Influence of different sources of coal gangue used as aluminosilicate powder on the mechanical properties and microstructure of alkali-activated cement

B. J. Frasson; R. C.A. Pinto; J. C. Rocha

doi:10.3989/mc.2019.12618

Autores/as

B. J. Frasson Civil Engineering Department, ValoRes Waste Materials and Development of Sustainable Materials Laboratory, Federal University of Santa Catarina https://orcid.org/0000-0002-1074-0518
R. C.A. Pinto Civil Engineering Department, ValoRes Waste Materials and Development of Sustainable Materials Laboratory, Federal University of Santa Catarina https://orcid.org/0000-0002-0479-080X
J. C. Rocha Civil Engineering Department, ValoRes Waste Materials and Development of Sustainable Materials Laboratory, Federal University of Santa Catarina https://orcid.org/0000-0003-1074-3230

DOI:

https://doi.org/10.3989/mc.2019.12618

Palabras clave:

Cemento activado alcalinamente, Pasta de cemento, Microestructura, Propiedades mecânicas, Propiedades físicas

Resumen

Los residuos de minería de carbón causan serios problemas ambientales, no obstante, tienen potencial como material de construcción, destacándose los cementos activados alcalinamente. El efecto de los residuos de carbón sobre las propiedades mecánicas y el desarrollo microestructural de los cementos activados alcalinamente son objeto de este estudio. Para ello, se utilizaron las técnicas de DRX, SEM y FTIR. Se produjeron diferentes compuestos activados alcalinamente, utilizando NaOH + Na₂SiO₃ como activador alcalino y curado térmico (50 °C durante 24 h). Los resultados obtenidos a partir del lodo de carbón calcinado mostraron un excelente rendimiento mecánico, con una resistencia a la compresión superior a 60 MPa. Sin embargo, en el caso de los materiales obtenidos a partir de la ganga de carbón calcinada, fue necesaria la adición de metacaolín y cemento Portland para aumentar sus resistencias mecánicas. Asimismo, se evidenció la formación de gel N-A-S-H y la incorporación de iones de hierro en la matriz cementante. El ensayo de velocidad de pulso ultrasónica indicó la polimerización inicial durante el proceso de reacción. Gracias a este se ha comprobado que las diferentes características de los residuos influyen en las propiedades y comportamiento de los correspondientes materiales activados alcalinamente.

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Citas

https://www.iea.org

https://www.worldcoal.org

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