Steel sheet piles are used for retaining walls. Due to their modularity, they can be easily installed and extracted after their service life. After their first use, they can be either directly recycled or reused several times and then recycled. The reuse of steel sheet piles allows to avoid new production and thus CO2-emissions for their production, reducing the environmental impacts per use. In temporary works, like construction pits, the reuse of sheet piles is common practice. Also, for certain permanent projects, there is no disadvantage in using second-hand sheet piles. Over the life cycle of the steel, 1,535 t of CO2-eq are emitted. Reuse of the sections saved 79% of greenhouse gases.

(François Fohl & Oliver Hechler. Creating a Roadmap Towards Circularity in the Built Environment. pp 25–35)