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Shotcrete or sprayed concrete in tunneling in connection with the "New Austrian Tunneling Method” has been developed over the last decades to reach a high quality standard. However, at present the development of new shotcrete mixes is required to fulfill durability and stainability requirements, i.e. for superior performance in aggressive environments and reduction of maintenance costs. In the course of the project ASSpC ("Advanced and sustainable sprayed concrete") the research team focuses on producing and testing new and innovative shotcrete mixes using local and environmentally friendly raw materials. Sustainable and durable shotcrete with optimized mechanical and physical properties and improved chemical resistance is developed.
This paper outlines the motivation for the project, gives an overview of the project structure and introduces key reaction mechanisms and environmental controls causing damage of shotcrete in tunnels.
Die Errichtung von Straßendämmen auf wenig tragfähigen Böden erfordert meist konstruktive Maßnahmen zur Sicherstellung der Standsicherheit. Häufig werden hierzu Stabilisierungssäulen in den Boden eingebracht. Stabilisierungssäulen (StS) sind hydraulisch abgebundene, unbewehrte, schlanke, pfahlartige Tragglieder. Die Versagensmechanismen dieser Tragglieder erlauben es
nicht die Gesamtstandsicherheit, wie in der Praxis üblich, durch verschmierte Bodenparameter nachzuweisen.
Im vorliegenden Beitrag werden die Versagensmechanismen und das Verhalten passiv beanspruchter StS beschrieben. Basierend auf den mechanischen Modellen von Broms wird ein vereinfachter Ansatz zur rechnerischen Abschätzung der zusätzlichen Traggliedwiderstände vorgestellt. Ein numerisches Strukturmodell verdeutlicht das Verhalten passiv beanspruchter StS im Versagensfall. Die Erkenntnisse aus dem Strukturmodell werden in einem mechanischen Modell zusammengefasst, aus dem wichtige Rückschlüsse für die Bemessungspraxis abgeleitet werden.
After a short overview on the institutional situation and current tendencies in German building archaeology, this paper will focus on the recent discussion about how Bauforschung can tackle Germany’s modern built heritage. Buildings from the 20th century, which in their majority step away from craftsmanship towards a more industrialized building process, demand different research approaches than the building heritage from the 19th century and before. What has Bauforschung to offer in this field? Are we knowledge-wise and technically enough equipped for this task? Should we, on the contrary, leave the 20th century to other disciplines like architectural history? How can we gear up with yet again new tools and methods in order to add valuable insights in a built heritage that is about to vanish quicker than perhaps any other before? And, finally, which didactic challenges are we facing when teaching the Bauforschung of 20th-century-buildings? These questions will be discussed on the basis of selected projects on local industrial and public buildings from the 1910s to the 1980s.