This book provides a State of the Art Report (STAR) produced by RILEM Technical Committee 254-CMS ¿Thermal Cracking of Mas-sive Concrete Structures¿. Several recent developments related to the old problem of understanding/predicting stresses originated from the evolution of the hydration of concrete are at the origin of the creation this technical committee. Having identified a lack in the organization of up-to-date scientific and technological knowledge about cracking induced by hydration heat effects, this STAR aims to provide both practitioners and scientists with a deep integrated overview of consolidated knowledge, together with recent developments on this subject.

Preface.- Acknowledgements.- Introduction, by  Eduardo Fairbairn and Miguel Azenha.- Hydration and heat development, by Laurie Lacarrière, Agnieszka Knoppik, Wilson Ricardo Leal da Silva, Tulio Honorio, Vit Šmilauer, Shingo Asamoto, and Eduardo Fairbairn.- Thermal properties, by Mateusz Wyrzykowski, Agnieszka Knoppik, Wilson R. Leal da Silva, Pietro Lura, Tulio Honorio de Faria, Yunus Ballim, Brice Delsaute, Stéphanie Staquet, and Miguel Azenha.- Mechanical properties, by Farid Benboudjema, Jérôme Carette, Brice Delsaute, Tulio Honorio de Faria, Agnieszka Knoppik, Laurie Lacarrière, Anne Neiry de Mendonça Lopes, Pierre Rossi7, and Stéphanie Staquet.- Mixture proportioning for crack avoidance, by Stéphanie Staquet, Brice Delsaute, Eduardo Fairbairn, Roberto Torrent, Agnieszka Knoppik, Neven Ukrainczyk, and Eduardus A.B. Koenders.- Temperature control, by Miguel Azenha, Ioannis P Sfikas, Mateusz Wyrzykowski, Selmo Kuperman, Agnieszka Knoppik.- Numerical modelling, by Francesco Pesavento, Agnieszka Knoppik, Vit Šmilauer, Matthieu Briffaut, and Pierre Rossi.- Cracking risk and regulations, by Agnieszka Knoppik, Jean-Michel Torrenti, Shingo Asamoto, Eduardus Koenders, Dirk Schlicke, and Luis Ebensperger.- On-site monitoring of mass concrete, by Dirk Schlicke, Fragkoulis Kanavaris, Rodrigo Lameiras , Miguel Azenha.- Sustainability aspects in mass concrete, by Neven Ukrainczyk and Eduardus A.B. Koenders.- Terminology, Symbols and Acronyms.