Keywords
Geopolymers
metakaolin
rice husk ash
silica fume
leucite. Geopolímeros
metacaolín
ceniza de cascarilla de arroz
humo de sílice
leucita.
metakaolin
rice husk ash
silica fume
leucite. Geopolímeros
metacaolín
ceniza de cascarilla de arroz
humo de sílice
leucita.
How to Cite
Villaquirán, M. A., Rodríguez, E., & Mejía de Gutiérrez, R. (2014). Thermal assessment of metakaolin-based geopolymer systems produced with silica fume and rice husk ash. Informador Tecnico, 78(1), 6–11. https://doi.org/10.23850/22565035.64
Abstract
The effect of exposing metakaolin-based geopolymers to a temperature of 1200 °C was assessed using as alkaline activator a mixture of potassium hydroxide with different sources of silica: a commercial potassium silicate (PS), rice husk ash (RHA), and silica fume (SF). The amounts of metakaolin and activator in the mixture were adjusted to obtain molar ratios of 2.5 for SiO2/Al2O3 and 0,28 for K2O/SiO2. The substitution of 50% PS with RHA and SF was also studied, and the resistance to compression after exposing the mixture to different temperatures between 300 and 1200 °C was assessed. The respective physical analyses, such as determination of volumetric changes, were performed, and the study was complemented with a microstructural analysis conducted by X-ray diffraction and electron microscopy. At room temperature, the geopolymers presented mechanical strengths ranging between ~30 and ~36 MPa. At 1200 °C, materials originally amorphous were transformed into crystalline-type structures, specifically leucite and kalsilite. The best thermo-mechanical performance of the geopolymers was achieved by replacing 50% PS with CCA, which when exposed to 1200 °C retains 44% of its mechanical strength as compared with 26% retained by the reference material.
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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Copyright (c) 2019 Servicio Nacional de Aprendizaje (SENA)
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