STP713

    Influence of Selected Chelating Admixtures upon Concrete Cracking Due to Embedded Metal Corrosion

    Published: Jan 1980


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    Abstract

    It has been considered by the present research that if the solubility limit for embedded metal corrosion products can be increased or the products retained in solution altogether, then development of tensile stresses within the concrete and resultant cracking should be prolonged or eliminated. Consequently, the influence of selected chelating agents, including TEA, EDTA, DPTA, HEDTA, and Chel-138, upon various concrete properties has been evaluated. Specific tests investigated (1) the influence of each agent upon iron solubility as a function of pH, (2) the influence of the various agents as admixtures upon concrete strength, (3) the effect of the chelating agents upon corrosion of steel in aqueous solutions of pH 10 and 12 with 0 and 0.1 percent sodium chloride, and (4) the influence of the agents upon time-to-cracking of reinforced concrete cylinders in an accelerated test. While results of tests in Categories 1 and 3 were encouraging, it was determined that the chelating additions reduced concrete compressive strength. Further, time-to-cracking of admixtured specimens was extended beyond that of standard (no admixture) ones only for HEDTA and Chel-138 and then only under certain test conditions. It is concluded that, while the concept of adding chelating agents to concrete to enhance cracking resistance may be sound, increased time-to-cracking was not generally observed because of reactions between the various admixtures and the concrete.

    Keywords:

    reinforced concrete, admixtures, corrosion, concrete cracking, chelating agents


    Author Information:

    Yau, S-S
    Professor and graduate research assistant, Florida Atlantic University, Boca Raton, Fla

    Hartt, WH
    Professor and graduate research assistant, Florida Atlantic University, Boca Raton, Fla


    Paper ID: STP27468S

    Committee/Subcommittee: G01.14

    DOI: 10.1520/STP27468S


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