Concept and design of selected innovations for interurban infrastructure: Synthesis report

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The NR2C vision 2040 designates four main concepts for the road of the future. The innovations considered in WP2 all deal with solutions for one or more of the above concept needs, and mainly with the green infrastructure by reservation of rare resources via recycling and use of industrial by-products.

Innovation 2.1 A Design of high performance layer with raw material (EPFL-Switzerland, BRRC Belgium, and other FEHRL-laboratories as VTI, KTI, DRI). The goal is to evaluate if the growing share of recycled aggregate used in asphalt high stiffness base courses influences the asphalt mechanical properties. It is the aim of this study that no significant loss in asphalt fatigue, deformation and durability characteristics counterbalances the environmental and economic benefits coming from the use of recycled material. Comprehensive laboratory and Accelerated Loading Tests (ALT) are performed in the project.

Innovation 2.1B Crack free semi-rigid pavement incorporating industrial waste (LCPC-France) The goal is to evaluate if the natural cement concrete shrinkage can be compensated by adding industrial by-products (steel slag, fly ash) with swelling ability to the mixture. The consequences of the use of additional CaO are also tested. The main idea is to minimise (even to stop) the cracking of hydraulically bound layers and so, to avoid the reflection cracking in the asphalt layers built on them. The innovation is closely connected to the concept "safe infrastructure".

Innovation 2.2. Use of the infra-red characteristics of materials to improve drivers' visibility (LCPCFrance). The goal is to enhance the traffic safety by improving the drivers' visibility among unfavourable conditions (darkness, fog etc.). The use of infrared image technique can be the solution. Simulation and real test site measurements are applied for the validation of the innovative technique. It can contribute to the concept "reliable infrastructure".

Innovation 2.3. Optimisation of the maintenance process (Eurovia-France) The goal is to evaluate whether asphalt laying activities can be performed without detrimental consequences under extreme weather conditions (too low or too high temperature, rain etc.). The proposed innovative techniques are supposed to ensure the required asphalt quality and not to increase the construction costs considerably. The success of the project can contribute to the lengthening of the construction season without quality compromise. It was to contribute to the concept "reliable infrastructure".

Innovation 2.4. Improving the mechanical properties of a low noise section (VTI-Sweden, ZAGSlovenia) The goal of this innovation initiated in a later phase of NR2C WP2 activities is to evaluate (and eventually to improve) the functional and the mechanical properties (durability) of low-noise poroelastic layers built on cement concrete blocks. Laboratory and site tests are to be performed for the evaluation of these properties. So, it contributes to the concept "green infrastructure", by the reduction of noise nuisance coming from traffic.

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