AktivPuzzolan - reduction of the CO2 emission for cements

Hochschule Bonn-Rhein-Sieg
Due to the high specific CO2 emission during the production of Portland cements this in sector is responsible for about 8% of the global emission.

Project description

The aim of this project is make use of clinker reduced Portland cements in order to reduce the energy input during production and therfore also the CO2 emission. This is realised via a syergetic activation of puzzolans. Using the metacaolin Metaver could reduce the Portland cement input by 25% without a considerable reduction of the resulting bending tensile strength. Only the compressive strength lowered about 10 - 15%. Conducting Life-Cycle-Assesments already during the project made it possible to take an immediate impact on the costs and the Global Warming Potential (GWP).


Project manager at H-BRS

Prof. Dr Steffen Witzleben

Professor for Inorganic and Analytical Chemistry
Hochschule Bonn-Rhein-Sieg
steffen.witzleben [at] h-brs.de


  • F. Lebendig, S. Witzleben, Jahrestagung Deutsche Bauchemie, Untersuchung des Einflusses von Chitosan auf das Abbindeverhalten von Portlandzement, 2014
  • A. Leiendecker, V. van Laack, S. Witzleben, Jahrestagung Deutsche Bauchemie, Templatgesteuerte Kristallisation von Zement- Modellverbindungen, 2014

  • M. Thelen, S. Wirtz, S. WITZLEBEN, , Jahrestagung Deutsche Bauchemie, Thermische und mechanische Behandlung von Zementersatzstoffen und deren Einfluss auf die Kristallphasenbildung von Portlandzementklinker, 2014

  • M. Mupa , C.B. Hungwe, S. Witzleben, C. Mahamadi, N. Muchanyereyi (2015). Extraction of silica gel from Sorghum bicolour (L.) moench bagasse ash. African Journal of Pure and Applied Chemistry, 9(2), 2015, 12-17.

  • A. Leiendecker, M. Schulze M, E. Tobiasch, S. Witzleben, Template- mediated Biomineralization for Bone Regeneration. Submitted to Current Stem Cells Research & Therapy, Bentham Science.

Co-operation partners