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Cements lying within an extensive range of compositions in the ternary system consisting of clinker (K), granulated blastfurnace slag (S) and limestone (LL) were investigated in a research project sponsored by the DBU.Tests were carried out on the durability of concretes made with cements within the composition limits of the currently envisaged extension of DIN EN 197-1 and beyond. It was found that cements with a Portland cement clinker content of about 50 mass % using granulated blastfurnace slag and limestone as the other main constituents are suitable, in principle, for producing structural concretes. These cements gave fresh concrete properties as used in practice, good mechanical properties and, with the exception of freeze-thaw resistance, admissible durability properties within the framework of the currently valid descriptive rules of DIN 1045-2. Concretes made with cements lying outside the range of the currently envisaged extension of DIN EN 197-1 with a Portland cement clinker content of about 20 to 35 mass % with granulated blastfurnace slag and limestone as the other main constituents can also exhibit admissible durability properties provided not only granulometric matching of the main constituents but also exacting concrete technology measures (low-water concrete with low water/cement ratio and corresponding addition levels of admixtures) are applied in the concrete production. [ABSTRACT FROM AUTHOR]