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摘要:
A total of 96 test specimens with embedded reinforcing bars were strengthened by two layer of transverse CFRP (carbon fiber sheets) after accelerated corrosion. Pullout tests on the specimens were conducted to study the effect of CFRP confinement on the bond behavior between corroded reinforcement and steel fibrous concrete, considering the contributions of different elements, including reinforcing bar types, cover depths, corrosion rates, CFRP confinements, and steel fiber. The failure mechanisms were studied. The test results show that CFRP confinements can make the failure mode of deformed reinforcing bar specimens change from steel fibrous concrete splitting to bar pull-out. The main influencing factors of the ultimate bond strength are reinforcement bar types and cover depths, the ultimate bond strength of deformed reinforcement bar specimens is twice as large as that of plain reinforcement bar specimens, and the ultimate bond strength increases when the cover depth changes from 40mm to 60mm. CFRP is effective on slowing down the bond stress reduction rate and maintaining the bond strength. When the corrosion rate is less than 5%, the ultimate bond strength of corroded steel fibrous concrete specimens increases gradually along with the rise of corrosion rate, and decreases when the corrosion rate is higher than 5%. The steel fiber can increase the bond strength of reinforcement and steel fibrous concrete effectively, and make the descending branch of bond-slip curves much smoother.
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来源 :
China Civil Engineering Journal
ISSN: 1000-131X
年份: 2012
期: 8
卷: 45
页码: 41-47