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    Por favor, use este identificador para citar o enlazar este ítem: http://hdl.handle.net/10259/6177

    Título
    Effect of the maturity of recycled aggregates on the mechanical properties and autogenous and drying shrinkage of high-performance concrete
    Autor
    Revilla Cuesta, VíctorAutoridad UBU Orcid
    Evangelista, Luís
    Brito, Jorge de
    Ortega López, VanesaAutoridad UBU Orcid
    Manso Villalaín, Juan ManuelAutoridad UBU Orcid
    Publicado en
    Construction and Building Materials. 2021, V. 299, 124001
    Editorial
    Elsevier
    Fecha de publicación
    2021-09
    ISSN
    0950-0618
    DOI
    10.1016/j.conbuildmat.2021.124001
    Resumen
    The high cement content of high-performance concrete (HPC) results in improved strength, but also in large shrinkage. The substitution of natural aggregates (NA) with recycled aggregates (RA) notably affects these properties in conventional concrete. This study intends to analyse the effect of the content of RA and their maturity (time elapsed between casting and crushing of the parent concrete from which RA are obtained) on these properties of HPC. To this end, five mixes were manufactured with 0%, 25%, and 100% of coarse and fine RA of different maturities, 7 days (early-age RA) and 6 months (matured RA). The mechanical properties and the autogenous, drying, and total shrinkage of all mixes were determined. Both the increase of RA content and the lower stiffness and strength of early-age RA relative to matured RA worsened the mechanical behaviour of HPC. Regarding shrinkage, the lower stiffness and higher water absorption of matured RA compared to NA decreased autogenous shrinkage by 20%, but increased drying and total shrinkage. The lower stiffness of early-age RA and their shrinkage amplified all types of shrinkage of HPC around 10–20%. Nevertheless, the hydration of their unhydrated cement particles during the mixing process reduced those increases from what was expected. Total shrinkage of early-age recycled aggregate HPC could be estimated from the shrinkage of both a HPC mix of identical composition but with matured RA and the parent concrete. Overall, it can be concluded that RA’s maturity affects the mechanical performance and, especially, the shrinkage of HPC, so it should be considered when using this type of aggregate.
    Palabras clave
    High-performance concrete
    Recycled aggregates
    Recycled aggregate’s maturity
    Mechanical behaviour
    Autogenous shrinkage
    Drying shrinkage
    Materia
    Ingeniería civil
    Civil engineering
    Materiales de construcción
    Building materials
    URI
    http://hdl.handle.net/10259/6177
    Versión del editor
    https://doi.org/10.1016/j.conbuildmat.2021.124001
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    Attribution-NonCommercial-NoDerivatives 4.0 Internacional
    Documento(s) sujeto(s) a una licencia Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 Internacional
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    Revilla-Cbm3_2021.pdf
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