Steel Corrosion Behavior of Reinforced Calcium Aluminate Cement-Mineral Additions Modified Mortar
Abstract
:1. Introduction
2. Materials and Methods
2.1. Raw Materials
2.2. Specimen Preparation
2.3. Pore Paremeters
2.4. Chloride Corrosion
2.5. Electrochemical Test
2.6. Phase Composition
3. Results and Discussion
3.1. Corrosion Potential of Steel Reinforcement
3.2. Electrochemical Impedance Spectroscopy
3.3. Linear Polarization
3.4. Phase Composition
4. Conclusions
- The electrochemical parameters of calcium nitrate-modified CAC specimens show a slow downward trend within 90 days, earlier than the unmodified CAC specimen. This indicates that calcium nitrate can improve the corrosion resistance of steel reinforcements in CAC mortar. However, slag and limestone powder show adverse effects on the corrosion resistance of steel bars in CAC mortar. The relevant electrochemical parameters drop suddenly at 14 days, leading to early corrosion.
- The NO3-AFm in the calcium nitrate-modified CAC specimen was found to have great chloride-binding ability by generating substantial amount of Friedel’s salt, which improves the chloride resistance of the CAC paste. The CO3-AFm in the limestone powder-modified CAC specimen also can combine with chloride to form Friedel’s salt. However, the chloride-binding ability of C2ASH8 in the slag-modified CAC specimen is poor, and thus not conducive to corrosion resistance of the CAC paste.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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MgO | Al2O3 | SiO2 | P2O5 | SO3 | Cl | K2O | CaO | TiO2 | MnO | Fe2O3 |
---|---|---|---|---|---|---|---|---|---|---|
0.46 | 48.45 | 7.33 | 0.15 | 0.46 | 0.01 | 0.45 | 37.87 | 2.52 | 0.04 | 1.90 |
CA | CA2 | C2AS | CT |
---|---|---|---|
51.12 | 4.31 | 35.15 | 4.86 |
C | Si | Mn | P | S | Ni | Cr | Cu | Fe |
0.140 | 0.180 | 0.330 | 0.0170 | 0.004 | 0.010 | 0.010 | 0.010 | 99.0 |
SiO2 | CaO | Al2O3 | Fe2O3 | MgO | K2O | SO3 | Na2O |
---|---|---|---|---|---|---|---|
32.22 | 39.03 | 17.01 | 0.43 | 7.67 | 0.27 | 2.08 | 0.42 |
CAC | Slag | Limestone | Calcium Nitrate | |
---|---|---|---|---|
CAC | 100 | 0 | 0 | 0 |
SL-30 | 70 | 30 | 0 | 0 |
LS-30 | 70 | 0 | 30 | 0 |
CN-10 | 90 | 0 | 0 | 10 |
Samples | Pore Volume Fraction/% | Porosity/% | Average Pore Diameter/nm | ||
---|---|---|---|---|---|
<100 nm | 100~1000 nm | >1000 nm | |||
CAC | 7.40 | 23.86 | 68.74 | 11.82 | 400.20 |
SL-30 | 16.65 | 26.32 | 57.03 | 13.11 | 79.00 |
LS-30 | 28.32 | 28.97 | 42.71 | 16.63 | 40.90 |
CN-10 | 41.99 | 45.78 | 12.23 | 15.02 | 30.70 |
Samples | Fitting Terms | Immersion Time | ||||||
---|---|---|---|---|---|---|---|---|
1 d | 7 d | 14 d | 28 d | 42 d | 56 d | 90 d | ||
CAC | Rp (KΩ·cm2) | 7.81 | 6.55 | 4.93 | 2.43 | 1.87 | 1.76 | 1.86 |
R2 | 0.84 | 0.83 | 0.86 | 0.89 | 0.93 | 0.94 | 0.94 | |
SL-30 | Rp (KΩ·cm2) | 4.15 | 1.98 | 1.49 | 0.93 | 0.80 | 0.59 | 0.52 |
R2 | 0.79 | 0.81 | 0.85 | 0.93 | 0.93 | 0.94 | 0.95 | |
LS-30 | Rp (KΩ·cm2) | 10.81 | 4.29 | 2.32 | 2.24 | 1.72 | 1.60 | 1.46 |
R2 | 0.84 | 0.90 | 0.92 | 0.92 | 0.92 | 0.92 | 0.93 | |
CN-10 | Rp (KΩ·cm2) | 7.05 | 6.15 | 5.50 | 4.88 | 3.68 | 2.87 | 2.50 |
R2 | 0.90 | 0.92 | 0.89 | 0.89 | 0.90 | 0.93 | 0.91 |
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Wang, Z.; Chen, Y.; Zhu, Z.; Peng, X.; Wu, K.; Xu, L. Steel Corrosion Behavior of Reinforced Calcium Aluminate Cement-Mineral Additions Modified Mortar. Materials 2021, 14, 4053. https://doi.org/10.3390/ma14144053
Wang Z, Chen Y, Zhu Z, Peng X, Wu K, Xu L. Steel Corrosion Behavior of Reinforced Calcium Aluminate Cement-Mineral Additions Modified Mortar. Materials. 2021; 14(14):4053. https://doi.org/10.3390/ma14144053
Chicago/Turabian StyleWang, Zhongping, Yuting Chen, Zheyu Zhu, Xiang Peng, Kai Wu, and Linglin Xu. 2021. "Steel Corrosion Behavior of Reinforced Calcium Aluminate Cement-Mineral Additions Modified Mortar" Materials 14, no. 14: 4053. https://doi.org/10.3390/ma14144053