Revolutionizing Bridges: Reinforcement-Free 3D Innovation

A project by Holcim and partners introduces the Phoenix, a 3D-printed bridge without steel or mortar reinforcement. This eco-
3D Printed Bridge
3D Printed BridgeImage Source: Holcim


A project by Holcim and partners introduces the Phoenix, a 3D-printed bridge without steel or mortar reinforcement. This eco-friendly design utilizes recycled materials and assembly techniques for easy disassembly and recycling, cutting construction material use by up to 50%. The initiative aims to revolutionize sustainable infrastructure through innovative 3D printing methods.



In a departure from traditional construction methods, a collaborative effort led by Holcim has brought forth the Phoenix, a pioneering project in sustainable infrastructure development. The Phoenix, a 3D-printed bridge, signifies a shift towards reinforcement-free structures in modern construction.

Crafted by Holcim, in collaboration with the Block Research Group at ETH Zurich, Zaha Hadid Architects Computation and Design Group, and Incremental3D, the Phoenix project aims to revolutionize the construction industry's approach to building bridges and other structures.

This innovative project marks an evolution from the earlier Striatus bridge, introducing a novel concept of 3D-printed bridges without steel or mortar reinforcement. The Phoenix boasts a maximum height of 2.6 meters (8.5 feet) and a longest span of 17 meters (55 feet), showcasing the potential of 3D printing technology in construction.

The construction process involves the use of a 3D printer to layer a cement-based mixture, creating building blocks based on precise computer-generated plans. Impressively, the cement mixture incorporates 10 metric tons of recycled materials, demonstrating a commitment to sustainability and eco-friendly practices.

Philippe Block, Co-Director of Block Research Group at ETH Zurich, explains the design philosophy behind the Phoenix, emphasizing the utilization of historical principles to ensure easy disassembly and recycling, aligning with a sustainable and circular approach to concrete construction.

By adopting this method, the Phoenix achieves structural integrity through the compression generated by the blocks' geometry and abutments, significantly reducing the use of building materials. This approach not only fosters efficient construction but also facilitates easy deconstruction and recycling when required.

Looking ahead, Holcim and its collaborators are actively exploring avenues to scale up the Phoenix technology for broader application in infrastructure projects. This venture aims to revolutionize sustainable construction practices by promoting innovative and eco-conscious approaches in the construction industry.


The introduction of the Phoenix represents a significant milestone in the evolution of sustainable infrastructure. This groundbreaking initiative showcases the potential of 3D printing technology to revolutionize construction practices by prioritizing eco-friendliness, sustainability, and efficient material usage.

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