The construction project for V-ZUG<\/a> ‘s new production and assembly building called Zephyr Ost in the Zug Tech Cluster<\/span><\/a> is the largest to date in which CO2-enriched concrete has been used. It is made from recycled concrete from the building materials group Holcim<\/a> , which is enriched with CO2 using a neustark<\/a> process. According to a press release<\/a> , the construction work started on Wednesday. The building is scheduled to go into service in 2023.<\/p>\n For this climate-friendly concrete, CO2 from Switzerland is being used for the first time. The start-up based in Bern and spun off from the Swiss Federal Institute of Technology Zurich ( ETH<\/a> ) in 2019, neustark extracts the CO2 from the wastewater treatment plant of the ara region Bern AG<\/a> .<\/p>\n The recycled granulate for concrete production is processed by the recycling processing plant Arge EvoREC<\/a> in Oberdorf NW. This is a joint venture between Holcim Kies und Beton AG and Zimmermann Umweltlogistik AG<\/a> . The granulate is then carbonated by neustark using the dry process. The technology has been tested in the past few months and is now being used commercially.<\/p>\n With the use of 4,200 cubic meters of recycled concrete and the binding of CO2, a total saving of 71 tons of CO2 is achieved compared to conventional construction. That corresponds roughly to the annual CO2 uptake of 3500 Swiss firs.<\/p>\n “We are pleased to be able to come one step closer to our vision of climate-neutral and circular concrete production with the help of the innovative neustark process,” said Giovanni Barbarani, Head of Concrete Performance<\/span> at Holcim Switzerland. “This project is a milestone on the way to sustainable building in Switzerland, also thanks to its regionality and short transport routes.”<\/p>\n