STP691: Ice Formation in Hardened Cement Paste—1. Mature Water-Saturated Pastes

    le Sage de Fontenay, C
    Assistant professor and associate professor, Building Materials Laboratory, Technical University of Denmark, Lyngby,

    Sellevold, EJ
    Assistant professor and associate professor, Building Materials Laboratory, Technical University of Denmark, Lyngby,

    Pages: 14    Published: Jan 1980


    Abstract

    Ice formation in mature, water saturated hardened cement pastes (water/cement ration (W/C) from 0.4 to 0.7) has been measured using the Calvet microcalorimeter. The specimen size was about 11 cm3. The major results are: (a) little ice forms below about -55°C; (b) the rate of ice formation is not a monotone function of temperature, but contains three well defined peaks centered around -8, -23, and -40°C. The relative magnitude of the peaks is a function of the W/C-ratio; (c) melting takes place continuously from -55°C, but by far the major part of the ice melts close to 0°C; (d) the frozen part of the evaporable water varies from 20 percent (W/C = 0.40) to 57 percent (W/C = 0.70); (e) the rate of cooling (in the range 1.7 to 13.3°C/h) has relatively little influence on the amount of ice formed at a given temperature; (f) by far the major part of the ice forms in the pore system.

    Keywords:

    hardened cement paste, calorimetry, ice formation, heat capacity, durability, building materials


    Paper ID: STP36078S

    Committee/Subcommittee: G03.02

    DOI: 10.1520/STP36078S


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