Abstract
It is well known that the stmetures forming infrastructures are influenced and deteriorated with the many mechanical and chemical factors. Specially, the peeling of the concrete pieces from reinforced concrete is one of the most emergency problems of reinforced concrete. The one popular method of counter measure to prevent the falling of concrete pieces is the arrangement lining on the reinforced concrete members. In the lining method, many materials which are FRP, polymers, resin mortar, steel and so on are used.Recently, it is thought that the urea system elastomer is a new material applied on the concrete lining. The urea system elastomer has good chemical resistance and large deformation capacity. But the environmental durability of urea system elastomer is not known. Then the authors canied out some experiments and the discussions about the durability of urea system elastomer.
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