CEM III — Blast Furnace Cement

Blast furnace cement with 36–95 % blast furnace slag. Reduces CO₂ footprint by up to 65 % compared to conventional Portland cement.

CEM III — blast furnace cement — replaces up to 95 % of clinker with granulated blast furnace slag, a by-product of iron and steel manufacturing. The subgroups: CEM III/A (36–65 % blast furnace slag), CEM III/B (66–80 %), CEM III/C (81–95 %).

Advantages: significant CO₂ savings (up to −65 % vs CEM I), high sulfate resistance, low hydration heat. Ideal for civil engineering, locks, bridge structures. Disadvantages: significantly slower early strength — curing must be extended.

CEM III Blast Furnace Cement | Low-CO₂ Binder — Building Materials Radar