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Johanna Mejía

Erich D. Rodríguez

Ruby Mejía de Gutiérrez

Abstract

This article presents the synthesis of a geopolymeric materialbased on a Colombian fly ash (FA). Geopolymers withdifferent total molar SiO2/Al2O3 and Na2O/SiO2 ratios andthe inclusion of two source of calcium (a national granulatedblast furnace slag and ordinary Portland cement) wereevaluated. The reaction kinetic of FA alkali activationwas monitored by isothermal calorimetry, which showsthe systems with highest alkalinity exhibit higher releaseof heat and higher dissolution degree of FA. Replacinga percentage of FA by a calcium source (OPC or GBFS)modifies the kinetic and reaction products. A higher SiO2/Al2O3 molar ratio leads to the production of materials withhigher compressive strength up to ~ 77 %. Overall, theaddition of a calcium source contributes significantly to theacquisition of a higher mechanical performance. The resultsshow the potential use of this FA with unprofitable physicaland chemical characteristics as a raw material to producenon-conventional cementitious with compressive strengthup to 50 MPa at 28 days of curing time.

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Keywords

Geopolymers, fly ash, granulated blast furnace slag, isothermal calorimetry, unconventional cements

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How to Cite
Mejía, J., Rodríguez, E., & Mejía de Gutiérrez, R. (2014). Potential utilization of a low quality-fly ash as an aluminosilicate source in the production of geopolymers. Ingenieria Y Universidad, 18(2), 309 - 328. https://doi.org/10.11144/Javeriana.IYU18-2.upcv
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