The IGF project 17930 N of VDZ gGmbH is supported by the AiF within the framework of Industrial Collective Research (IGF) of the Federal Ministry of Economic Affairs and Energy on the basis of a decision of the German Bundestag.
Optimization of cements with natural calcined clays as main constituent and durability of concretes made of these cements
The production of cements with main constituents beside cement clinker is of high interest for the cement industry. The use of cement constituents like ground granulated blast furnace slag and fly ashes is regulated by the standards and state of the art. Nevertheless their limited availability forces the use of alternative supplementary cementitious materials (SCM).
During the finished project „Nutzung von natürlichen getemperten Tonen als Zementhauptbestandteil“ (IGF 16566 N, German only) the suitability of clays of different mineralogical compositions as calcined clays for cements acc. EN 197-1 could be shown. Therefor the new research project focusses on the optimization of pozzolanic cements concerning the processing and composition of their constituents as well as the durability of concretes made of these cements. Within the project clays will be put to account, which are already used for clinker production. Additionally some clays of low ceramic quality known from the former project will be tested.
The research project can be divided into two work packages. During the first optimization possibilities concerning the composition of cements with calcined clays will be shown. The second work package deals with the durability of concretes containing Portland-pozzolana cements and Pozzolanic cements.