Conc!ete or mortar building materials

摘要

Concrete, esp. steel concrete, in which up to about 45% of the usual gravel content is replaced by granulated slag with a grain size of approx. 15 mm, is used as a building material. The comp. of the slag is pref. (% wt.): SiO2 (50-52), Al2O3 (25-28), Fe2O3 (12-15), CaO (4-5) 2Na2O.K2O.MgO (3-5).