STP1496: Variations in the Activity of Dry-Powder Water-Repellent Mortar Admixtures with Different Mortar Formulae

    Nordmeyer, Herb
    Project & Technology Manager and Senior Lab Technician, San Antonio Lab, Headwaters Construction Materials, San Antonio, Texas

    Hall, Pam
    Project & Technology Manager and Senior Lab Technician, San Antonio Lab, Headwaters Construction Materials, San Antonio, Texas

    Pages: 13    Published: Jan 2008


    Abstract

    A number of water repellents are added to masonry mixes and masonry units. To be classified as a water-repellent mortar admixture, ASTM C 1384 Specification for Admixtures for Masonry Mortars, requires that the 24-h rate of water absorption needs to be reduced by at least 50 % when compared to a control mortar without the admixture. While testing two well-known water-repellent admixtures, a substantial difference in activity was noted with the mortar that was being tested. Testing was expanded to include other water-repellent admixtures and several additional mortar formulae. This paper discusses the findings of that study.

    Keywords:

    water absorption, water repellent, mortars, ASTM C 1384


    Paper ID: STP45705S

    Committee/Subcommittee: C12.05

    DOI: 10.1520/STP45705S


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