Resistance of Concrete to Chloride Ingress sets out current understanding of chloride transport mechanisms, test methods, and prediction models. It describes basic mechanisms and theories, and classifies the commonly used parameters and their units. Laboratory test methods and in-field applicable test methods, including precision results from inter-laboratory comparison tests, are outlined and fundamentals of models are explained. Guidelines for the practical use of test methods and models are given, including tests for in situ applications.