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Coastal biogenic structures, formed by ecosystem engineering species, often feature rough surfaces characterized by intricate topographies and highly threedimensional reliefs. Their surfaces are shaped by waves and tidal currents and reciprocally influence the ambient hydrodynamics, reflecting an equilibrium. Despite their significance, the impact of these surfaces on the ambient hydrodynamics remains underexplored due to limited knowledge of accurately replicating their complex topographies in experimental setups. The recent advent of advanced digital manufacturing presents an efficient means to manufacture highly complex, three-dimensional surrogate models for experimental modeling. This work explores the accurate replication of rough coastal biogenic structures for experimental modeling on the examples of an oyster reef and a mussel bed, utilizing a flexible design methodology and, for the first time, particle bed 3D printing with Selective Cement Activation (SCA) as a fabrication and manufacturing method. A workflow is proposed, which includes an iterative surrogate model development based on in-situ topographical features, requirements of the experimental setup, and parameters of the particle bed 3D printer with SCA. The results demonstrate the effectiveness of the methodology in achieving highly accurate surrogate surfaces of complex coastal biogenic structures by validation against a set of topographical features relevant to hydraulic roughness. Particle bed 3D printing with SCA proved to be a suitable method to manufacture complex surrogate surfaces for experimental modeling, offering advantages such as independence of production time from surface complexity. However, challenges persist in achieving exact comparability between the manufactured surrogate surface and the real coastal biogenic structures, particularly for surfaces with very high complexity. Nonetheless, the manufactured generic surrogate surfaces enable detailed investigations into the influence of complex coastal biogenic structures on the ambient hydrodynamics, thereby enhancing the understanding of the processes governing wave energy dissipation attenuation, turbulence production, and vertical mixing - critical for efficient application as a nature-based solution on coastal protection or restoration efforts. [ABSTRACT FROM AUTHOR]

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Non‐Waste‐Wax Formwork for customized precast concrete construction – Practical example of the digital manufacturing process for small series of large‐format bollards At the Institute for Structural Design, ITE, fundamental research work has been carried out to develop the non‐waste wax formwork technology, which minimizes formwork waste in the production of freely formed concrete components. This is intended to meet the needs of the precast concrete component industry for technologies to reduce production waste and build low‐emission production lines. The current Eurostars‐funded research project "Robocrete" at ITE together with ODICO Construction Roboctics, Odense, Denmark, and BNB, Beton und Naturstein Babelsberg, is investigating, among other things, processes for the production of large‐format wax block blanks for industrial integration into production lines for small series. The aim is to combine the research results in a digitalized robotic production unit for wax formwork for concrete casting. In previous research, it was not possible to efficiently produce crack‐ and stress‐free wax blocks with a volume of more than 1 m3. For this purpose, optimized methods for the production of wax block are being researched and developed further into a fully digital manufacturing process. In a case study under real conditions of the precast concrete industry with the company Rinn, the wax formwork technology for casting of a geometrically complex concrete bollard 1.2 t of weight was successfully tested. [ABSTRACT FROM AUTHOR]

Copyright of Bautechnik is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Bautechnik is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Non-Waste wax formwork-technology Today's possibilities to realize complex free-form reinforced concrete shapes, curved walls and filigree details require a formwork technology which meets these challenges. High precision with maximum freedom of form is therefore an essential requirement for the formwork of this new, so-called freeform architectures. Preconditions for this are the 3D digital design and manufacturing technologies, with their help formwork can be designed and manufactured in high precision and with many degrees of freedom in form. This paper describes a research approach using industrial waxes as formwork materials. Due to the nearly 100 % recyclability of the wax, this approach is an economical and ecological manufacturing process for customized free-form-members made of concrete. [ABSTRACT FROM AUTHOR]

Trotz der enormen Entwicklungen in der digitalen Planung und Fertigung wird unser Denken im Bauwesen immer noch vom Standard der industriellen Fertigung geprägt. Die aus Stahl und Holz produzierten Profile und Halbzeuge, ebenso wie die marktüblichen Schalungssysteme für Betonbauteile, implizieren eine möglichst einfache Geometrie und Fügung. Demzufolge sind heutige Tragkonstruktionen meistens aus biegebeanspruchten, masseintensiven Bauteilen zusammengesetzt. Leichte formaktive Tragwerke, wie beispielsweise die 1972 erbaute Lufthansa Wartungshalle V am Frankfurter Flughafen, sind dagegen kaum noch zu finden. In Zukunft wird dem effizienten Einsatz von Material und Energie eine entscheidende Bedeutung für die Umsetzung einer nachhaltigen Bauwirtschaft zukommen. Statt Komplexität auf Kosten erhöhter Massen zu vermeiden, wird es zukünftig vielmehr darum gehen, Material durch strukturelle Effizienz einzusparen. Die Chance hierzu liegt in der Zusammenführung der neuesten Entwicklungen im Bereich der Materialtechnologie mit denen der digitalen Planung und Fertigung. Ziel muss es sein, für high-tech-Werkstoffe - wie ultrahochfestem Stahlfaserbeton (UHPFRC) - dem Material angemessene Non-Standard Fügeprinzipien zu entwickeln, die trotz gestiegener Komplexität wirtschaftlich zu fertigen sind. Hier setzt der vorliegende Beitrag an und zeigt aktuelle Forschungsergebnisse zu innovativen Fügeprinzipien für leichte Bauteile aus UHPFRC. Non-standard principles for joining lightweight members made from UHPFRC Despite the enormous developments in digital design and fabrication methods our thinking in the construction industry is still dominated by the standard of industrial production. The profiles and semi-manufactured parts made from steel and wood as well as the on the market available formwork systems for concrete structures imply the simplest possible geometry and addition. Consequently, today's load-bearing structures are usually composed of bending stress mass-intensive components. Lightweight form-active structures such as built in 1972 Lufthansa Maintenance Hall V at Frankfurt airport, however, are hard to find. In the future, the efficient use of materials and energy will have a crucial importance for the implementation of sustainable construction. Instead of avoiding complexity at the cost of increased masses, the goal for the future will be to save mass by using structural efficiency. The opportunity for this lies in the combination of the latest developments in material technology with the digital planning and production. The aim for high-tech materials such as ultra high performance fibre reinforced concrete (UHPFRC) must be to develop material appropriate non-standard joint principles that are produced economically despite increased complexity. This is where the present contribution starts showing the current research results for innovative principles for joining lightweight members from UHPFRC. [ABSTRACT FROM AUTHOR]