To activate the granulated slag to it adds a lime: cement for the main blast and open hearth slag at 10%, from acid-ferrous metallurgy slag, cupola production – 15-20%. Another important area of use granulated slag is used in their manufacture slag Portland cement. The introduction of slag in the cement composition in an amount of 30-50% does not reduce the strength of branding Portland. Moreover, applying the active glassy slag, slag Portland cement plants produce fast setting with high strength – up to 600 kg/cm2. Portland slag cement are widely used in construction practice.
A particularly important role they play in construction of massive waterworks. The fact that the hardening of cement with the addition of slag allocates 1.5-2 times less heat than without the additive, which determines high fracture toughness of concrete sets. Shlakoportlantsementy made by co-grinding in ball mills, pipe Portland cement clinker and granulated slag, the amount of which depends on the type of slag Portland cement. Granular slags are also used for the production of cement shlakoschelochnyh, which are hydraulic binders obtained by fine grinding of granulated slag with alkaline malogigroskopichnym bean or ground slag mixing solutions of compounds of alkali metals: sodium, lithium or potassium. Alkaline components are introduced in an amount of 5-15% by weight of slag in terms of dry matter in the form of compounds of alkali metals in aqueous solutions, which give an alkaline reaction. Shlakoschelochnye cements have several varieties, depending on the composition of the aluminosilicate component: bezdobavochny cement, blended cement or effusive intrusive rocks, clay minerals, burned rocks, alkali-and silicon-containing substances, etc.