This book introduces the characterization of geomaterials at multiple scales. It presents and combines material characterization methods, experimental techniques for the determination of microstructure and mechanical analysis, computational and numerical techniques for multiscale modelling, and bridging scale methods. This is the first book to systematically discuss the advantages and disadvantages of multiscale modelling methods applied to geomaterials, and presents seven applications of the methods to problems in aggregates, asphalt concrete and hydrated cement concrete It serves as a reference for researchers, scientists and civil engineers, as well as a graduate textbook, with advanced tools for characterizing material structure and performing mechanical analysis. It provides a broad literature review and presentation of innovative approaches to research and development.