TRU_20_01D_01

Zusammenfassung

The unique multi-scale optimization approach proposed herewith utilizes the advantages of laboratory testing at different scales and connects the improved durability characteristics of low-noise SDA to their performance on real roads. In a first step, SDA 4, SDA 6 and SDA 8 are characterized regarding their multi-scale properties in the lab as well as their long-term performance on roads as a reference. The former is done using a range of multi scale laboratory tests (e.g. electron microscopy, computed tomography (CT), fatigue testing) as well as unique large-scale durability testing capability (e.g. traffic simulator MMLS3). The latter is done using acoustic measurements of the around 500 SDA pavements installed in Switzerland. The core of this proposal constitutes two sequential optimization cycles that are undertaken at the material and mixture property level before the optimized samples are subjected to largescale durability testing using the traffic load simulator MMLS3 amongst other stress tests. Both optimization cycles involve substantial acoustical and mechanical performance testing undertaken by the three partners. The optimizations will be translated into expected improvements regarding the acoustic and mechanical durability of low-noise SDA on real roads, if applied. The outcome of the proposed project will provide the basis for an improved durability of low-noise SDA which can be directly applied by the industry and incorporated in nation-al standards.