Newly introduced aspects of durability of engineering structures are handled on the basis of a literature review and research. The applicability of the permeability for the quality control of the concrete cover is determined. The measurement method and numerous measurement results are described and provide information on the evaluation and interpretation of the test results as well as the limits of applicability of the method. The effectiveness of various measures to ensure a sufficient resistance against reinforcement corrosion is based on a parametric study and using a numerical model investigated by the duration of the initiation phase of the chloride.