Long-term sulfate attack on recycled aggregate concrete immersed in sodium sulfate solution for 10 years

L. R. Santillán; F. Locati; Y. A. Villagrán-Zaccardi; C. J. Zega

doi:10.3989/mc.2020.06319

Autores/as

L. R. Santillán LEMIT, CONICET https://orcid.org/0000-0002-9040-4417
F. Locati CICTERRA, UNC-CONICET https://orcid.org/0000-0001-9067-1497
Y. A. Villagrán-Zaccardi LEMIT, CONICET https://orcid.org/0000-0002-0259-7213
C. J. Zega LEMIT, CONICET https://orcid.org/0000-0002-9199-9176

DOI:

https://doi.org/10.3989/mc.2020.06319

Palabras clave:

Hormigón, Ataque por sulfatos, Propiedades de transporte, Microfisuración, Análisis térmico

Resumen

El efecto del árido reciclado de hormigón (AR) en el desempeño del hormigón frente al ataque externo por sulfatos (AES) no es aún del todo conocido. En este trabajo, se evaluaron hormigones con áridos reciclados (HAR) con 0, 50, 75 y 100% de AR, tras 10 años sumergidos en solución de sulfato de sodio 50g/l. Se obtuvieron perfiles de ingreso de sulfato mediante análisis químico vía húmeda y FRX. También se evaluó la mineralogía de los perfiles por termogravimetría y la microfisuración mediante microscopia óptica con fluorescencia. Aunque los HAR mostraron un leve incremento en el ingreso de sulfatos debido a su mayor porosidad (aproximadamente 30% más de SO₃ en la superficie para reemplazos de 50% o mayores), una nueva matriz densa permite un aceptable desempeño del HAR frente al AES, aún con un 100% de AR.

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