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82 CPI %u2013 Concrete Plant International %u2013 1 | 2026 www.cpi-worldwide.comOn the former U.S. Army Campbell site in Heidelberg, Germany, a remarkable new residential construction concept is currently taking shape: the %u2018Dreihaus%u2019 project is a fully conceptualised, 3D-printing-optimised, scalable building concept that uses CO2-reduced construction materials. For the first Dreihaus reference buildings, Heidelberg Materials is supplying advanced high-tech materials with significantly reduced CO2 emissions.For the first two houses of the reference project on the Campbell site in Heidelberg, the CO2-reduced construction material evoBuild%u00ae 3D-Druck is being used. It contains a binder that already achieves more than a 50% reduction in CO2 emissions compared with traditional Portland cement. The third house will be the first in Germany to use evoZero%u00ae by Heidelberg Materials, a cement based on carbon capture and storage (CCS) technology.Real solutions for decarbonizing construction%u201cOur goal is to create genuine solutions for decarbonizing the construction sector and to drive sustainable innovation projects forward, together with our partners. With the German premiere of evoZero, we are today entering a new era of sustainable construction - both here in Heidelberg and across the country,%u201d explains Dr. Dominik von Achten, Chairman of the Managing Board of Heidelberg Materials.CO2-reduced construction materials for the 3D-project %u2018Dreihaus%u2018Innovative building concept for a three-storey multi-family residence in three sizesA unique residential construction concept is currently being developed on the former U.S. Army Campbell site in Heidelberg: the Dreihaus project.%u00a9 Heidelberg Materials AG