International Xella Colloquium
Mineral building materials for
Climate-Friendly Construction

Berlin Palace – Humboldt Forum

If not now, when?
Seizing the chance to decarbonise the construction industry


Impressions from the International Xella Colloquium 2022

We would like to thank all guests, speakers and contributors.


Our key topics

In autumn 2022 the Xella Technologie- und Forschungsgesellschaft mbH is organising a one-day scientific and technical colloquium devoted to the subject of Mineral building materials for climate-friendly construction.

The colloquium addresses the role of the Autoclaved Aerated Concrete (AAC) and Calcium Silicate Masonry Unit (CSU) industry in the transition towards a decarbonized built environment.

  • start at
    09:00 am
  • Torsten Schoch, Xella Technologie- und Forschungsgesellschaft mbH
  • Christophe Clemente, Xella Group
  • Hans-Dieter Hegner, Stiftung Humboldt Forum im Berliner Schloss
    “The Humboldt Forum in the Berlin Palace – at the cultural and sustainable heart of Berlin”
  • Henning Ellermann, Deutsche Unternehmensinitiative Energieeffizienz e.V. (DENEFF)
    “Do’s and Don’ts for Whole Life Carbon in the Building Sector”
  • Dr. Stephen Richardson, World Green Building Council
    “Reorienting Capital Flows: Can the EU Taxonomy Help Decarbonise the Building Sector?”
  • Hildegard Bentele, European Parliament
    “The European Green Deal”
  • 10:50 am Coffee-Break
  • Decarbonisation of raw materials, circularity and recarbonatisation
  • start at
    11:20 am
  • Dr. Volker Thome, Fraunhofer-Institute for Building Physics, Germany
    “Innovative Recycling Approaches to Enable New Material Loops for Autoclaved Aerated Concrete”
  • Dr. Oliver Kreft, Xella Technologie- und Forschungsgesellschaft mbH, Germany
    “Circular Economy's Potential to Reduce Autoclaved Aerated Concrete Carbon Emissions”
  • Dr. Peter Stemmermann, Karlsruher Institute of Technology, Germany
    “Belite Cement Clinker from Autoclaved Aerated Concrete – a Contribution towards CO2-Reduced Circular Building Materials”
  • Dr. Hartmut Walther, Xella Technologie- und Forschungsgesellschaft mbH, Germany
    “Forced Carbonation – a New Method to Determine the Degree of Recarbonation of Calcium Silicate Masonry Units”
  • Julius Schäufele, Concular GmbH, Germany
    “How to Achieve Circularity in the Building Sector?”
  • 1:25 pm Lunch at Bistro Lebenswelten, Humboldt Forum
    Bistro Lebenswelten
  • Decarbonisation of the manufacturing of AAC and CSU
  • start at
    2:25 pm
  • Chadwick Chen, Anhui Keda Industrial Co., Ltd (Keda Suremaker), China
    “Evaluation Framework of Decarbonization Technologies for the Autoclaved Aerated Concrete Production”
  • Andreas van Briel, Xella Building Materials, Netherlands
    “Reduction of CO2 Emissions in the Calcium Silicate Masonry Unit Production”
  • Sustainability at building level
  • start at
    3:15 pm
  • Prof. Dr.-Ing. habil. Thomas Lützkendorf, Karlsruher Institute of Technology, Germany
    “Life Cycle Assessments of Building Materials within the Framework of the Construction Products Regulation (CPR) in Europe”
  • Prof. Dr. Natalie Eßig, Munich University of Applied Sciences, Germany
    “Sustainable Buildings and Certification – We Have to (Re)think and (Re)act!”
  • 04:30 pm Coffee-Break
  • Global differences & challenges of sustainable construction with AAC and CSU
  • start at
    5:00 pm
  • Dr. Alexander Röder, Institut Bauen und Umwelt e. V., Germany
    “The Role of Environmental Product Declarations (EPDs) for Decarbonizing our Built Environment”
  • Chadwick Chen, Anhui Keda Industrial Co., Ltd (Keda Suremaker), China
    “Sustainable Green Building Development in China”
  • Dr.-Ing. Wolfgang Eden, Bundesverband Kalksandstein Industrie e. V., Germany
    “The German Calcium Silicate Masonry Industry's Path to Climate Neutrality”
  • Robert Turski, European Autoclaved Aerated Concrete Association
    “The EAACA Net-Zero Roadmap forAutoclaved Aerated Concrete”
  • 6:40 pm Torsten Schoch, Xella Technologie- und Forschungsgesellschaft mbH

After the event

  • 7:00 pmDinner at Käfer Rooftop Restaurant, Berlin
    Käfer Rooftop Restaurant


Meet our experts


Come to Humboldt Forum

Humboldt Forum, Berlin Palace Schlossplatz 1, 10178 Berlin, DE
open in Google Maps

The colloquium took place on the first floor in room 003. Please use Portal 1 for access. The way is signposted.