Seit einigen Jahren beschäftigen wir uns mit der Frage, wie der CO2-Fußabdruck unserer Produkte verringert werden kann. Gerade bei der Herstellung: Auch wenn für die Herstellung von Porenbeton selbst nur wenig Energie notwendig ist – die Produkte werden bei ca. 180 Grad autoklaviert. Der heutige CO2-Footprint von AAC wird bis zu 80 Prozent von den verwendeten Bindern Zement und Kalk bestimmt. (Wie der Anteil von CO2-intensiven Rohstoffen reduziert wird).
Wenig erforscht war bisher allerdings, inwieweit bei der Nutzung von Gebäuden wiederum große Mengen an CO2 gespeichert werden. Die Xella Technologie und Forschungsgesellschaft hat das in den vergangenen Jahren untersucht und die dazugehörige Studie in dem renommierten AAC Worldwide Magazin veröffentlicht. Ergebnis: Im Prozess der Rekarbonisierung wird ein Großteil des beim Brennen von Zement und Branntkalk freigesetzten CO2 wieder absorbiert und dauerhaft als Karbonatphase in die mineralische Struktur des Porenbetons eingebettet. Lesen Sie die Untersuchung beim AAC Worldwide Magazin.
How buildings made of autoclaved aerated concrete (AAC) and calcium silicate blocks store CO2
For several years now, we have been looking at how large the CO2 footprint of building materials such as autoclaved aerated concrete and calcium silicate blocks really is and how it can be reduced accordingly. A new study by Xella Technologie und Forschungsgesellschaft mbH has shown that large amounts of CO2 are stored during the use of those buildings. What this means for the CO2 balance of building materials.
CO2 balance of AAC decreases significantly
“The study shows on a scientific basis that the use of building materials such as autoclaved aerated concrete is of great importance for climate protection,” says Dr. Hartmut Walther, mineralist and author of the study from Xella Technologie und Forschungsgesellschaft mbH.
And Torsten Schoch, Managing Director of Technologie und Forschungsgesellschaft mbH, puts the results in context: “Take the CO2 balance of a single-family house, over the life cycle of the building, this way the CO2 footprint is reduced by about one third.” For the entire life cycle of a single-family house of around 50 years, there is no difference between mineral and wood construction - building with aerated concrete could now even prove to be more climate-friendly.
CO2 footprint of calcium silicate blocks is reduced
The experts have determined that the situation is similar for calcium silicate blocks. A study published in the German Magazine “Mauerwerk” suggests that the footprint of calcium silicate blocks is also reducing – by nearly 40 percent.
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