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The effect of sealant movement on early strength development was investigated. Some specimens were subjected to intermittent cycles of compression and extension while curing, some were cured in a fixed position and then cycled, and others were continuously cycled while curing. The stresses at ±5 and ±10% deformation were used to monitor changes in sealant behavior. Movement rates of 0.5 and 0.05 mm/min were examined.
The strength development curves suggest that the sealant was essentially fully cured after seven to ten days. Intermittent movement during cure did not alter the final properties of the cured sealant, but continuously cycled specimens exhibited significantly lower modulus compared to specimens that were cured in a fixed position. The results were not influenced by the rate of movement. The claimed movement capability for the fully cured sealant used in this research is ±50%, but it was demonstrated that the sealant can accommodate no more than 10 to 15% deformation in its partially cured state.
sealant, cyclic movement, static cure, dynamic cure
Industry, Science and Technology Canada, Ottawa, Ontario