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    Test Method for Determining the Efflorescence Potential of Masonry Materials Based on Soluble Salt Content

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    A single test method that is capable of determining the efflorescence potential for all materials in a masonry system is needed. The need for preconstruction testing is referenced in ASTM C1400-1—“Standard Guide for Reduction of Efflorescence Potential in New Masonry Walls”—but the standard acknowledges that there is not a suitable test method for all masonry materials. In the past, soluble salt measurements have been used to quantitatively access the efflorescence potential of masonry materials. To determine the water-soluble salt content of masonry materials, a simple leaching procedure was developed to remove the salts followed by quantification of the water-soluble salt content by ion chromatography. A series of modified efflorescence tests using salt solutions and real masonry materials has been used to determine the significance of water-soluble salt measurements. A clear threshold for soluble sulfate content that indicates a high potential for the development of visible efflorescence has been identified. Sulfate salts are the most common water-soluble compounds associated with efflorescence complaints.


    efflorescence, masonry, water-soluble salts, water-soluble compounds, brick, mortar, bloom, scumming, testing

    Author Information:

    Sanders, John P.
    Clemson Univ., Anderson, SC

    Brosnan, Denis A.
    Clemson Univ., Anderson, SC

    Committee/Subcommittee: C15.05

    DOI: 10.1520/STP49101S