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Abstract
Predicting the service life of building joint sealants exposed to service environments in less than real time has been a need of the sealant community for many decades. Despite extensive research efforts to design laboratory accelerated tests to duplicate the failure modes occurring in field exposures, little success has been achieved using conventional durability methodologies. In response to this urgent need, we have designed a laboratory-based test methodology that used a systematic approach to study, both independently and in combination, the major environmental factors that cause aging in building joint sealants. Changes in modulus, stiffness, and stress relaxation behavior were assessed. Field exposure was conducted in Gaithersburg, MD, using a thermally-driven exposure device with capabilities for monitoring changes in the sealant load and displacement. The results of both field and laboratory exposures are presented and discussed.
Keywords
Service life,
accelerated life testing,
sealing compounds,
deterioration,
weathering,
timber joints,
testing,
fatigue,
sealing compounds,
mechanical properties,
elasticity,
modulus of elasticity,
temperature,
humidity,
ultraviolet radiation,
polyvinyl chloride,
strains,
stresses,
buildings,
accelerated testing,
failure,
exposure tests,
stiffness,
aging,
durability,
stress analysis
Citation
White, Christopher C.; Tan, Kar Tean; Hunston, Donald L.; Williams, R. Sam. 2009. Durability of building joint sealants. Service live prediction of polymeric materials global perspectives. New York : Springer, c2009 : pages 115-128. ISBN: 0387848754: 9780387848754
