Your base recipe
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10% more cement in the same mix – the easiest way to noticeably more compressive strength. No special product, available at hardware stores.
Additive from power plant ash. Improves long-term strength, makes concrete denser and slightly more fluid. Available at building material suppliers.
Reduces water demand by approx. 7%, the concrete flows more evenly into the formwork. Available at hardware stores. Excludes flow agent.
Stronger plasticizer: reduces water demand by approx. 20%. For very flowable concrete (F4–F6). Check dosage per product. Excludes concrete plasticizer.
Microsilica makes concrete noticeably stronger and denser. For heavily loaded floors, columns and precast elements. Only available at building material suppliers or online (special product).
Creates fine air pores that prevent frost damage. Important for terraces, driveways and outdoor stairs. Reduces compressive strength by approx. 14 N/mm².