Abstract
Using specimens, in which expansive mortar is cast, experimental tests are performed to simulate the stirrup fractures due to ASR expansion. The time variation of external degradation and its connection to movement of stirrup is studied. The specimens, with greater deformation around 8.0mm in central profile have reproduced the ASR-induced circular deformation. Cracks in external concrete are divided into non-throughout crack due to bending effect and throughout crack from uniform tension and shear. For checking the influence on movement of stirrup from circular deformation, stirrup shapes before and after expansion are recorded. The bended part of stirrups is verified to have opening deformation with angular increment 1.62°. Due to the opening deformation, crack ratio in stirrups is confirmed to progress from initial 2.56% to 17.70% after expansion.
