STP691

    Combined Influence of Freezing and Deicing Salt on Concrete—Physical Aspects

    Published: Jan 1980


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    Abstract

    The observation that the durability of concrete often is lower under the combined influence of frost and deicing salts than under frost influence alone is discussed with regard to several physical aspects and mechanisms, for example, hydrodynamic effect, capillary effect, supercooling, lowered melting point of water in smaller pores, layer- by-layer freezing. It is concluded that some of the most detrimental factors with regard to the durability of concrete are supercooling of water and aqueous solutions and a higher degree of saturation of the concrete in the presence of salts. The differing effects of dry application of deicing salts on snow-and-ice-covered concrete (temperature shock) compared to the preventive salt application on humid concrete (prevention of ice formation, but with some negative aspects) are discussed.

    Keywords:

    capillary effect, cement paste, concrete, crystallization pressure, deicing salts, durability (concrete), freezing, frost resistance, hydraulic pressure, layer-by-layer freezing, porous media, preventive salt application, salt solutions, saturation, supercooling (water), temperature shock, building materials


    Author Information:

    Harnik, AB
    Institut für Baustoffe, Werkstoffchemie und Korrosion, Department für Materialwissenschaften, Eidgenössische Technische Hochschule Zürich, Zürich,

    Meier, U
    Institut für Baustoffe, Werkstoffchemie und Korrosion, Department für Materialwissenschaften, Eidgenössische Technische Hochschule Zürich, Zürich,

    Rösli, A
    Institut für Baustoffe, Werkstoffchemie und Korrosion, Department für Materialwissenschaften, Eidgenössische Technische Hochschule Zürich, Zürich,


    Paper ID: STP36082S

    Committee/Subcommittee: E06.22

    DOI: 10.1520/STP36082S


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