Rehabilitation of Corrosion-Defected RC Beam-Column Members Using Patch Repair Technique
Abstract
:1. Introduction
2. Experimental Program
2.1. Specimen Details
2.2. Material Properties
2.3. Accelerated Corrosion Process
2.4. Patch Repair Technique
2.5. Test Setup
3. Experimental Results and Discussion
3.1. Actual Degree of Corrosion
3.2. Load-Deflection Response and Cracking Pattern
3.2.1. Specimens in Group A
3.2.2. Specimens in Group B
3.3. Concrete Strain
3.3.1. Specimens in Group A
3.3.2. Specimens in Group B
3.4. Ductility
4. Conclusions
- After a period eight days and thirty-two days of accelerated corrosion, real corrosion degrees of 5.5% and 20.7%, respectively, were evidenced, thus the predicted corrosion level of Faraday’s law was suitable to find the corrosion period in the reinforced concrete under accelerated corrosion.
- Significant deteriorations in the ultimate strength, the serviceability and the ductility were recorded due to the reduction in the mechanical properties of corroded steel bars, such as a reduction in the tensile strength, the bond strength, and the ductility.
- Compared with the control specimens, there were significant reductions 6%, and 4% in the ultimate flexural capacities for low corrosion levels and reductions of 37%, and 34% for high corrosion levels under axial forces of 15 kN, and 30 kN, respectively.
- A significant deterioration in the serviceability limit state in terms of mid span deflection was recorded and exceeded the allowable limit of the ACI code.
- A significant deterioration in the ductility was recorded, thus the ductility for specimens with low corrosion levels was decreased by about 19% and 15%; for specimens with high corrosion levels, the ductility was decreased by about 42% and 33%, compared with the control specimens subjected under 15 kN and 30 kN of axial force, respectively.
- When applying patch repair techniques on the defected specimens, the problem of corrosion reinforcement could be overcome with different levels of efficiency, which then enabled the restoration of the structural integrity.
- By applying patch repair by cleaning steel bars for a specimen with a low-corrosion degree, a significant amount of the load-bearing capacity could be restored.
- Patch repair by replacing steel bars for a specimen with a high-corrosion degree almost completely restored the load-carrying capacity.
- Serviceability of the defected/rehabilitated steel bars after patch repair by cleaning or replacing was restored to the allowable limit of ACI code.
- The concrete strain and the ductility were restored to undamaged states when using a patch repair by replacing corroded steel bars.
- The increase of the axial force for the defected specimens was shown to reduce the adverse effects of corrosion in regard to ultimate strength, stiffness, serviceability, and ductility of RC beam-column members.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Groups | Symbol of * Specimens | Degree of Corrosion (%) | Rehabilitation Technique | Axial Force (kN) |
---|---|---|---|---|
A | BC.C0.RN.A15 | 0 | Non | 15 |
BC.C5.RN.A15 | 5 | Non | 15 | |
BC.C20.RN.A15 | 20 | Non | 15 | |
BC.C5.RCS.A15 | 5 | cleaning corroded bars | 15 | |
BC.C20.RRS.A15 | 20 | replacing corroded bars | 15 | |
B | BC.C0.RN.A30 | 0 | Non | 30 |
BC.C5.RN.A30 | 5 | Non | 30 | |
BC.C20.RN.A30 | 20 | Non | 30 | |
BC.C5.RCS.A30 | 5 | cleaning corroded bars | 30 | |
BC.C20.RRS.A30 | 20 | replacing corroded bars | 30 |
Initial Mass of Non-Corroded Bar Wi, (g) | Final Mass of Corroded Bar Wf, (g) | Desired Degree of Corrosion (%) | Actual Degree of Corrosion CD, (%) |
---|---|---|---|
270 | 255 | 5 | 5.5 |
270 | 214 | 20 | 20.7 |
Groups | Symbol of Specimens | Degree of Corrosion CD (%) | Ultimate Load PU, kN | Mid-Span Service Deflection, mm | Allowable Deflection ACI-318 [21], mm |
---|---|---|---|---|---|
A | BC.C0.RN.A15 | 0 | 68 | 3.6 | 3.9 |
BC.C5.RN.A15 | 5 | 64 | 4 | 3.9 | |
BC.C20.RN.A15 | 20 | 43 | 5.1 | 3.9 | |
BC.C5.RCS.A15 | 5 | 65 | 3.8 | 3.9 | |
BC.C20.RRS.A15 | 20 | 67 | 3.7 | 3.9 | |
B | BC.C0.RN.A30 | 0 | 73 | 3.5 | 3.9 |
BC.C5.RN.A30 | 5 | 70 | 3.9 | 3.9 | |
BC.C20.RN.A30 | 20 | 48 | 4.5 | 3.9 | |
BC.C5.RCS.A30 | 5 | 71 | 3.7 | 3.9 | |
BC.C20.RRS.A30 | 20 | 72 | 3.6 | 3.9 |
Groups | Symbol of Specimens | Ultimate Deflection, ∆u (mm) | Yielding Deflection, ∆y (mm) | Ductility Index µduc. (∆u/∆y) |
---|---|---|---|---|
A | BC.C0.RN.A15 | 17 | 6.5 | 2.6 |
BC.C5.RN.A15 | 13 | 6.8 | 2.1 | |
BC.C20.RN.A15 | 8 | 5.2 | 1.5 | |
BC.C5.RCS.A15 | 14 | 7 | 2.3 | |
BC.C20.RRS.A15 | 18 | 6.5 | 2.7 | |
B | BC.C0.RN.A30 | 16 | 5.9 | 2.7 |
BC.C5.RN.A30 | 16 | 7 | 2.3 | |
BC.C20.RN.A30 | 10 | 5.5 | 1.8 | |
BC.C5.RCS.A30 | 17 | 7.1 | 2.4 | |
BC.C20.RRS.A30 | 19 | 6.7 | 2.8 |
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A. Alwash, N.; M. Kadhum, M.; M. Mahdi, A. Rehabilitation of Corrosion-Defected RC Beam-Column Members Using Patch Repair Technique. Buildings 2019, 9, 120. https://doi.org/10.3390/buildings9050120
A. Alwash N, M. Kadhum M, M. Mahdi A. Rehabilitation of Corrosion-Defected RC Beam-Column Members Using Patch Repair Technique. Buildings. 2019; 9(5):120. https://doi.org/10.3390/buildings9050120
Chicago/Turabian StyleA. Alwash, Nameer, Mohammed M. Kadhum, and Ahmed M. Mahdi. 2019. "Rehabilitation of Corrosion-Defected RC Beam-Column Members Using Patch Repair Technique" Buildings 9, no. 5: 120. https://doi.org/10.3390/buildings9050120
APA StyleA. Alwash, N., M. Kadhum, M., & M. Mahdi, A. (2019). Rehabilitation of Corrosion-Defected RC Beam-Column Members Using Patch Repair Technique. Buildings, 9(5), 120. https://doi.org/10.3390/buildings9050120