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    Por favor, use este identificador para citar o enlazar este ítem: http://hdl.handle.net/10259/6372

    Título
    Mechanical performance and autogenous and drying shrinkage of MgO-based recycled aggregate high-performance concrete
    Autor
    Revilla Cuesta, VíctorAutoridad UBU Orcid
    Evangelista, Luís
    Brito, Jorge de
    Skaf Revenga, MartaAutoridad UBU Orcid
    Ortega López, VanesaAutoridad UBU Orcid
    Publicado en
    Construction and Building Materials. 2022, V. 314, Part B, 125726
    Editorial
    Elsevier
    Fecha de publicación
    2022-01
    ISSN
    0950-0618
    DOI
    10.1016/j.conbuildmat.2021.125726
    Resumen
    The high strength and durability of high-performance concrete (HPC) may be significantly reduced by shrinkage cracking. The use of reactive magnesium oxide (MgO) can reduce shrinkage of cement-based materials due to its expansive properties. This study intends to analyse the validity of MgO as shrinkage-reducing agent in recycled aggregate HPC. To do so, ten HPC mixes with 0%, 25%, and 100% of both early-age (7-days air curing) and matured (6-month air curing) RA were produced. In half of the mixes, 10% ordinary Portland cement was replaced with MgO. The use of MgO slightly worsened the mechanical behaviour of HPC, especially when combined with large amounts of RA. On the other hand, the expansion of MgO fully offset the autogenous shrinkage of HPC and reduced total shrinkage by around 20–40%. Water storage of RA, and its deferred release over time, produced a more efficient hydration of MgO, which in turn led to a further reduction of autogenous shrinkage. However, the increase of drying shrinkage caused by RA was greater than this decrease of autogenous shrinkage due to MgO, so the higher the RA content of HPC the lower the total shrinkage reduction when adding MgO. Thus, the decrease of total shrinkage caused by MgO was compensated by the shrinkage increase because of RA when adding amounts above 35% early-age RA and 42% matured RA. Therefore, despite the suitability of MgO as shrinkage-reducing agent in recycled aggregate HPC, its effectiveness was reduced with increasing amounts of RA.
    Palabras clave
    High-performance concrete
    Recycled aggregates
    Recycled aggregate’s maturity
    Magnesium oxide
    Autogenous shrinkage
    Drying shrinkage
    Materia
    Ingeniería civil
    Civil engineering
    Materiales de construcción
    Building materials
    URI
    http://hdl.handle.net/10259/6372
    Versión del editor
    https://doi.org/10.1016/j.conbuildmat.2021.125726
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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-cbm_2022.pdf
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