Influencia de la concentración de NaOH, sobre la resistencia a compresión de morteros con reemplazos de escorias de fundición
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Date
2024-04
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Universidad Nacional de Trujillo
Abstract
La presente investigación tuvo como objetivo determinar la influencia de la concentración de NaOH, sobre la resistencia a compresión de morteros con reemplazos de escorias de fundición. De igual forma se realizó una caracterización fisicoquímica como: densidad aparente, porosidad superficial y grupos funcionales, de tal manera poder dar un valor agregado a los residuos de escorias de fundición de mineral aurífero mediante una geopolimerización con distintas concentraciones de NaOH. En esta investigación se aplicó una metodología explicativa, aplicada, y cuantitativa, a través de un diseño experimental unifactorial. La muestra de la investigación consistió en conformar 40 morteros de relación a/c 0.55, con relación conglomerante/agregado 1/3 (v/v) y relación de cemento y escorias de fundición de mineral aurífero (1:1 v/v). Las escorias de fundición fueron de granulometría pasante por malla Nº200; las cuales fueron activadas con NaOH en concentraciones de 2M, 4M, 6M y 8M. Estos morteros fueron sometidos a caracterización mecánica mediante la norma ASTM C109 para resistencia a la compresión en edades de 7 y 28 días. Asimismo, fueron sometidos a caracterización fisicoquímica como; densidad aparente a través de sus dimensiones, porosidad superficial a través de microscopia óptica y grupos funcionales a través de espectros FTIR. Como resultados se obtuvieron que a medida que la concentración de la solución alcalina de NaOH aumenta en el mortero, la resistencia a la compresión aumenta. Se obtuvo una resistencia a la compresión máxima de 27.76 MPa para el nivel 8M en morteros de cemento con reemplazo de escorias de fundición de mineral aurífero.
The present investigation focused on determining the influence of NaOH concentration on the compressive strength of mortars with foundry slag replacements. Likewise, a physicochemical characterization was carried out such as: apparent density, surface porosity and functional groups, in order to give added value to the waste smelting slag of gold ore through geopolymerization with different concentrations of NaOH. This research presented an explanatory, applied, and quantitative methodology, presenting a unifactorial experimental design. The research sample consisted of forming 40 mortars with a w/c ratio of 0.55, with a binder/aggregate ratio of 1/3 (v/v) and a ratio of cement and gold-bearing smelting slag (1:1 v/v). The foundry slags had a granulometry passing through a No 200 mesh; which were activated with NaOH in concentrations of 2M, 4M, 6M and 8M. These mortars were subjected to mechanical characterization using the ASTM C109 standard for compressive strength at ages of 7 and 28 days. Likewise, they were subjected to physicochemical characterization such as; apparent density through its dimensions, surface porosity through optical microscopy and functional groups through FTIR spectra. The results were obtained that as the concentration of the alkaline NaOH solution increases in the mortar, the compressive strength increases in the same way. Achieving a maximum compressive strength of 27.76 MPa for level 8M in cement mortars with replacement of gold ore smelting slag.
The present investigation focused on determining the influence of NaOH concentration on the compressive strength of mortars with foundry slag replacements. Likewise, a physicochemical characterization was carried out such as: apparent density, surface porosity and functional groups, in order to give added value to the waste smelting slag of gold ore through geopolymerization with different concentrations of NaOH. This research presented an explanatory, applied, and quantitative methodology, presenting a unifactorial experimental design. The research sample consisted of forming 40 mortars with a w/c ratio of 0.55, with a binder/aggregate ratio of 1/3 (v/v) and a ratio of cement and gold-bearing smelting slag (1:1 v/v). The foundry slags had a granulometry passing through a No 200 mesh; which were activated with NaOH in concentrations of 2M, 4M, 6M and 8M. These mortars were subjected to mechanical characterization using the ASTM C109 standard for compressive strength at ages of 7 and 28 days. Likewise, they were subjected to physicochemical characterization such as; apparent density through its dimensions, surface porosity through optical microscopy and functional groups through FTIR spectra. The results were obtained that as the concentration of the alkaline NaOH solution increases in the mortar, the compressive strength increases in the same way. Achieving a maximum compressive strength of 27.76 MPa for level 8M in cement mortars with replacement of gold ore smelting slag.
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TECHNOLOGY::Chemical engineering::Metallurgical process and manufacturing engineering::Metallurgical manufacturing engineering