As a bulk material, concrete needs to function in practice and be composed in an energetically balanced manner. The production of the construction material strictly follows the generally accepted rules of technology. Therefore, the specifics of the associated tasks to be solved should neither be underestimated nor overestimated. The two- stage concept, which was developed by the author in this context, and which provides effective procedures for the design of mortar and concrete mix compositions [18] is scientifically justified, is strictly subordinated to the objectives of functionality and cost-effectiveness and withstands every test for ecological sustainability.
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Prof. Dr.-Ing. Jürgen Oecknick, PSA Zurich, Switzerland PSA Zurich Area GmbH Freiestrasse 24a, 8610 Uster, Switzerland juergen.oecknick@psazurich.ch www.psazurich.ch