Alkali silica reaction

[1181] EVALUATION FOR DEFORMATION OF STIRRUPS IN ASR-SIMULATION SPECIMENS

Yulong ZHENG¹, Kenji KOSA¹, Nobuo UEHARA², Jingmin WANG³ (1.九州工業大学 2.住友大阪セメント 3.Kyushu Institute of Technology)

Keywords:ASR, experiment, fracture mechanism, movement of stirrup, アルカリシリカ反応, 実験, 破断メカニズム, 鉄筋の変形

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Using specimen in which expansive mortar is cast, experimental tests simulating ASR are performed. Through observations with time, the general specimen has reproduced the ASR-induced circular deformation. From detailed evaluation, the corner concrete has opening deformation with angular increment around 0.83˚. By recording stirrup shapes before and after expansion, the bent part of stirrups is verified to have angular variation as 1.85˚. The opening deformation of stirrups, with rough correlation to that of concrete, is considered to be influential on stirrup fracture.