This paper presents the initial results of research on polymer-modified asphaltic plug joints (APJ) on bridges and an overview on the practical aspects and scientific background of the new Swiss guidelines, which were released by the Swiss Federal Roads Office (ASTRA) and developed in close coordination with the German road authorities. It focuses on recent EMPA research for laboratory and field characterization of the APJ materials as well as on the evaluation of the relevant mechanical characteristics for the APJ system such as adhesion, permanent deformation and low temperature cracking. In addition, results from a construction monitoring and long-term field performance research project on eighteen plug joints on bridges are presented. Further development of accelerated full-scale laboratory tests at EMPA are also discussed.

The experience with the new Swiss guidelines and the research results show, that the performance of polymer-modified asphalt plug joints can be improved significantly if materials are selected and handled professionally and construction is carried out by well trained teams. It was found that tests and requirements are suited to detect and eliminate inadequate materials and systems, thus reducing the risk of damage and encouraging the development and improvement of those joints. It was also found that accelerated full-scale laboratory testing might be of assistance in this respect.