From a circular standpoint it is interesting to reuse as much as possible construction and demolition waste (CDW) into new building projects. In most cases CDW will not be directly reusable and will need to be processed and stored first. In order to turn this into a successful business case CDW will need to be reused on a large scale. In this paper we present the concept of a centralized and coordinated location in the City of Utrecht where construction and demolition waste is collected, sorted, worked, stored for reuse, or shipped elsewhere for further processing in renewed materials. This has expected advantages for the amount of material reuse, financial advantages for firms and clients, generating employability in the logistics and processing of materials, optimizing the transport and distribution of materials through the city, and thus the reduction of emissions and congestion. In the paper we explore the local facility of a Circular Hub, and the potential effects on circular reuse, and other effects within the City of Utrecht.
This report was written for the municipality of Apeldoorn as a contribution to Cityloops. It consists of designing and planning tools and provides answers for the municipality of Apeldoorn to enable them to move towards a circular construction economy.
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This study evaluates the effectiveness of the European Union's Corporate Sustainability Reporting Directive (CSRD) in quantitatively measuring the transition of companies to a circular economy. First, using the most recent literature review on circularity metrics, a complete overview of the currently available circularity metrics is developed. Subsequently, it is determined which circularity metrics can be generated with the available quantitative datapoints of CSRD. The metrics that can be generated were analyzed on their ability to cover all circular strategies, to represent different Product-as-a-Service systems and to acknowledge the key role of Critical Raw Materials in a circular economy. The study finds that, with data disclosed under CSRD, metrics can be generated to cover all circular strategies. However, gaps remain in representing pay-per-use and pay-perperformance systems and the use of Critical Raw Materials. Recommendations are to include ‘Product utilization’ and ‘Mass of Critical Raw Materials used’ in the data disclosed under CSRD and to have an independent institution report data to enable benchmarking of performances. Finally, this study concludes with an overview of the metrics which enable to measure circular transitions using data disclosed by CSRD
Recycling of plastics plays an important role to reach a climate neutral industry. To come to a sustainable circular use of materials, it is important that recycled plastics can be used for comparable (or ugraded) applications as their original use. QuinLyte innovated a material that can reach this goal. SmartAgain® is a material that is obtained by recycling of high-barrier multilayer films and which maintains its properties after mechanical recycling. It opens the door for many applications, of which the production of a scoliosis brace is a typical example from the medical field. Scoliosis is a sideways curvature of the spine and wearing an orthopedic brace is the common non-invasive treatment to reduce the likelihood of spinal fusion surgery later. The traditional way to make such brace is inaccurate, messy, time- and money-consuming. Because of its nearly unlimited design freedom, 3D FDM-printing is regarded as the ultimate sustainable technique for producing such brace. From a materials point of view, SmartAgain® has the good fit with the mechanical property requirements of scoliosis braces. However, its fast crystallization rate often plays against the FDM-printing process, for example can cause poor layer-layer adhesion. Only when this problem is solved, a reliable brace which is strong, tough, and light weight could be printed via FDM-printing. Zuyd University of Applied Science has, in close collaboration with Maastricht University, built thorough knowledge on tuning crystallization kinetics with the temperature development during printing, resulting in printed products with improved layer-layer adhesion. Because of this knowledge and experience on developing materials for 3D printing, QuinLyte contacted Zuyd to develop a strategy for printing a wearable scoliosis brace of SmartAgain®. In the future a range of other tailor-made products can be envisioned. Thus, the project is in line with the GoChem-themes: raw materials from recycling, 3D printing and upcycling.
The increasing amount of electronic waste (e-waste) urgently requires the use of innovative solutions within the circular economy models in this industry. Sorting of e-waste in a proper manner are essential for the recovery of valuable materials and minimizing environmental problems. The conventional e-waste sorting models are time-consuming processes, which involve laborious manual classification of complex and diverse electronic components. Moreover, the sector is lacking in skilled labor, thus making automation in sorting procedures is an urgent necessity. The project “AdapSort: Adaptive AI for Sorting E-Waste” aims to develop an adaptable AI-based system for optimal and efficient e-waste sorting. The project combines deep learning object detection algorithms with open-world vision-language models to enable adaptive AI models that incorporate operator feedback as part of a continuous learning process. The project initiates with problem analysis, including use case definition, requirement specification, and collection of labeled image data. AI models will be trained and deployed on edge devices for real-time sorting and scalability. Then, the feasibility of developing adaptive AI models that capture the state-of-the-art open-world vision-language models will be investigated. The human-in-the-loop learning is an important feature of this phase, wherein the user is enabled to provide ongoing feedback about how to refine the model further. An interface will be constructed to enable human intervention to facilitate real-time improvement of classification accuracy and sorting of different items. Finally, the project will deliver a proof of concept for the AI-based sorter, validated through selected use cases in collaboration with industrial partners. By integrating AI with human feedback, this project aims to facilitate e-waste management and serve as a foundation for larger projects.
Verschillende maatschappelijke veranderingen dwingen de bouwbranche tot innovaties. Ondanks de potentie op het vlak van circulariteit en duurzaamheid van 3D-printen met kunststoffen kent deze technologie nog nauwelijks toepassingen in de bouw. Redenen hiervoor zijn achterblijvende materiaaleigenschappen en het verschil in cultuur tussen de bouwwereld en kunststofverwerkende industrie. Het bedrijf Phidias, richt zich op innovatieve en creatieve vastgoedconcepten. Samen met Zuyd Hogeschool (Zuyd) willen zij onderzoek doen naar het printen van bouwelementen waarbij de meerwaarde van 3D-printen wordt gezien in het combineren van materiaaleigenschappen. Zuyd heeft afgelopen jaren veel onderzoek gedaan naar het ontwikkelen van materialen voor 3D-printen (o.a. 2014-01-96 PRO). De volgende fase is de opgedane kennis toe te passen voor specifieke applicaties, in dit geval om de vraag van het MKB bedrijf Phidias te beantwoorden. Vanuit een ander MKB-bedrijf, MaukCC, ontwikkelaar van 3D printers, komt de vraag om de afstemming tussen materialen en hardware te optimaliseren. De combinatie van beide vragen uit het werkveld en de expertise bij Zuyd heeft geleid tot dit projectvoorstel. In deze pilotstudie ligt de focus voornamelijk op het 3D printen van één specifiek bouwkundig element met meerdere eigenschappen (bouwfysisch en constructief). De combinatie van eigenschappen wordt verkregen door gebruik te maken van twee (biobased) kunststoffen waarbij tevens een variatie wordt aangebracht in de geprinte structuren. Op deze manier kunnen grondstoffen worden gespaard. Het onderzoek sluit aan bij twee zwaartepunten van Zuyd, namelijk “Transitie naar een duurzaam gebouwde omgeving” en “Life science & materials”. De interdisciplinaire aanpak, op het grensvlak van de lectoraten “Material Sciences” (Gino van Strydonck) en “Sustainable Energy in the Built Environment” (Zeger Vroon) staat garant voor innovatief onderzoek. Integratie van onderwijs en onderzoek vindt plaats door studenten samen met een coach (docent) en ervaren professional aan dit onderzoek te laten werken in Communities for Development (CfD’s).
