The determination of the actual class of concrete in monolithic reinforced concrete structures is the most important factor determining the quality and strength of structures. In practice, the actual grade of concrete may differ from the design value. If this difference occurs in the direction of decreasing the actual concrete class, then the normative and design characteristics of concrete, the bearing capacity and rigidity of the structures, respectively, decrease and there is a need to

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... then the structures. Current regulatory documents allow you to determine the actual class of concrete in both continuous and spot inspection of structures. The article discusses specific examples to determine the actual class of concrete and draws conclusions about the rational use of a continuous or selective examination of structures of various types with specific examples.