Abstract
In the compliance control of concrete, different types of criterion are in use. In particular, compound criteria are often used since this type of criterion appears in the CEB-FIP Model Code for Concrete Structures. In this paper, the dependency between the minimumvalue and the mean-value criteria is shown not to be negligible. The usefulness of a minimum-value criterion is questioned, as generally it unnecessarily decreases the probability of acceptance for low defective fractions. The preliminary application of an outlier criterion is suggested as a more consistent approach. Finally, criteria of the type\(\bar x_n \geqslant f_{ck} + \lambda s_n \) are proposed, where the numerical values of λ are fixed in such a way that the resulting OC lines are tangent to a continuous boundary line for the unsafe region.
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