Due to increasing traffic demand, the need to find improved surfacing systems for the UK's stock of lightweight steel box bridges arose in the mid 1980s and still continues. These structures were originally provided with a thin (38mm) mastic asphalt surfacing system and rubberized waterproofing. The resurfacing of five major U.K. bridges with orthotropic steel decks is described, including background to research into replacement systems and their development towards enhancing the life of the underlying steel deck. A standardized method of system evaluation was then developed for tendering purposes. The paper describes practical aspects of system application, including deck inspection and repair. With reference to research findings and experience gained on several bridges, the paper will provide useful information on specifying and overseeing resurfacing contracts with long-term performance in mind Two different system types are discussed; conclusions are drawn on the effectiveness of the systems from the point of view of asphalt durability, the performance of underlying steelwork and the reliability of the application process. The paper addresses both design and practical considerations for the owner, specifier and applicator.
