The improved pavement joint involves digging a kerf in the roadway and filling it with a material made from a mixture of aggregates and polymer-modified bituminous binder. It’s the viscoelasticity of the mixture that allows movement (recovery of expansion) while ensuring tightness. The roadway seal ensures traffic continuity between the structure and the roadway. The aim is to pick up the structure movements and the deformations due to traffic.
To meet these technical requirements: expansion, resistance to traffic, waterproofing and user comfort, the coating joint provides the answer for medium and low span structures, with a blast of less than or equal to 25 mm.