Concrete meets its performance requirements when it is easy to process in the fresh stage and can permanentely guarantee the desired strength- and deformation parameters. However, these objectives can represent the modern zeitgeist only if the industrial production of concrete is based on a holistic approach that balances both energetic and ecological parameters. The building material cement bears the essential “burden”, on the one hand as the driving force for the structural matrix formation and hardening processes, and on the other hand as the main ecological weakness of the system. It is therefore not surprising that the globally networked cement industry and its partners are looking for complex solutions to reduce the CO2 footprint [1-3]. In this context, a targeted batch optimization of the multiphase systems cement, mortar and concrete is also proposed as a short-term lever for creating a balance be- tween performance and ecology. It is not the clinker-based Portland cements (OPC) that are to be improved, but the binder types containing supplementary cementitious materials (SCMs) that need to provide a higher application potential and better versatility for the final product. Regardless of the material perspectives that will result from the manufacturing principle of “separate grinding” in the future [4-5], the necessary underlying possibilities have already largely been exhausted both at micro and macro levels. The solution to the problem is supposed to stem from nanoproducts, which have been synthesized for more than 20 years and used in a variety of ways. But even this technology has not yet provided any new impetus for the implementation of high-performance and energy-efficient binders in the construction industry. What are the main reasons for this and what are the expected developments in future?
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Univ.-Prof. Dr.-Ing. Jürgen Oecknick, PSA Zurich, Switzerland PSA Zurich Area GmbH Freiestraße 24a, 8610 Uster, Switzerland juergen.oecknick@psazurich.ch www.psazurich.ch