Preface.- Part I. Mechanisms of degradation of cementitious materials in aggressive aqueous environments: General introduction to Part I, by A. Bertron.- Sulfate attack of concrete, by E. Men?ndez, T. Matschei, and F.P. Glasser.- Magnesium attack of cementitious materials in marine environments, by M. Santhanam.- Leaching of cementitious materials by pure water and strong acids (HCl and HNO3), by J. Duchesne and A. Bertron.- Ammonium nitrate...