Preparation of shrinkage-free alkali-activated slag material using MgO as both the activator and the expansive agent

P.  Chen; Q.  Chen; Y.  Fang; C.  Wang; X.  Wang; J.  Li; Y.  Wang

doi:10.3989/mc.2023.297022

Autores/as

P. Chen School of Civil Engineering and Architecture, Anhui University of Science and Technology - Institute of Environment-friendly Materials and Occupational Health, Anhui University of Science and Technology - Anhui Hongchang New Material Co. Ltd https://orcid.org/0000-0002-5538-617X
Q. Chen College of Mechanics and Materials, Hohai University https://orcid.org/0000-0001-6623-9696
Y. Fang College of Mechanics and Materials, Hohai University https://orcid.org/0000-0002-2047-9931
C. Wang School of Civil Engineering and Architecture, Anhui University of Science and Technology https://orcid.org/0000-0002-1169-5130
X. Wang School of Civil Engineering and Architecture, Anhui University of Science and Technology https://orcid.org/0000-0002-6196-4968
J. Li School of Civil Engineering and Architecture, Anhui University of Science and Technology https://orcid.org/0000-0001-9914-5944
Y. Wang School of Civil Engineering and Architecture, Anhui University of Science and Technology https://orcid.org/0000-0003-4992-7205

DOI:

https://doi.org/10.3989/mc.2023.297022

Palabras clave:

Escoria activada con álcali, MgO, Retracción autógena, Retracción por secado

Resumen

Los materiales de escorias activadas alcalinamente (AAS) ya sea por NaOH o waterglass han sido criticados durante mucho tiempo por los problemas de retracción que estos sistemas presentan. A este respecto, este trabajo explora el empleo de MgO como activador y agente expansivo para preparar pastas de AAS sin retracción. Se estudiaron el tiempo de fraguado, la resistencia mecánica, la estructura de poros, la retracción autógena, la retracción por secado y los productos de hidratación de las pastas de AAS activadas con MgO. Los resultados experimentales confirmaron que el MgO puede mitigar eficazmente la retracción tanto autógena como por secado de los sistemas de AAS a través de la deformación expansiva causada por el Mg(OH)₂. En general, los AAS con una dosis más alta de MgO desarrollaron menos retracción y estructuras de poros más refinadas con más poros de gel. Se recomienda una dosis óptima del 9% de MgO para preparar AAS con una retracción cercana a cero y la mayor resistencia a la flexión.

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