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The European prestandard on common cements, ENV 197, Part 1 , differentiates 5 main types and 25 different varieties. Except for portland cement, all cements are composed of at least two or more main components: clinker, blastfurnace slag, natural or artificial pozzolans, fly ash, silica fume, burnt shale, and pulverized or interground limestone. The proportions differ from 5 to 95% (all percentages by mass) clinker. German experiences with high-quality portland-limestome cements and portland-fly ash-slag cements in concrete show some advantages in workability and the same favorable behavior in strength and durability.
manager, Hcidelberger Zement AG, Leimen,
Professor and director, Hcidelberger Zement AG, Leimen,
research scientist, Hcidelberger Zement AG, Leimen,
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