並列タイトル等Experimental Study on Brittle Fracture of Processing Parts of Rebars in Concrete
一般注記The purpose of this study is to investigate the reasons behind the fracturing of bending part of rebars in ASR concrete, and also to determine the characteristics of the fatigue cycle of pressure-welded rebars in concrete.
The results of this study show that:
(1) The fracturing of rebars subjected to expansion loads in ASR concrete can be attributed to cracks forming in rebars as a result of bending. The rebars are unlikely to fail provided that they are not notched and that the bending radius is at least twice their diameter.
(2) Carbonate stress corrosion cracking (CSCC) of rebars in ASR concrete is likely to occur if the concentration of the carbonate around bending part of rebars is in the range 1.5 mol/L–2.0 mol/L. The cracks of CSCC occurred in a rebar consist of both transgranular and intergranular cracks. The cracks of CSCC were identical to those of rebars failed in the ASR concrete of actual structures.
(3) The fatigue life of pressure-welded rebars in concrete is 1.8 to 4.0 times greater than that of pressure-welded bars in air. The longer fatigue life is a result of the bond stress between rebar and concrete.
学位記番号:工博乙3
identifier:https://gair.media.gunma-u.ac.jp/dspace/handle/10087/10310
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受理日（W3CDTF）2019-08-03T12:23:27+09:00
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