EVALUATION OF CAPILLARY PORE SIZE CHARACTERISTICS IN HIGH-STRENGTH CONCRETE AT EARLY AGES

High-strength concretes with extremely low water/cement (w/c) ratios undergo significant self-desiccation if no external water is supplied to the concrete during the initial hydration process. This self-desiccation may cause cracks in the premature concretes. This article reports on a study of capillary pore size characteristics in high-strength concrete at early ages. The authors used quantitative scanning electron microscope-backscattered electron (SEM-BSE) image analysis, then applied the Powers model for the hydration of cement to the interpretation of the results of image analysis. The pore size distributions in concretes with an extremely low water/binder ratio of 0.25 at early ages were discontinuous in the range of finer capillary pores. The pore size distributions in silica-fume-containing concretes were continuous, compared with those in ordinary concretes. The authors conclude that the presence of the pores' equilibrium to the initial decrease in the relative humidity within concrete may bring about greater autogenous shrinkage in silica-fume-containing concretes.

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    Elsevier

    The Boulevard, Langford Lane
    Kidlington, Oxford  United Kingdom  OX5 1GB
  • Authors:
    • Igarashi, S-I
    • Watanabe, A
    • Kawamura, M
  • Publication Date: 2005-3

Language

  • English

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Filing Info

  • Accession Number: 00989007
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 29 2005 12:00AM