Abstract
Weatherability of construction sealants was studied from the viewpoint of waterproofing. First, the outdoor exposure tests of 12 sealants were carried out for 10 years at Miyakojima, Choshi and Asahikawa in Japan, using the newly developed specimen which is able to reproduce wide range of sealing joint width in the same specimen. The joint width was moved once a month through exposure duration. The two kinds of cracking were observed such as shallow cracking on the surface of a bead and deep cracking at the close portion of it to the adhered face in the specimen. The depth of cracks was measured at the three positions of 0, 15 and 25% deformation rate in a specimen by a microscope and a taper gauge. Deep cracking is considered to be fatal rather than shallow surface cracking for waterproofing performance, and the weatherability estimation method of sealants was proposed.
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