An experimental study on the bond strength between reinforcement bars and concrete as a function of concrete cover, strength and corrosion level

The effect of corrosion on the bond strength between reinforcement bars and concrete was studied in a series of experiments. An accelerated corrosion method was used to corrode the reinforcement bars embedded in concrete specimens. Pullout tests were performed to develop an empirical model for the u...

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Bibliographic Details
Published in:Cement and concrete research 2012-05, Vol.42 (5), p.643-655
Main Authors: Yalciner, Hakan, Eren, Ozgur, Sensoy, Serhan
Format: Article
Language:English
Subjects:
Applied sciences
Bars
Bond strength (C)
Bond-slip (C)
Bonding strength
Buildings. Public works
Concretes
Concretes. Mortars. Grouts
Corrosion
Corrosion (C)
Corrosion tests
Durability. Pathology. Repairing. Maintenance
Exact sciences and technology
Materials
Pullout test (C)
Reinforced concrete
Reinforcement
Reinforcing steels
Strength
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Summary:The effect of corrosion on the bond strength between reinforcement bars and concrete was studied in a series of experiments. An accelerated corrosion method was used to corrode the reinforcement bars embedded in concrete specimens. Pullout tests were performed to develop an empirical model for the ultimate bond strength by evaluating bond strengths in two different concrete mixes, three concrete cover depths and different mass losses of reinforcement bars after corrosion. Bond-slip relationships for the different corrosion levels were compared. It was found that the relationship between bond strength and concrete strength in uncorroded specimens differed from that of corroded specimens set in high-strength concrete because of brittleness in the corroded specimens, which caused a sudden loss of bond strength. The results revealed that specimens with higher concrete strength levels and corroded reinforcements showed a higher percentage of bond strength degradation due to concrete cracking during the pullout tests.
ISSN:0008-8846
1873-3948
DOI:10.1016/j.cemconres.2012.01.003