Factors Influence on Shrinkage of High Calcium Fly Ash Geopolymer Paste

Kamhangrittirong, Parames; Suwanvitaya, Prasert; Witayakul, Watcharin; Suwanvitaya, Patcharaporn; Chindaprasirt, Prinya

doi:10.4028/www.scientific.net/amr.610-613.2275

Cited by 10 publications

(9 citation statements)

References 18 publications

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“…Así mismo, es posible observar otro tipo de partículas de diferente morfología, las cuales pueden atribuirse a las fuentes de Ca sin reaccionar. En términos generales, en las micrografías es posible observar la aparición de microgrietas generadas tanto por la retracción del material, lo cual es característico en sistemas geopoliméricos con relaciones SiO 2 /Al 2 O 3 elevadas (Kamhangrittirong et al, 2013), como por el preacondicionamiento de las muestras antes de la realización del ensayo. …”

Section: Microscopia Electrónica De Barridounclassified

Utilización potencial de una ceniza volante de baja calidad como fuente de aluminosilicatos en la producción de geopolímeros

Mejía

Rodríguez

Gutiérrez

2014

IyU

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Cómo citar este artículo: MEJÍA J. M.; RODRÍGUEZ, E. D. y MEJÍA DE GUTIÉRREZ, R. Utilización potencial de una ceniza volante de baja calidad como fuente de aluminosilicatos en la producción de geopolimeros. Ingeniería y Universidad. 2014, vol. 18, no. 2, pp. 309-327. http ResumenEste artículo presenta la síntesis de materiales geopolimé-ricos a partir de una ceniza volante de origen colombiano (FA). Se evaluaron diferentes condiciones de activación de esta ceniza mediante el ajuste de los módulos totales de SiO 2 /Al 2 O 3 y Na 2 O/SiO 2 , así como el efecto de la incorporación de dos fuentes de calcio: una escoria granulada de alto horno (GBFS) y un cemento Portland tipo I (OPC). La cinética de las reacciones desarrolladas después de la activación alcalina de la FA se evaluó realizando una calorimetría isotérmica, según la cual los sistemas de mayor alcalinidad exhiben una mayor liberación de calor y un mayor grado de disolución de la fuente primaria. La incorporación de la fuente de calcio modifica la cinética de reacción y el tipo y características de los productos formados tras la activación. El incremento en la relación molar SiO 2 / Al 2 O 3 del sistema condujo a obtener materiales con una resistencia a la compresión superior hasta en ~77 %. En términos generales, la incorporación de una fuente de calcio al sistema contribuye a la adquisición de un mejor desempeño mecánico en todas las edades de curado en estudio. Los resultados evidencian el potencial aprovechamiento de esta FA para producir cementos no convencionales con resistencias a 28 días de curado superiores a los 50 MPa. Palabras claveGeopolímeros; ceniza volante; escoria granulada de alto horno; calorimetría; cementos no convencionales AbstractThis article presents the synthesis of a geopolymeric material based on a Colombian fly ash (FA). Geopolymers with different total molar SiO 2 /Al 2 O 3 and Na 2 O/SiO 2 ratios and the inclusion of two source of calcium (a national granulated blast furnace slag and ordinary Portland cement) were evaluated. The reaction kinetic of FA alkali activation was monitored by isothermal calorimetry, which shows the systems with highest alkalinity exhibit higher release of heat and higher dissolution degree of FA. Replacing a percentage of FA by a calcium source (OPC or GBFS) modifies the kinetic and reaction products. A higher SiO 2 / Al 2 O 3 molar ratio leads to the production of materials with higher compressive strength up to ~ 77 %. Overall, the addition of a calcium source contributes significantly to the acquisition of a higher mechanical performance. The results show the potential use of this FA with unprofitable physical and chemical characteristics as a raw material to produce non-conventional cementitious with compressive strength up to 50 MPa at 28 days of curing time. KeywordsGeopolymers; fly ash; granulated blast furnace slag; isothermal calorimetry; unconventional cements 311 Utilización potencial de una ceniza volante de baja calidad como fuente de aluminosilicatos en la producción de geopolimeros ...

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Section: Microscopia Electrónica De Barridounclassified

Utilización potencial de una ceniza volante de baja calidad como fuente de aluminosilicatos en la producción de geopolímeros

Mejía

Rodríguez

Gutiérrez

2014

IyU

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“…The appearance of these two gels is indicative of the formation of the geopolymer [26]. These products, in general, have a positive effect on the mechanical strength of the material [32,33]. The geopolymers have a denser structure as larger amounts of biomass bottom ash are added, according to the bulk density data.…”

Section: Compressive Strength Of Mk-opba Geopolymersmentioning

confidence: 98%

Effect of Olive-Pine Bottom Ash on Properties of Geopolymers Based on Metakaolin

et al. 2020

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In this research, the feasibility of using bottom ashes generated by the combustion of biomass (olive pruning and pine pruning) as a source of aluminosilicates (OPBA) has been studied, replacing the metakaolin precursor (MK) in different proportions (0, 25, 50, 75, and 100 wt.% substitution) for the synthesis of geopolymers. As alkaline activator an 8 M NaOH solution and a Na2SiO3 have been used. The geopolymers were cured 24 h in a climatic chamber at 60 °C in a water-saturated atmosphere, subsequently demoulded and cured at room temperature for 28 days. The results indicated that the incorporation of OPBA waste, which have 19.7 wt.% of Ca, modifies the characteristics of the products formed after alkaline activation. In general terms, the incorporation of increasing amounts of calcium-rich ashes results in geopolymers with higher bulk density. The compressive strength increases with the addition of up to 50 wt.% of OPBA with respect to the control geopolymers, contributing the composition of the residue to the acquisition of better mechanical behavior. The results indicate the potential use of these OPBA waste as raw material to produce unconventional cements with 28-day curing strengths greater than 10 MPa, and thermal conductivities less than 0.35 W/mK.

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“…Furthermore, the porosity of the produced geopolymer concrete depends mainly on the degree of fineness of the used aluminosilicate [26]. Another study by Kamhangrittirong et al depicts that the increase in the compressive strength of FA-based geopolymer concrete is mainly affected by the ratio of silica to alumina [27]. GGBS comes second after FA as an aluminosilicate that is used in the production of geopolymer concrete.…”

Section: Aluminosilicatesmentioning

confidence: 99%

Development Factors in Eco-Friendly Geopolymer Concrete - A State of the Art Review

Elkafrawy

Elsayed

Meleka

2022

ERJ. Engineering Research Journal

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The use of natural resources in different fields increases over time. Governments all over the world encourage all officials to achieve sustainability goals. Therefore, scientists developed geopolymer concrete as an alternative to ordinary cement-based concrete. The production process of one ton of cement is accompanied by emitting approximately one ton of carbon dioxide into the environment. Geopolymer concrete is free of cement and based on by-product materials, which increase the sustainability of structures.Consequently, it has considerable potential to become the future of green building materials due to its advantages in terms of mechanical properties and environmental benefits compared to conventional cementbased concrete. This paper summarizes a review of the development factors of geopolymer concrete and its applications. Moreover, it briefly exhibits the advantages and disadvantages of replacing Ordinary Portland Cement (OPC) concrete with newly developed geopolymer concrete. In addition, it reports a review of the mix design of geopolymer concrete. Furthermore, it helps the reader better understand the properties of fresh and hardened geopolymer concrete. It also outlines and concludes the effect of different components on binder properties through proposed flow charts. Several research studies on different structural elements made of geopolymer concrete are also presented and discussed. Finally, it provides some practical applications for using geopolymer concrete in construction.

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Factors Influence on Shrinkage of High Calcium Fly Ash Geopolymer Paste

Cited by 10 publications

References 18 publications

Utilización potencial de una ceniza volante de baja calidad como fuente de aluminosilicatos en la producción de geopolímeros

Utilización potencial de una ceniza volante de baja calidad como fuente de aluminosilicatos en la producción de geopolímeros

Effect of Olive-Pine Bottom Ash on Properties of Geopolymers Based on Metakaolin

Development Factors in Eco-Friendly Geopolymer Concrete - A State of the Art Review

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