Concrete cracking is usually attributed to thermal deformation, autogenous shrinkage, and drying shrinkages etc. Even though Expansive agent was adopted for a trial to compensate for the shrinkages, for a purpose of preventing the cracking, it was obvious that the expansive agent cannot always work well. In this study, the cracking sensitivity was evaluated by experiments of measuring full restraint stress, and free deformation were decomposed into thermal and non-thermal deformations. It was found that the expansive concrete adopting M type aggregate has a high performance on resisting cracking.

Keywords: Thermal deformation, Autogenous shrinkage, Drying shrinkage, Expansive agent, Avoiding cracking.