Fine aggregate mastic asphalt (10 mm thickness) on glass fibre net, or polymer modified bituminous sheet (SBS) is most commonly used for waterproofing concrete bridge decks in Sweden. Polymer modified mastic asphalt was introduced on the basis of the requirements specification in BRO 94 (for road bridges maintained by the National Road Administration) and has to a great extent replaced conventional mastic asphalt, used in Sweden since 1970. The First part of this presentation and document describes a study on laboratory testing of a number of mastic asphalt products for waterproofing concrete bridge decks. Performance at low and high temperatures has been studied and the binder has been analysed before and after recovery. The study was performed in order to find suitable tests for the characterisation and functional testing of polymer modified mastic asphalt for waterproofing concrete bridges in Sweden. SBS-modified mastic asphalt has proved to be the most suitable material for Swedish conditions and testing routines used today. The second part of the document describes a project for choosing the most suitable waterproofing and pavement system for the Höga Kusten bridge (which will be one of the world's longest suspension bridges). As a result of research and testing during this project period, a suitable system for the Höga Kusten bridge has been suggested by the National Road Administration. Waterproofing and pavement will be laid during late summer of 1997. (A)
Samenvatting