Volume 6, Issue 2 (February 2009)

    Effect of Strain on the Modulus of Sealants Exposed to the Outdoors

    (Received 19 June 2008; accepted 18 November 2008)

    Published Online: 2008

    CODEN: JAIOAD

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    Abstract

    The effects of applied strain on sealants exposed to outdoor weathering were examined for two sealant formulations, Sealants A and C. Both static and dynamic strain was applied to the sealants during the summer in a Gaithersburg, MD outdoor location. Both sealants exhibited a reversible change in equilibrium distance. Stress relaxation studies on all samples revealed that, for Sealant A, two mechanisms affected modulus change; exposure without applied strain increased the modulus while additionally applied strain decreased the modulus. Only one mechanism that decreased the modulus was found for Sealant C. A 7 % dynamic strain and a 25 % static strain were observed to produce equivalent modulus changes in both systems.


    Author Information:

    White, Christopher C.
    National Institute of Standards and Technology, Building and Fire Laboratory, Gaithersburg, MD

    Hunston, Donald
    National Institute of Standards and Technology, Building and Fire Laboratory, Gaithersburg, MD

    Tan, Kar Tean
    National Institute of Standards and Technology, Building and Fire Laboratory, Gaithersburg, MD


    Stock #: JAI101954

    ISSN: 1546-962X

    DOI: 10.1520/JAI101954

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    Author
    Title Effect of Strain on the Modulus of Sealants Exposed to the Outdoors
    Symposium Presented at the ASTM Third Symposium on Durability of Building and Construction Sealants and Adhesives, 2008-06-26
    Committee C24