Volume 9, Issue 2 (January 1987)

    Comparative Study of the Microstructures of Normal and Very High-Strength Concretes

    CODEN: CCAOAD

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    Abstract

    The microstructure of a normal concrete with water/cement ratio (W/C) = 0.56 (f′c at 28 days = 31.8 MPa or 4610 psi) was compared with two series of very high-strength concretes (up to 118 MPa or 17 120 psi), one made with Type III cement and the other with the same Type III cement plus 6 to 10% silica fume. These concretes were water cured for 91 days. Their microstructural examination was undertaken using mercury porosimetry and scanning electron microscopy-energy dispersive X-ray analysis (SEM-EDXA).

    Similarities and differences are described in detail. Basically, both are composed of calcium silicate hydrates (C-S-H) and calcium hydroxide (C-H), but their proportions and morphology are quite different. The composition and types of C-S-H also vary. Significant differences in porosity and aggregate-cement bonding are present. Chloride ion permeability tests indicate the very high-strength concretes to be as impervious as polymer-impregnated types.


    Author Information:

    Aïtcin, P-C
    Professeur titulaire, Faculté des sciences appliquées, Université de Sherbrooke, Sherbrooke, Québec

    Sarkar, SL
    Attaché de recherche, Faculté des sciences appliquées, Université de Sherbrooke, Sherbrooke, Québec


    Stock #: CCA10070J

    ISSN: 0149-6123

    DOI: 10.1520/CCA10070J

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    Author
    Title Comparative Study of the Microstructures of Normal and Very High-Strength Concretes
    Symposium , 0000-00-00
    Committee C09