Portland slag cement
Under Portland slag cement (historical name Eisenportlandzement ) refers to an artificial building material. It is made up of cement clinker and blast furnace slag . In order to be able to speak of iron Portland cement, the content of cement clinker must be at least 70% and that of the blast furnace slag at a maximum of 30%. If the proportion of slag is greater than 30%, it is called blast furnace cement . The use of slag serves on the one hand to conserve resources, on the other hand it has a positive effect on the properties of the cement for use in hydraulic engineering.
Portland slag cement was used for the first time by Godhard Prüssing in his Vorwohle cement works in 1882. At that time, this addition violated the “Purity Law” set by the Association of German Cement Manufacturers. After many years of scientific and economic disputes, the cement, known as iron Portland cement since 1901, was standardized in 1909 (today shown in EN 197 for normal cement ).
literature
- Iron Portland cement. About the production and use of iron Portland cement. Verlag Stahleisen, Düsseldorf 1914.
- Otto Lueger : Lexicon of the entire technology and its auxiliary sciences. Volume 9, Stuttgart / Leipzig 1914, pp. 230-231.