Concrete will be the key material for Mankind to create the built environment of the next millennium. The requirements of this infrastructure will be both demanding, in terms of technical performance and economy, and yet be greatly varied, from architectural masterpieces to the simplest of utilities. Controlling Concrete Degradation forms the Proceedings of the one day International Seminar held during the Congress, Creating With Concrete, 6-10 September 1999, organized by the Concrete Technology Unit, University of Dundee. It deals with how to extend the performance of concrete by promoting the use of specialist techniques at the specification and design stage and using such specialist techniques to rehabilitate degrading structures. The themes of the seminar were Controlling Concrete Degradation by intent and by rehabilitation. The 11 volume Creating with Concrete series Creating With Concrete; Modern concrete binders, additions and admixtures; Radical design and concrete practices; Utilizing ready mixed concrete and mortar; Role of interfaces in concrete; Innovation in Concrete Structures; Controlling concrete degradation; Specialist techniques and materials for concrete construction; Extending performance of concrete structures; Concrete durability and repair technology; Exploiting wastes in concrete.