2007 Volume 53A Pages 696-705
Rubber bearings used in bridges are generally exposed to various environment conditions. It is usually known that the sunlight attacks rubber material, and causes it to entirely lose its elasticity and become sticky. In order to obtain the knowledge of the long-term performance of the ultraviolet exposed rubber products, the effect of ultraviolet irradiation on surface rubber of bridge rubber bearing has been examined through accelerated aging tests. Four kinds of rubber materials normally used were subjected to ultraviolet irradiation for a period up to 2 months. The changes in mechanical properties were investigated with different pre-strains. Besides, the influences of the amount of carbon black on the ultraviolet stability of natural rubber (NR) were evaluated. Finally, the long-term performance of surface rubber was estimated in consideration of the location.