Nachweis der Rückbindung von CO2 in Kalksandstein durch Rekarbonatisierung.

Translation abstract <bold>Rebinding CO2 in calcium silicate units through recarbonation</bold>Calcium silicate units (CSU) are manufactured using burnt lime. When installed in contact with air, CSU absorb more than 3 % of their own weight in CO2 from the air and store it permanently in the structure. An equal amount of CO2 was previously released during the production of burnt lime. This reabsorption is known as recarbonation. This article is based on the examination of around 2 t of masonry and documents this CO2 absorption. The data presented allows the conclusion that CSU usually recarbonate in contact with air within 50–60 years. As the service life of solid buildings generally exceeds 60 years by far, the simplified assumption of 95 % recarbonation at the end of the utilisation phase seems appropriate. The exact amount of CO2 reabsorption depends on the raw materials and the quantities used. It can therefore be taken into account directly in life cycle assessments. In EPD the amount of CO2 rebound for the use phase B1 is specified. Plasters, panels, coatings, etc. influence the recarbonation of wall‐building materials and must be taken into account in the LCA for constructions with CSU. [ABSTRACT FROM AUTHOR]