Fractal Characterization of Non-Uniform Corrosion of Steel Bars in Concrete Beams after Accelerated depassivation and Seven-Year Natural Corrosion
Abstract
:1. Introduction
2. Experiment Program
2.1. Materials
2.2. Specimen Preparation and Experiment Procedure
2.3. Data Acquisition
3. Results and Discussion
3.1. Cross-Section Area Distribution
3.2. Fractal Analysis
3.2.1. Fractal Dimension Calculation
3.2.2. Influence of Loading Condition on Corrosion
3.2.3. Influence of Slag on Non-Uniformity of Corrosion
3.2.4. Relationship between Corrosion Rate and Fractal Dimension
4. Conclusions
- The non-uniformity of corrosion along a reinforcement bar can be expressed by the fractal dimension; the smaller the fractal dimension is, the higher the non-uniform corrosion degree will be.
- The load level has a slight influence on corrosion level and it has some influence on non-uniform corrosion along the reinforcement bar embedded in the ordinary reinforced concrete beam. A larger load level will result in a higher corrosion level for the CO group. Meanwhile, the incorporation of mineral powder helps to reduce the corrosion level and the non-uniformity of corrosion.
- The loading zone leads to different stress states, which induces non-uniform corrosion along the reinforcement bar. The average loss fraction of cross-sectional area and non-uniform corrosion degree in the pure bending tension zone are generally higher than that in the tension–shear zone.
- In this case, there is a positive proportion correlation between the average loss fraction of cross-sectional area and the non-uniformity of corrosion along the reinforcement bar.
Author Contributions
Funding
Conflicts of Interest
References
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Mineral Composition | C3S | C2S | C3A | C4AF | Gypsum |
---|---|---|---|---|---|
Content | 55.5 | 19.1 | 6.5 | 10.1 | 5.0 |
Composition | C | Si | Mn | P | S | Ceq 1 |
---|---|---|---|---|---|---|
HRB335 | 0.25 | 0.80 | 1.60 | 0.045 | 0.045 | 0.52 |
HPB235 | 0.22 | 0.30 | 0.65 | - | - | - |
ID | Water-to-Binder Ratio | Cement | Slag | Water | Fine Aggregate | Coarse Aggregate | Compressive Strength (MPa) |
---|---|---|---|---|---|---|---|
CO | 0.53 | 370 | 0 | 188 | 750 | 1112 | 50.6 |
CS | 0.53 | 185 | 185 | 188 | 750 | 1112 | 45.9 |
Concrete Type | CO | CS | CO | CS | CO | CS |
---|---|---|---|---|---|---|
Proportion of ultimate load Specimen label | 0 | 0 | 10% | 10% | 30% | 30% |
L1-1 | L2-1 | L3-1 | L4-1 | L5-1 | L6-1 | |
L1-2 | L2-2 | L3-2 | L4-2 | L5-2 | L6-2 |
Specimen Label | L1-1 | L1-2 | L3-1 | L3-2 | L5-1 | L5-2 |
Minimum area for 0 to 400 mm | 76.6446 | 76.4769 | 76.5054 | 76.0669 | 76.5907 | 74.9835 |
Average area for 0 to 400 mm | 79.1380 | 79.8435 | 79.0787 | 79.2229 | 79.0090 | 78.9721 |
Minimum area for 400 to 600 mm | 77.0756 | 76.2574 | 76.4212 | 75.5797 | 76.0123 | 76.2791 |
Average area for 400 to 600 mm | 79.3444 | 77.6694 | 78.8420 | 79.0306 | 78.7470 | 78.8357 |
Specimen Label | L2-1 | L2-2 | L4-1 | L4-2 | L6-1 | L6-2 |
Minimum area for 0 to 400 mm | 76.3492 | 76.6179 | 76.5348 | 76.8448 | 76.1551 | 76.7400 |
Average area for 0 to 400 mm | 79.4435 | 79.8534 | 79.3082 | 79.3085 | 79.2173 | 79.0386 |
Minimum area for 400 to 600 mm | 76.3812 | 76.9876 | 76.2062 | 76.6481 | 75.9862 | 76.3994 |
Average area for 400 to 600 mm | 78.7362 | 78.0063 | 79.1747 | 79.0640 | 78.5557 | 78.8741 |
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Jiang, H.; Jin, N.; Ye, H.; Tian, Y.; Jin, X.; Zeng, Q.; Yan, D.; Xu, X. Fractal Characterization of Non-Uniform Corrosion of Steel Bars in Concrete Beams after Accelerated depassivation and Seven-Year Natural Corrosion. Materials 2019, 12, 3919. https://doi.org/10.3390/ma12233919
Jiang H, Jin N, Ye H, Tian Y, Jin X, Zeng Q, Yan D, Xu X. Fractal Characterization of Non-Uniform Corrosion of Steel Bars in Concrete Beams after Accelerated depassivation and Seven-Year Natural Corrosion. Materials. 2019; 12(23):3919. https://doi.org/10.3390/ma12233919
Chicago/Turabian StyleJiang, Haoyu, Nanguo Jin, Hailong Ye, Ye Tian, Xianyu Jin, Qiang Zeng, Dongming Yan, and Xin Xu. 2019. "Fractal Characterization of Non-Uniform Corrosion of Steel Bars in Concrete Beams after Accelerated depassivation and Seven-Year Natural Corrosion" Materials 12, no. 23: 3919. https://doi.org/10.3390/ma12233919