Abstract
Abstract The issue of a European Community directive aimed at removing trade barriers to a variety of products, among them cement, led to the setting up of CEN/TC 51 as well as the preparation of a series of standards (EN 196) concerning test methods. These were adopted by CEN and later by ISO and are compared to ASTM standards. The release in 1988 of a further European directive dealing specifically with construction products required a new approach from CEN/TC 51's work towards cement definition, composition, specifications, and conformity criteria. The contents of the prestandard ENV 197-1 for common cements is described. At the same time, a tentative comparison is made of this prestandard and ASTM standards. Information is also given about future work planned with regard to common cements (possible additional performance criteria) and special cements.
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