Durabilidad de UHPFRC funcionalizados con nanoaditivos por la acción sinérgica de sulfatos y cloruros en estado fisurado y no fisurado
DOI:
https://doi.org/10.3989/mc.2021.14021Palabras clave:
UHPFRC, Nanoaditivos, Sulfatos, Cloruros, FisuraciónResumen
El objetivo de este trabajo está enfocado en el estudio de la durabilidad de hormigones de ultra altas prestaciones reforzados con fibras (UHPFRC) con alto contenido en escoria de alto horno (BSF) y nanoaditivos como aditivo cristalino (CA), nanofibras de alúmina (ANF) y nanocristales de celulosa (CNC), expuestos a diferentes condiciones ambientales agresivas: 1) Tres medios agresivos: a) agua desionizada (dw), b) rico en sulfatos (ss) y c) agua geotérmica simulada (sgw) que contiene sulfatos y cloruros; 2) dos condiciones de interacción de agua: a) estática y b) dinámica (impacto de agua); y 3) con y sin la presencia de fisuras. La durabilidad fue analizada durante 24 meses, midiendo varios parámetros fisico-químicos del sistema, informando acerca de los cambios en el medio agresivo y en el hormigón. Todos los tipos de UHPFRC demostraron buena durabilidad mostrando una alta resistencia a la expansión y a la deformación en medios de alto contenido en sulfatos. Un proceso de lixiviación tuvo lugar en todos los sistemas de interacción, siendo el dinámico en sgw el más agresivo. La interacción del sgw dentro de la fisura favorece la formación de fases sólidas como carbonatos de calcio y etringita, mientras que la presencia de nanoaditivos afecta a la respuesta de la matriz, así como la formación de precipitados dentro de la fisura.
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