The proceedings of the Fourth CANMET/ACI International Conference on Durability of Concrete is a large collection (81 papers, two volumes) that deals with all aspects of concrete durability. Subjects include chloride and sulfate attack, freeze-thaw cycling, alkali-aggregate reactions, cathodic protection, and the role of supplementary cementing materials to enhance the durability of concrete. A number of papers deal with the durability of fiber-reinforced concrete and the performance of repaired structures, and several papers discuss methods to predict corrosion of steel in concrete and the service-life of structures.