Effects of the mineralogical composition and particle size distribution of ladle furnace slag as a cement/fine aggregate replacement in concrete

P.  Araos; T.  Montaño; S.  Valls; M.  Barra; D.  Aponte

doi:10.3989/mc.2023.301422

Autores/as

P. Araos Department of Civil and Environmental Engineering, Universitat Politècnica de Catalunya BarcelonaTech https://orcid.org/0000-0003-4064-2828
T. Montaño Department of Civil and Environmental Engineering, Universitat Politècnica de Catalunya BarcelonaTech https://orcid.org/0000-0003-2288-3003
S. Valls Department of Civil and Environmental Engineering, Universitat Politècnica de Catalunya BarcelonaTech https://orcid.org/0000-0001-8586-7700
M. Barra Department of Civil and Environmental Engineering, Universitat Politècnica de Catalunya BarcelonaTech https://orcid.org/0000-0002-1417-1615
D. Aponte Department of Civil and Environmental Engineering, Universitat Politècnica de Catalunya BarcelonaTech https://orcid.org/0000-0001-5737-7819

DOI:

https://doi.org/10.3989/mc.2023.301422

Palabras clave:

Hormigón, Escoria blanca de acería, Propiedades mecánicas, Inestabilidad volumétrica, Microestructura

Resumen

La escoria blanca de acería (LFS) presenta potencial para ser valorizada. Sin embargo, su destino es ser depositada en vertedero, debido a barreras tecnológicas en su proceso de valorización. Este trabajo explora el potencial uso de LFS como reemplazo parcial de cemento/árido fino, enfocándose en los efectos de la composición y granulometría de LFS sobre propiedades físico-mecánicas. Se evalúa la composición química/mineralógica (muestras anhidras/hidratadas), propiedades en estado fresco/endurecido y ensayos de inestabilidad volumétrica en hormigón. Los resultados muestran un menor desempeño mecánico con el reemplazo de LFS, alcanzando 32-42 MPa de resistencia a compresión (28 días). La caracterización mineralógica de LFS revela la ausencia de CaO-libre y presencia de periclasa con sus productos de hidratación/carbonatación. Por lo tanto, el proceso de meteorización/maduración afecta principalmente a la CaO-libre. Además, la inestabilidad volumétrica observada se encuentra dentro de los límites establecidos por la EHE (0,04%), donde la periclasa remanente podría ser la responsable de este comportamiento expansivo.

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