A newly developed modular culvert system demonstrates how infrastructure components can be redesigned for circularity, adaptability and reduced environmental impact. Developed by BAM, BTE, TNO and ProRail, the system introduces a demountable concrete culvert that can be disassembled, reused and reconfigured—offering a scalable alternative to traditional, monolithic infrastructure.

Culverts are essential elements in infrastructure, allowing water to pass beneath roads, railways or dikes. However, conventional culverts are typically custom-built and permanently fixed, making maintenance, replacement or adaptation both costly and resource-intensive.

Designed For Disassembly And Flexibility

The innovation lies in its modular and demountable design. Prefabricated elements are connected using reversible joints, allowing individual components to be removed, replaced or reused without demolition. This significantly extends the lifespan of the system while reducing maintenance costs and material waste.

For architects and landscape designers working on adaptive infrastructure or climate-resilient landscapes, this approach offers a flexible solution that can evolve alongside changing spatial or environmental conditions.

Three Material Innovations In One System

The system combines three key material innovations that together enable its circular performance. Firstly, the use of a more sustainable type of cement called INVIE reduces the environmental footprint of the concrete, achieving approximately 50% lower CO₂ emissions compared to conventional cement-based culverts. This makes it particularly relevant for projects aiming to meet stringent sustainability targets.

Secondly, basalt reinforcement replaces traditional steel reinforcement. Unlike steel, basalt does not corrode, significantly increasing durability and enabling disassembly without compromising structural integrity. This material choice also reduces maintenance requirements and extends service life.

Finally, demountable connections ensure that all components retain their material value after use. Instead of being demolished, elements can be reintegrated into new projects, supporting circular construction principles.

Scalable Infrastructure For A Changing Built Environment

The modular culvert system responds to increasing pressure on infrastructure networks, particularly in countries like the Netherlands where climate adaptation and spatial transformation are ongoing challenges. The design allows for rapid installation, easy modification and future reuse, making it suitable for applications ranging from small water crossings to larger tunnels for cyclists or vehicles.

Importantly, the system is designed to be cost-competitive with traditional solutions, removing a key barrier to adoption.

Towards Circular Infrastructure

A prototype is scheduled for construction and testing in late 2026, with a pilot project expected in early 2027. This marks a significant step towards circular infrastructure systems that prioritise modularity, low-impact materials and long-term adaptability.

Source & image: TNO