Study on binary and ternary systems with cement, hydrated lime and fly ash: thermogravimetric analysis, mechanical analysis and durability behaviour

P.  Lorca; españa; M.V.  Borrachero; J. Monzó; M.M. Tashima; J.  Payá

doi:10.3989/mc.2023.346623

Autores/as

P. Lorca Institute of Concrete Science and Technology (ICITECH), Universitat Politècnica de València https://orcid.org/0000-0002-4549-3289
españa Institute of Concrete Science and Technology (ICITECH), Universitat Politècnica de València https://orcid.org/0000-0002-5749-4609
M.V. Borrachero Institute of Concrete Science and Technology (ICITECH), Universitat Politècnica de València https://orcid.org/0000-0002-7873-0658
J. Monzó Institute of Concrete Science and Technology (ICITECH), Universitat Politècnica de València https://orcid.org/0000-0002-3657-3076
M.M. Tashima Institute of Concrete Science and Technology (ICITECH), Universitat Politècnica de València https://orcid.org/0000-0003-0885-9293
J. Payá Institute of Concrete Science and Technology (ICITECH), Universitat Politècnica de València https://orcid.org/0000-0001-7425-5311

DOI:

https://doi.org/10.3989/mc.2023.346623

Palabras clave:

Cal hidratada, Cemento, Ceniza volante, Termogravimetría, Portlandita, Propiedades mecánicas, Microscopía electrónica de emisión de campo

Resumen

El uso de altos porcentajes de sustitución de cemento Portland por puzolanas puede provocar el consumo total de la portlandita. La investigación propone el uso de un sistema ternario formado por cemento Portland (PC), ceniza volante (FA) y cal hidratada (CH). Después de 180 días de curado, el mortero con un 50% de sustitución de PC por FA obtiene 65.9 MPa de resistencia frente a los morteros con un 20% de CH y control (100 PC) que obtuvieron 69.9 MPa y 76.7 MPa respectivamente; este comportamiento es muy positivo teniendo en cuenta que este mortero tiene un 50% menos de PC. El efecto de añadir la cantidad extra de cal hidratada tiene efectos en la durabilidad; se estudió la evolución de la carbonatación de los morteros con PC-FA y PC-CH-FA. La reducción de la velocidad de carbonatación fue del 37% para los morteros con CH respecto al mortero con PC-FA.

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Citas

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