Composite Portland cement obtained by combined grinding of Portland cement clinker, gypsum stone and composite additive consisting of two mineral components: ash and limestone. Using ash as an aluminosilicate additive and limestone as a carbonate additive, during hydration with Portland cement they react with calcium hydroxide to form silicate crystal hydrates, calcium aluminosilicates and hydroaluminates.
The use of CEM II/V-K (Z-I) 32.5H cement helps to reduce stratification and water separation of concrete mixtures; increase their water-holding capacity; density and homogeneity; reduce shrinkage and heat release of concrete, and also improves their weather resistance.