In these days, many repair examples of the concrete structure have been reported and the durability of concrete structure is taken up as an important issue. Outdoor exposure test is the most practical way to evaluate the durability of surface coating material on the concrete structure but it requires long time to complete. Therefore it is also a big issue to propose an accelerated weathering test to shorten the time for evaluation.
The Subcommittee on Polymers for Repairing and Strengthening Concrete Structures under the Committee on Polymers in Concrete (Chair: Toyoaki Miyagawa) within the Society of Materials Science Japan (JSMS), has conducted common tests on the surface coating materials since 2006. The purposes of common tests are to propose common test procedures which enable comprehensively to evaluate the durability of the surface coating material on concrete. Furthermore the Subcommittee carried out another two weathering tests (accelerated) in the secondary part of the common test to obtain the durability of surface coating material in short time.
As a result of investigation on adhesion performance focusing on the relationship between the actual outdoor exposure test and the accelerated weathering tests, it was concluded that an accelerated weathering test was effective for some of the coating systems.
