Supersulphated cement from blastfurnace slag and chemical gypsum available in the Netherlands and neighbouring countries

The present report covers research into the mechanical strength development and the surface hardness of supersulphated cement from blastfurnace slag, chemical gypsum and portland clinker. The tests were carried out on sand/cement mortar as well as on concrete. A comparison was made with a type of supersulphated cement which was in the market until recently, and with portland and blastfurnace cement. A review has been made of the effects of the hardening temperature, the relative humidity, the degree of grinding of the cement, the use of a water-reducing additive, and treatment with a curing compound. The conclusion is drawn that one of the cements produced, consisting of 83% m/m Dutch blastfurnace slag, 15% m/m fluorogypsum (anhydrite) and 2% m/m portland clinker ground to the relatively high specific surface of 500 m²/kg, is not inferior to blastfurnace cement as regards the properties examined.