others) [11]. In addition to the environmental advantages, the technological benefits of alkali-activated binders are their high compressive strength and durability, which are similar to or better than the characteristics of Portland cement [12].…”

Section: Introductionmentioning

confidence: 99%

“…Several aluminosilicate sources are being studied to produce alkali-activated binders such as fly ash from thermoelectric power plants [10,13], metakaolin [14], spent fluid catalytic cracking catalysts [9], blastfurnace slag [15] and others. In addition, residues from the agroindustry are being researched in alkaliactivated binders, such as rice husk ash [16].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Results For Section 1: Determination Of the Optimum Sio 2 /Kmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…The production of alternative binders from the alkaline activation of aluminosilicate materials, the so called alkali-activated binders, is a very interesting alternative for reducing the raw materials consumption and the CO 2 emissions [6]. In the last 20 years, there has been an exponential increase in the number of reports, papers and books related to this issue [7].…”

Section: Introductionmentioning

confidence: 99%

Mechanical and durability properties of alkali-activated mortar based on sugarcane bagasse ash and blast furnace slag

Pereira

Akasaki

Melges

et al. 2015

Ceramics International

109

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A. Pereira; Akasaki, JL.; J.L.P.Melges; Mitsuuchi Tashima, M.; Soriano Martinez, L.; Borrachero Rosado, MV.; Monzó Balbuena, JM.... (2015). Effect of sugarcane bagasse ash (SBA) added to alkali-activated blast furnace salg (BFS) AbstractSugarcane bagasse is an agricultural waste which can be transformed, for cementing purposes, into an interesting material by combustion. Specifically, the ash (SBA) obtained by autocombustion was used for preparing alkali-activated cements by blending blast furnace slag (BFS). SBA had a large amount of quartz; however, it reacted in high alkaline medium. Mixtures of BFS/SBA have been used for preparing alkali-activated mortars, by using NaOH (8M solution), sodium silicate (8M solution in Na + and SiO 2 /Na 2 O molar ratio of 0.5) and KOH (8M solution) as activating reagents. Replacements of 25, 33 and 50% of BFS by SBA were carried out and compressive strengths in the range 16-51 MPa were obtained after 90 curing days. Microstructural studies demonstrated that the hydration products formed in the activation of BFS are not significantly affected by the presence of SBA in the mixture. The durability of alkaliactivated mortars was compared to ordinary Portland cement (OPC) mortar in the following media: hydrochloric acid, acetic acid, ammonium chloride, sodium sulphate and magnesium sulphate. The behaviour of alkali-activated mortars with BFS and BFS/SBA was better than that found for plain OPC mortars, especially in ammonium chloride, acetic acid and sodium sulphate media. After 200 days of testing in ammonium chloride solution, the compressive strength loss for Portland cement mortar was about 83.3%. For the same test conditions, alkali-activated mortars presented a maximum reduction of 48.4%. The presence of SBA in alkali-activated BFS mortars did not produce any serious problems in durability. As a general conclusion, sugarcane bagasse ash (SBA) obtained by autocombustion showed good cementing properties as a mineral precursor blended with blast furnace slag (BFS) in alkali-activated systems.

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“…2.a y 2.b): lo que nos indica que se está produciendo una formación progresiva de producto gel. Este comportamiento concuerda con las conclusiones de trabajos previos sobre conglomerantes activados alcalinamente de FCC [15].…”

Section: 1-primera Fase (I) Experimentalunclassified

Nuevos hormigones celulares geopoliméricos aireados con agua oxigenada: síntesis y propiedades

Pérez

Balbuena

Martinez

et al. 2018

Libro De Comunicaciones / Livro Das Comunicações

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RESUMENEl peso propio de las estructuras resulta habitualmente del mismo orden o superior al de las cargas que tienen que soportar, lo que las hace en la mayoría de los casos poco eficientes. La solución radica en la sustitución total o parcial de hormigón tradicional por un material más ligero. El hormigón celular se considera una solución interesante y además sus propiedades aislantes termo-acústicas los hacen mas eficientes desde el punto de vista energético. En este trabajo se presenta una variante del hormigón celular tradicional a favor del medioambiente. Se diseñan hormigones celulares geopoliméricos a partir de la activación alcalina del residuo catalizador gastado de craqueo catalítico (FCC) y la adición de agua oxigenada (H 2 O 2 ). Los materiales resultantes se caracterizan a nivel microestructural y a nivel mecánico. Finalmente se evalúan sus propiedades térmicas y se comparan con las de otros hormigones celulares tradicionales y geopoliméricos. Destaca la obtención de hormigones celulares geopoliméricos de 812 kg/cm 3 y 3.01MPa a partir de dicho precursor FCC aireado con H 2 O 2 . Además, se presenta como un material aislante cuya conductividad térmica se reduce hasta un 50% respecto al material tradicional fabricado a base de cemento Portland (OPC).

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Alkali activated materials based on fluid catalytic cracking catalyst residue (FCC): Influence of SiO2/Na2O and H2O/FCC ratio on mechanical strength and microstructure

Cited by 51 publications

References 34 publications

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

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

Mechanical and durability properties of alkali-activated mortar based on sugarcane bagasse ash and blast furnace slag

Nuevos hormigones celulares geopoliméricos aireados con agua oxigenada: síntesis y propiedades

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