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    Por favor, use este identificador para citar o enlazar este ítem: http://hdl.handle.net/10259/6174

    Título
    Temporal flowability evolution of slag-based self-compacting concrete with recycled concrete aggregate
    Autor
    Revilla Cuesta, VíctorUBU authority Orcid
    Skaf Revenga, MartaUBU authority Orcid
    Santamaría, Amaia
    Hernández Bagaces, Jorge J.
    Ortega López, VanesaUBU authority Orcid
    Publicado en
    Journal of Cleaner Production. 2021, V. 299, 126890
    Editorial
    Elsevier
    Fecha de publicación
    2021-05
    ISSN
    0959-6526
    DOI
    10.1016/j.jclepro.2021.126890
    Abstract
    The addition of by-products, such as recycled concrete aggregate and ground granulated blast furnace slag, modify the in-fresh flowability of ordinary self-compacting concrete both initially and over time. A detailed study is presented in this paper of 18 mixtures (SF3 slump-flow class) containing 100% coarse recycled concrete aggregate, two types of cement (CEM I or CEM III/A, the latter with 45% ground granulated blast furnace slag), different contents of fine recycled concrete aggregate (0, 50, or 100%), and three different aggregate powders (ultra-fine limestone powder <0.063 mm, limestone fines 0/0.5 mm, and recycled concrete aggregate 0/0.5 mm). The temporal evolution of slump flow, viscosity, and passing ability, and the values of segregation resistance, air content, fresh and hardened density, and compressive strength were evaluated in all the mixtures. The addition of fine recycled concrete aggregate and CEM III/A improved initial slump flow and passing ability by 6%, due to their higher proportion of fines. Nevertheless, the temporal loss of flowability within 60 min was 5.8% lower when adding natural aggregate and CEM I. Viscosity and air content increased 26% on average following additions of fine recycled concrete aggregate, unlike with additions of ground granulated blast furnace slag. Flowability and strength increased with the addition of limestone fines 0/0.5 mm. According to multi-criteria analyses, the mixtures with CEM III/A, 50% fine recycled concrete aggregate, and limestone fines 0/0.5 mm showed an optimal balance between their flowability (SF2 slump-flow class 60 min after the mixing process), compressive strengths (around 60 MPa), and carbon footprints.
    Palabras clave
    Self-compacting concrete
    Recycled concrete aggregate
    Ground granulated blast furnace slag
    Flowability, viscosity and passing ability evolution
    Sieve segregation
    Air content
    Materia
    Materiales de construcción
    Building materials
    Ingeniería civil
    Civil engineering
    URI
    http://hdl.handle.net/10259/6174
    Versión del editor
    https://doi.org/10.1016/j.jclepro.2021.126890
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