Bond strength prediction for reinforced concrete members with highly corroded reinforcing bars

Chung, Lan; Kim, Jang-Ho Jay; Yi, Seong Tae

doi:10.1016/j.cemconcomp.2008.03.006

Cited by 159 publications

(63 citation statements)

References 14 publications

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“…The reason is that stirrups can control the development of cracking and hence increase the confinement of the steel bar. As mentioned above, the bond strength increases initially and decreases rapidly afterward (Al-Sulaimani, Kaleemullah, et al, 1990;Chung et al, 2008). The critical corrosion level after which bond strength begins to decrease by Al-Sulaimani was 0.5 and 1% for pullout specimens and beam specimens, respectively.…”

Section: Effects Of Stirrups On the Degradation Of Bond Strengthmentioning

confidence: 95%

“…It can be concluded from Figure 5 that the critical corrosion level is about 2.5%. Cabrera (1996) and Stanish, Hooton, et al (1999) established linear relationship between bond strength and steel corrosion by regression analysis, while Auyeung et al (2000), Lee et al (2002), Bhargava, Ghosh, et al (2006), andChung et al (2008) used exponent model to describe the degradation of bond strength. In the present paper, the following degradation model is established: where a is the degradation coefficient that is influenced by stirrups and concrete cover and η is corrosion level.…”

Section: Effects Of Stirrups On the Degradation Of Bond Strengthmentioning

confidence: 99%

“…After cracking of concrete cover, the bond strength will decrease because of the reduction of confinement. Many researchers have investigated the degradation of bond strength by experiments and proposed empirical formulas to describe the relationship between bond strength and corrosion level (Auyeung, Balaguru, et al, 2000;Cabrera, 1996;Chung, Jay Kim, et al, 2008;Lee, Noguchi, et al, 2002). However, widely accepted degradation model is still beyond reach because of the difference in experimental details.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Stirrups on Bond Behavior Between Concrete and Corroded Steel Bars

Lin¹,

Zhao²,

Sun³

2014

Proceedings of the 4th International Conference on the Durability of Concrete Structures

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Steel corrosion leads to the deterioration of bond between concrete and steel bars. The serviceability and ultimate strength of concrete elements within RC structures are hence affected. Many researchers have studied the bond behavior of corroded steel bars. However, very few studies have investigated the effects of confinements on the degradation of bond strength. The present paper proposed a new kind of beam specimen based on which the effects of stirrups on degradation of bond were investigated. The test results proved that stirrups can effectively increase the bond strength between concrete and corroded steel bars.

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Section: Effects Of Stirrups On the Degradation Of Bond Strengthmentioning

confidence: 95%

Section: Effects Of Stirrups On the Degradation Of Bond Strengthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Stirrups on Bond Behavior Between Concrete and Corroded Steel Bars

Lin¹,

Zhao²,

Sun³

2014

Proceedings of the 4th International Conference on the Durability of Concrete Structures

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“…The crack width was determined with a crack test instrument (precision of 0.01 mm). After the completion of accelerated corrosion, the corroded reinforced bar was removed from the concrete specimens, cleaned, and then and weighed (Chung et al 2008). …”

Section: Accelerated Corrosion Of Reinforced Concretesmentioning

confidence: 99%

Corrosion Behavior of Steel Bar and Corrosive Cracking of Concrete Induced by Magnesium-Sulfate-Chloride Ions

Jin

Zhao

et al. 2016

ACT

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The evolution of steel bar and corrosive-crack propagation of reinforced concrete in three different solutions including MgSO 4 , Mg 2+ -SO 4 2--Cl − , and seawater were examined using electrochemical impedance spectroscopy. Results showed that seawater had the most serious corrosion effect on steel bar in concrete. MgSO 4 combined with chloride ions could accelerate the damage process of passive film, whereas Mg(OH) 2 and gypsum particles could be produced and deposited on the steel-bar surface to block the diffusion of sulfate and chloride ions into the passive film. The crack propagation of concrete in single chloride environment increased with time linearly, but the existence of MgSO 4 in chloride solution could change the crack-propagation behavior of reinforced concrete from linear to nonlinear. The existence of Ca(OH) 2 in MgSO 4 and MgSO 4 -NaCl solutions could not delay the initial corrosion time but reduce the corrosion rate of steel bar by 60%-85%.

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“…In spite of the advantages of reinforced concrete, corrosion of the steel bar remains its most common durability problem 1 . The most important cause of corrosion initiation of steel bar is the ingress of chloride ions to the steel surface [2][3][4] .…”

Section: Introductionmentioning

confidence: 99%

Corrosion of reinforcing bars embedded in alkali-activated slag concrete subjected to chloride attack

2011

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Steel bar embedded in an alkali-activated slag (AAS) concrete was tested under complete immersion, in 3.5% NaCl solution by weight of the slag. Ordinary Portland cement (OPC) was also tested for comparative purposes and exposed to the same solution. Monitoring of open-circuit potential, polarization resistance measurement and electrochemical impedance spectroscopy (EIS) were used to evaluate the corrosion behavior of steel bar. The corrosion resistances of AAS and OPC concretes were performed at 0, 3, 6, 9 and 12 months. Electrochemical measurements shows that AAS concrete presents passive corrosion behavior the first 3 months, after this period of time, it presents corrosion resistance decreased due to the chlorides presence at the steel/AAS interface. For 0 months immersion (28 days of curing) the AAS and OPC concretes presented a 10% of corrosion probability. After 3 months of immersion the tested AAS and OPC concretes showed similar behavior, the active potentials in the range from −0.2 to −0.6 V vs. Cu/CuSO 4, indicate a 90% probability of corrosion.

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Bond strength prediction for reinforced concrete members with highly corroded reinforcing bars

Cited by 159 publications

References 14 publications

Effects of Stirrups on Bond Behavior Between Concrete and Corroded Steel Bars

Effects of Stirrups on Bond Behavior Between Concrete and Corroded Steel Bars

Corrosion Behavior of Steel Bar and Corrosive Cracking of Concrete Induced by Magnesium-Sulfate-Chloride Ions

Corrosion of reinforcing bars embedded in alkali-activated slag concrete subjected to chloride attack

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