アルカリシリカ反応 ・DEF

[1095] Impacts of Delayed Ettringite Formation on Expansive behavior and Shear Capacity of RC beams

董元翔¹, 上田尚史¹, 中部主暁¹, 石川靖晃² (1.関西大学 2.名城大学)

キーワード：delayed ettringite formation、restraint of rebar、warping deformation、diagonal shear failure

This study investigated on the deformation of RC beams due to Delayed Ettringite Formation (DEF) and their shear capacity degradation. RC beams with different reinforcement ratio, 1.14% and 2.03%, were tested. Because of the rebar restraint, anisotropic DEF swelling phenomenon in RC beams occurred so that warping deformation was observed, and its warping level was related to reinforcement ratio. And as a result of flexural-shear tests, significant decrease of shear capacity was observed, and these results provided insights into structural performances of DEF damaged RC beams.