A new method for stress estimation of concrete structures using calcite twin piezometer

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This paper proposes a new method to estimate stress of concrete structures. The calcite twin is intra-crystalline deformation that increases with stress, and calcite-twin piezometer has been applied in pure-calcite rock. However, it has been hardly used for polymineralic rocks due to uncertain of inner stress field of a rock. Discrete Element Method (DEM) can simulate deformation of aggregate, and it reveals that mean stress of particle is proportionate with applied force to an aggregate. Increase of calcite-twin with applied-force within a polymineralic material was confirmed by a rock compression experiment. These suggest that the calcite-twin piezometer is applicable to polymineralic materials, and this technique has potential to contribute to safety assessments of concrete structure (Publication of Unexamined Application 2008-286689).