BASt project "Pavements made of precast UHPC components

Concrete block pavements are an established alternative to conventional concrete pavements and asphalt pavements, especially in inner-city areas. Thus, concrete pavements are used extensively even in trafficked areas for design/aesthetic reasons and because they are easy to remove and reinstall for repairs (e.g. to utility lines). Although they are predominantly used in inhabited areas, their noise properties have not been the subject of research and product development to date. Although there are approaches to produce noise-reducing pavements from individual concrete blocks, these approaches have so far been limited to open-pored structures for noise reduction (e.g. Dutch product Stilstone). The main differences between conventional asphalt and concrete road pavements and paved surfaces are their small-scale nature and the resulting discontinuous load-bearing effect. The load-bearing capacity depends not only on the stone geometry but also to a large extent on the type of bedding, the joint width and the joint filling. The same applies with regard to the rolling noise to be expected. They are not only influenced by the surface texture of the stones but to a large extent by the spacing of the joints - i.e. the stone size -, by the geometry of the stones - rectangular or irregularly shaped, with or without chamfer - as well as by the width of the joints. In addition, the evenness and here the mutual level position of the stone surfaces without noise-relevant "steps" in longitudinal and transverse direction plays a role, i.e. the craftsmanship quality during laying. And last but not least, once achieved, evenness must also be ensured in the long term, which is very often not the case, for example, with pavers driven over in conventional unbound bedding.