Thin polymeric surface layers on concrete structures: an experimental study

trafficable waterproofing for concrete bridge decks. Flexible or rigid pavements are usually laid on bridges and viaducts; they need an underlying waterproofing, have a significant weight and are subject to several types of degradation because of limited durability. For this reason different solutions are now being investigated. A good alternative appears to be the application on bridge decks of surfacing made with resins and aggregate, in a mortar or alternatively a multi-layer form. Different mixes have been tested, made with a polymeric binder (epoxy resin) and natural or artificial/industrial aggregate (EAF slag, C&D aggregate, limestone, quartz sand). The mix is suitable for being applied in a single layer, with thickness of 2 to 4 cm over the cement concrete deck: it forms a lightweight pavement surfacing and, at the same time, durable waterproofing. Several trials have been performed in order to check the structural and functional properties of the mixes: pull-off for adhesion evaluation, wheel-track test for permanent deformation analysis, skid resistance and macro-texture measures, permeability evaluation. The results demonstrate that some of the investigated materials possess functional and mechanical characteristics that make them suitable for use on bridges.