This special volume of the Materials Science of Concrete includes all papers to be presented at the Diamond Symposium. It comprises the latest scientific results on chemistry and microstructure of cements and concrete. The topics covered include: Chemical and physical aspects of mechanisms of hydration of cements, Development of concrete microstructure and mechanical properties, and various aspects of mechanisms of concrete deterioration, including alkali-silica reaction (ASR) , freezing-thawing, and corrosion of reinforcement. The worldwide communities of specialists in cement production and use, concrete producers and users, and researchers will find this special volume particularly valuable. It is also of great interest to instructors and students in Civil Engineering and Materials Science programs, as well as the state/provincial Department of Transportation in North America, and federal agencies (FHWA, NIST,NRC,DOD,etc.).