Stock Photo - 10 December 2021, Saxony, Chemnitz: Sandra Gelbrich, head of the research area ""Lightweight Structures in Civil Engineering"" at TU Chemnitz, and work group leader Enrico Rudolph follow the production of a concrete flyweight arch using an automated 3D printing process. Scientists from the research area ""Lightweight Construction in Civil Engineering"" at the Institute of Structural Lightweight Design at Chemnitz University of Technology have been researching automated additive manufacturing technologies for five years. Recently, they presented the world's first 3D-printed concrete Schwibbogen. The Schwibbögen are 120 centimeters wide, 60 centimeters high and weigh 14 kilograms. They serve as reference objects in the development of innovative technologies for the efficient production of lightweight concrete elements with fiber reinforcement. Photo: Kristin Schmidt/dpa-Zentralbild/ZB. - Chemnitz/Saxony/Germany