In modern days, an efficient road/railway infrastructure operations require regular monitoring and timely maintenance. Inherently, these are multidisciplinary challenges that need to bring different disciplines to join their forces together to come up with innovative solutions. The understanding of the fundamentals of road/railway including infrastructure, materials, dynamics, serviceability, etc. is essential for real-life deployment of new methodologies. Further, in the latest years, these fields have observed innovative solutions by embedding latest technologies available for sensing, IoT, infrastructure asset management, big-data approaches, artificial intelligence, digitalization, etc. As such, key research works are being carried out around the globe aiming to improve the availability and sustainability of transportation infrastructure. The multidisciplinary topic aims to provide a unique platform where the state-of-the-art methodologies, applications and developments in transport infrastructures and construction materials are put together. This multidisciplinary topic also welcomes review papers. Key topics: New sensors and methodologies for monitoring transportation infrastructure and materials. Structural performance and degradation modelling and monitoring for pavement and railway infrastructures. Analysis of new material degradation, monitoring, and prediction, for durable, resilient, and low-maintenance pavement and railway infrastructures. Recycling and sustainable methodologies for transportation infrastructure materials. New materials and new elements for environmentally friendly building/construction of road and railway infrastructures. Analysis of case studies of failures/anomalies in transportation infrastructures. Assessment and performance predictions of transportation infrastructures based on physical models, data-based models, and hybrid models. AI-based methodologies for monitoring the transportation infrastructure. Big-data approaches for a green and digital transportation infrastructures. Challenges on digitalization, development of digital twins, and sustainability assessment of infrastructures.@en

Infrastructure (e.g., road and rail) makes up a major part of the built environment and is the pillar of a developing economy. However, infrastructure construction consumes around 60% of the world’s materials and is responsible for around 53% of the world’s greenhouse gas emissions. Managing products and materials in a circular way, instead of producing new ones, can help cut down on material consumption and limit environmental impact. Nevertheless, the main concern of reusing recycled and waste materials is how to improve their capability to maintain (or even improve) infrastructure performance.

This Special Issue on “Reusing Processes of the Recyclable and Waste Materials in Infrastructure Engineering” seeks high quality studies focusing on the latest novel advances technologies for reusing infrastructure wastes (e.g., construction and demolition waste, steel slag, rubber, plastics, plant-based binders, etc.). Topics include, but are not limited to:

Railway circularity (rail, rail pads, sleeper, ballast, etc.);
Pavement circularity (foundation layers, pavement layers, urban and highway pavements, etc.);
Reusing Processes (separation technologies, alkali activation, rejuvenation, etc.);
Data science in infrastructure recycling (waste classification and pattern recognition, real-time inspection, digital twins, structural health monitoring, etc.).@en