The work presented here was performed in the context of the French national project CEOS.fr. The study is part of the second axis of the project dealing with the concrete behavior under thermo-hydro-chemo-mechanical (THCM) loads. One of the objectives of this component was to construct some massive structures with strain restraint in order to test and validate THCM model for predicting the early-age cracking of concrete structures. Once validated, this THCM model is used in the last part of the project to perform some numerical parametric studies and a more precise analysis of the effect of the reinforcement on the crack pattern of massive structures at early age.