The Effect of Movement During Cure of a Silicone Sealant

摘要

Movement of a building joint sealant during cure is believed to affect the "fully cured" mechanical properties and the durability. A one part silicone was cured for 10 h to 168 h before the onset of physical deformation cycles. These cure times fall between the proposed RILEM TC-139 technical recommendation of 5 min and the ASTM C719 durability standard of 21 d. Apparently, enough cross-linking occurred prior to testing such that neither the overall movement history of the sample nor the deformation regime shapes affected subsequent curing or mechanical properties of the sealant.