Development of construction mortars with geopolymers obtained from soils degraded by mining in Bajo Cauca Antioquia
Published 2023-06-17
Keywords
- geopolymer,
- alkaline activator,
- mortars,
- degraded soils,
- mining waste
- fly ash ...More
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Copyright (c) 2023 Revista UIS Ingenierías
This work is licensed under a Creative Commons Attribution-NoDerivatives 4.0 International License.
Abstract
In the present work, mortars with geopolymer were obtained from degraded soils from mining activities as a circular economy process. For this purpose, a granulometric classification of the degraded soil was initially carried out to obtain particles with a size of less than 750 µm, which were used in the mixture as fine aggregates. For the cementitious phase, mixtures of degraded soil with size less than 45 µm (obtained through a grinding process of the fine aggregate) and fly ash (with size < 45 µm), alkaline activated, were used. The particle size of the soils was determined by laser diffraction. In addition, a chemical evaluation of the geopolymer precursors was carried out by X-ray fluorescence and scanning electron microscopy was used for the analysis of both the soils and the manufactured geopolymer mortars; density and compressive strength tests were carried out. The results obtained indicate that ground soil particles with a size smaller than 45 µm were obtained in percentages higher than 91.7 %, which presented a high content of aluminosilicates: SiO2 (81.7 % p/p) and Al2O3 (12.51 % p/p). In addition, a morphology of irregular grains and sticks was observed in the mortars with developed geopolymers.
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