Comparing the effects of jouravskite and ettringite on the hydration of the clinker

H.Y.  Ghorab; M.K.  Mohamed; S.K.  Mohamed

doi:10.3989/mc.2023.300222

Autores/as

H.Y. Ghorab Faculty of Science, Chemistry Department, Helwan University https://orcid.org/0000-0001-6960-736X
M.K. Mohamed Faculty of Science, Chemistry Department, Helwan University https://orcid.org/0000-0003-1470-6752
S.K. Mohamed Faculty of Science, Chemistry Department, Helwan University https://orcid.org/0000-0001-6199-2099

DOI:

https://doi.org/10.3989/mc.2023.300222

Palabras clave:

Jouravskita, Etringita, Clínker, Hidratación, Solución de sulfato

Resumen

El manganeso ingresa al clínker a partir de combustibles alternativos y materias primas alternativas. Está presente en los minerales de hierro utilizados en la combustión del cemento y se encuentra en las escorias empleadas como materiales complementarios del cemento. La jouravskita, como miembro de la familia de la etringita, puede formarse en cementos de piedra caliza cuando se expone a medios ricos en sulfatos. Para comprender su efecto en el proceso de hidratación, se midió con un micrómetro la expansión de pequeñas pastas cilíndricas de clínker dopadas con jouravskita y etringita sintetizadas en soluciones de sulfato de magnesio, y se monitoreó la resistencia a la compresión de cubos representativos. Las fases formadas se caracterizaron mediante difracción de rayos X, espectroscopia infrarroja y microscopia electrónica de barrido. Se encuentra que la jouravskita es un fuerte retardador de la hidratación del clínker, probablemente debido a su adsorción en los hidratos de cemento.

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