2024-03-29T10:46:25Z
https://u-ryukyu.repo.nii.ac.jp/oai
oai:u-ryukyu.repo.nii.ac.jp:02005605
2022-10-31T02:48:55Z
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コンクリート中の鉄筋の腐食による付着性状の変化 (1)
The Bond Behavior of Corroded Reinforcing Bars in Concrete, 1
和仁屋, 晴讙
具志, 幸昌
伊良波, 繁雄
Waniya, Haruyoshi
Gushi, Yukimasa
Iraha, Shigeo
open access
Bond
Cracks
Crack width
Deformed reinforcing bars
Electrolysis
Cumulative amount of current
Corrosion
This paper presents the effects of corrosion on bond behavior of reinforcing bars. Pull-out and push-out tests were performed for specimens of 15cm cube with a deformed bar D19 at the center where the bar was electrolytically corroded before the tests. The bond characteristics of specimens with corroded and non-corroded bars are investigated from the test results. The following results are obtained from the test. 1. Initial surface cracks started when the cumulative current of 5 to 8 amp. hrs. was observed and the width ranged from 0 to 0.20mm. 2. Failure pattern of all specimens was splitting failure. 3. Total slip up to failure at free end with an electrolytically corroded bar was 1/5 to 1/10 times the one with a non-corroded bars. Existence of surface cracks due to corrosion of the bar has no effect on the slip. 4. As for the specimens with cumulative current of less than 5 amp. hrs. when no cracks was observed, the bond strength of electrolytically corroded bars (σ_<bk>) was equal to or grater than one of non-corroded (σ_<ba>). 5. The value of σ_<bk> / σ_<bo> dropped to 0.50 for the specimens with relatively small cracks showing cumulative current less than 8 amp. hrs. and scattered in the range of 0.25 to 0.50 for the ones having maximum crack width of 0.20 to 0.60mm where cumulative current of 9 to 17 amp. hrs. was observed. It seems that the variance of these values was caused by the existence of defferent internal cracks. 6. For the specimens reinforced with a spiral bar around the center main bar where cracks obsereved, there was no reduction in bond strength and ductile capacity in bond. It is concluded that the reinforcement with a spiral bar around the center contributed beneficially on splitting bond failure.
紀要論文
琉球大学工学部
1982-09
jpn
departmental bulletin paper
VoR
http://hdl.handle.net/20.500.12000/17672
http://hdl.handle.net/20.500.12000/17672
https://u-ryukyu.repo.nii.ac.jp/records/2005605
0389-102X
AN0025048X
琉球大学工学部紀要
24
47
57
https://u-ryukyu.repo.nii.ac.jp/record/2005605/files/No24p047.pdf