concrete strength classes

The different concrete strength classes are based on the characteristic compressive strength of the concrete. The compressive strength classes are assigned according to the DIN standards - DIN EN 206-1/DIN 1045-2. After 28 days (the concrete is fully cured after 28 days), the concrete is tested for its compressive strength using test specimens and divided into the corresponding compressive strength class. Common strength classes are, for example, C20/25 or class C50/60 (high-strength concrete)