2026/04/17
Mining Residues and Additive Manufacturing: Toward a New Generation of Printable Concrete
Every year, the mining industry generates massive volumes of residual materials from extraction processes, most of which remain underutilized. These materials, typically stored on the surface, represent both an environmental burden and a largely untapped industrial opportunity. In this context, additive manufacturing offers a promising pathway by enabling a complete rethinking of both materials and construction processes.
RI3D is actively developing concrete formulations tailored to the unique requirements of 3D printing. Unlike conventional concrete, these materials must meet strict criteria: they need to be pumpable, extrudable, and capable of maintaining their shape immediately after deposition. Each layer must support its own weight as well as that of subsequent layers, without collapsing, while still ensuring long-term mechanical performance.
A key focus of the project is the partial replacement of cement—one of the most carbon-intensive construction materials—with finely processed mining residues. This approach aims to significantly reduce the material’s carbon footprint while valorizing abundant industrial by-products. Additional avenues are also being explored, including the use of recycled concrete from demolition and bio-based materials.
Before any implementation, thorough characterization work is carried out to ensure that the residues are safe (e.g., absence of harmful elements such as arsenic or sulfides) and suitable for structural applications. The data collected is then used to optimize formulations, balancing mechanical strength, durability, and printability.
From a technological standpoint, RI3D leverages large-scale 3D printing systems capable of constructing structures using robotic arms. This approach reduces the number of construction steps while improving precision and repeatability. It also opens the door to increased automation in a sector currently facing significant labor shortages.
A first pilot project is underway with the construction of a 3D-printed building in Amos. The objective is twofold: to validate the performance of the developed concrete and to demonstrate the feasibility of additive manufacturing for residential applications. This demonstrator will also help establish benchmarks, standards, and best practices in a field where they are still largely lacking.
Beyond materials, additive manufacturing also enables new construction models. RI3D is notably focusing on off-site manufacturing and modular construction, allowing year-round building and significantly reducing project timelines. This approach could play a key role in addressing the housing crisis by increasing construction speed while maintaining high-quality standards.
Finally, RI3D’s work contributes to structuring Quebec’s additive construction ecosystem. By generating data, developing expertise, and fostering collaboration between industrial and institutional stakeholders, the initiative acts as a true catalyst for moving innovations from research to real-world applications.
At the intersection of circular economy and additive manufacturing, this initiative highlights the transformative potential of AM in the construction sector—leveraging local resources, reducing environmental impact, and accelerating the deployment of scalable solutions.