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|Author(s):||Christopher C. White; Donald L. Hunston; Kar T. Tan;|
|Title:||Effect of Strain on the Modulus of Sealants Exposed to the Outdoors|
|Published:||March 11, 2009|
|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.|
|Citation:||Journal of ASTM International|
|Keywords:||Sealant, Strain, Modulus, Outdoor Weathering, Characterization|
|Research Areas:||Building Materials|