Prediction of Sealant Modulus Change due to Outdoor Weathering

Published: May 13, 2015

Author(s)

Christopher C. White, Kar T. Tan, Donald L. Hunston, Adam L. Pintar, James J. Filliben

Abstract

An empirically-based model has been created to predict the change in modulus for a sealant exposed to outdoor weathering. The underlying high precision data supporting this model was obtained using the NIST SPHERE (Simulated Photo degradation by High Energy Radiant Exposure). The NIST SPHERE can independently precisely control each of the four primary components of the outdoor exposure: Temperature, Humidity, Ultraviolet Radiation and Mechanical Loading. The time-dependent modulus of the sealant samples were characterized using ASTM C1735-11 before and after each exposure period. The resulting empirically-based model produces two major results: the statistical significance of each of the weathering components and a prediction of modulus change for any location, provided a historical weather file is available. This sealant model has shown that all four weathering factors, listed above, are significant contributors to modulus change in sealant. Additionally, the geographical predictions allow for independent verification of these models.
Proceedings Title: Proceedings of the XIII International Conference on Durability of Building Components
Conference Dates: September 2-5, 2014
Conference Location: San Paulo , -1
Conference Title: XIII International Conference on Durability of Building Components
Pub Type: Conferences

Keywords

Service Life, Sealant, Models, Statistical Prediction, Mechanical Properties, Exposure
Created May 13, 2015, Updated November 10, 2018