A new device, the Creep Testing Apparatus (CRETA), has been developed for use in determining the viscoelastic properties of joint sealant. Creep tests were conducted on two types of silicone sealant: self-leveling (SL) and non-self-leveling (NS). The results appear to indicate that the silicone sealant tested is a linear viscoelastic material and that its creep response does not appear to be sensitive to temperature variations from 0 °C to 60 °C. Further creep tests were conducted under artificial aging conditions. Hot water aging appears to cause both SL and NS sealant to become softer and more ductile. Freeze-thaw aging did not appear to have an effect on the viscoelastic properties. Oven aging did not appear to affect SL sealant, but it did cause NS sealant to become stiffer. These results might be useful in a long-term joint performance model.
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