Klimaverträglichkeit als Kriterium für Entwurf und Leistungsfähigkeit von Beton am Beispiel eines Kleintierdurchlasses der öBB

Climate Compatibility as a Criterion for the Design and Performance of Concrete illustrated by the Example of an ÖBB Small Animal Passage. Concrete is the world's most widely used building material and is preferred for infrastructure construction inter alia due to its high performance, versatility and durability. Its production and use, however, generates significant amounts of greenhouse gas emissions (CO₂eq). Consequently, any reduction of CO₂eq of the building material contributes to achieving the societal goal of CO₂ neutrality. In this paper, a small animal passage of an ÖBB railway line is used as an example to show how climate compatibility or CO₂-equivalents (kg CO₂eq/m³) are directly integrated into the mix design. It is also explained how the essential performance characteristics of climate-compatible concretes – in addition to the CO₂-equivalents, in particular their early strength and durability – can be considered and optimised in their entirety. For this purpose, performance-based concepts are applied for the optimisation of binders with combined additives and for the verification of durability. Furthermore, experiences with the realization, testing and quality assurance of CO₂eq-reduced concrete in comparison to equivalent standard concrete will be reported.