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    Por favor, use este identificador para citar o enlazar este ítem: http://hdl.handle.net/10259/10027

    Título
    Influence of air-entraining agent and freeze-thaw action on pore structure in high-strength concrete by using CT-Scan technology
    Autor
    González Cabrera, Dorys CarmenUBU authority Orcid
    Mena Alonso, ÁlvaroUBU authority Orcid
    Mínguez Algarra, JesúsUBU authority Orcid
    Vicente Cabrera, Miguel ÁngelUBU authority Orcid
    Publicado en
    Cold Regions Science and Technology. 2021, V. 192, p. 103397
    Editorial
    Elsevier
    Fecha de publicación
    2021-09
    ISSN
    0165-232X
    DOI
    10.1016/j.coldregions.2021.103397
    Abstract
    In this work, the effects caused by both the amount of air-entraining agent (AEA) and freeze-thaw cycles on microstructure of high-strength concrete have been analyzed. For this purpose, five series of concrete specimens have been manufactured, each of them containing a different amount of AEA. Then, all series have been subjected to up to 300 freeze-thaw cycles. In addition, the specimens have been analyzed using a computed tomography (CT) scan device at pre-defined freeze-thaw cycles and all data have been processed with digital image processing (DIP) software. The results reveal, on the one hand, that the quantity of AEA has a greater influence on pore structure, and additionally the freeze-thaw action only slightly modifies the pore structure. As AEA increases, a progressive rise of the porosity and the number of pores is observed up to a maximum value. Next, a decrease is noticed. Moreover, there is not a linear relation between porosity and AEA. Furthermore, as AEA increases, a variation of its size and shape is observed. Alternatively, the effect of freeze-thaw cycles is more complex and does not show a monotonous tendency. The results reveal that the first 50 freeze-thaw cycles have the strongest influence on pore structure, observing a decrease in porosity. For the rest of the cycles, the porosity increases progressively resulting, after 300 freeze-thaw cycles, in a slightly lower porosity in almost all series than in those presented at the beginning. Hydration of unhydrated cement particles alongside with microcracking act as opposite performances during the freeze-thaw cycles. Therefore, this can suggest that, under these conditions, freeze-thaw action is not able to damage significantly the microstructure of concrete. The results show that the series with a lower AEA content show a better behavior under freeze-thaw cycles. In this case, the specimens exhibit a lower porosity and a higher level of small pores, and the pores evince a more elongated shape. All these features lead to a more impermeable concrete and, therefore, with a better performance under freeze-thaw cycles.
    Palabras clave
    Computed tomography
    Air-entraining agent
    Freeze-thaw cycles
    High-strength concrete
    Pore structure
    Pore distribution
    Materia
    Ingeniería civil
    Civil engineering
    Materiales de construcción
    Building materials
    URI
    http://hdl.handle.net/10259/10027
    Versión del editor
    https://doi.org/10.1016/j.coldregions.2021.103397
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