STP691

    Possibilities for More Precise Evaluation of the Resistance of Concrete to an Aggressive Medium

    Published: Jan 1980


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    Abstract

    The degree of concrete corrosion achieved in a certain period of time due the effect of a given aggressive solution depends on the concentration of aggressive component in the acting solution, the conditions of the solutions activity, the composition of cement specimen, the overall concrete porosity, and other factors. On the whole, the degree of concrete corrosion in a given aggressive medium and in a given period of time can be expressed by DC=ηoηtη1η2ηx in which ηo expresses the functional relationship of corrosion rate on the concentration of the given aggressive component in acting solution, and ηt, gives the functional relationship of rate change of the given kind of corrosion on the time of action of the aggressive solution. Then the members, η1−ηx, express the influence of other cooperating factors on the rate of the given kind of corrosion. Based on the results of experimental research, formulas were derived for ηo and for ηt in the case of sulfate corrosion. Furthermore, a formula was derived for ηC3A expressing the influence of the tricalcium aluminate (C3A) contents in portland cement on the rate of sulfate corrosion.

    Keywords:

    cement concrete, resistance of concrete, concrete corrosion, rate of corrosion, degree of corrosion, aggressivity of medium, evaluation of aggressivity, lifespan of concrete structure, durability, building materials


    Author Information:

    Jambor, J
    Head, Institute of Construction and Architecture, Slovak Academy of Sciences, Bratislava,


    Paper ID: STP36067S

    Committee/Subcommittee: G03.02

    DOI: 10.1520/STP36067S


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