Corrosion Performance of Nano-TiO2-Modified Concrete under a Dry–Wet Sulfate Environment
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Specimen Preparation
2.3. Dry–Wet Cycle Steps
3. Results and Discussion
3.1. Mass Loss Rate
3.2. Ultrasonic Wave Velocity
3.3. Compressive Strength
3.4. XRD
4. Compression Simulation
4.1. Generation and Servo of Compression Specimens
4.2. Microscopic Parameters of the Specimens
4.3. Analysis of the Simulation Results
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Component | SiO2 | Al2O3 | CaO | Fe2O3 | MgO | SO3 |
---|---|---|---|---|---|---|
Cement | 22.02 | 5.2 | 64.42 | 5.23 | 1.02 | 2.1 |
Properties | Density | Melting Point/°C | Boiling Point/°C | Particle Size/nm |
---|---|---|---|---|
Nano-TiO2 | 4.260 | 1855 | 2900 | 25 |
Group | Cement | Sand | Gravel | Water | Water Reducer | Nano-TiO2 |
---|---|---|---|---|---|---|
Ordinary concrete | 415 | 583 | 1224 | 177 | 4.1 | 0 |
Nano-TiO2-modified concrete | 402.55 | 583 | 1224 | 177 | 4.1 | 12.45 |
Ordinary Concrete | Nano-TiO2 Modified Concrete | |
---|---|---|
Minimum radius/mm | 0.045 | 0.01 |
Maximum radius/mm | 0.075 | 0.075 |
Normal stiffness/N·m−1 | 1 × 109 | 1 × 109 |
Shear stiffness/N·m−1 | 1 × 109 | 1 × 109 |
Friction factor | 0.577 | 0.577 |
Parallel effective modulus/GPa | 28.05 | 28.05 |
Tensile strength/MPa | 25 | 31 |
Cohesion/MPa | 100 | 100 |
Linear effective modulus/GPa | 99.33 | 99.33 |
Parallel effective modulus after dry–wet/GPa | 25 | 10 |
Tensile strength after dry–wet/MPa | 11 | 17 |
Cohesion after dry–wet/MPa | 90 | 80 |
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Xu, C.; Liao, H.-H.; Chen, Y.-L.; Du, X.; Peng, B.; Fernandez-Steeger, T.M. Corrosion Performance of Nano-TiO2-Modified Concrete under a Dry–Wet Sulfate Environment. Materials 2021, 14, 5900. https://doi.org/10.3390/ma14195900
Xu C, Liao H-H, Chen Y-L, Du X, Peng B, Fernandez-Steeger TM. Corrosion Performance of Nano-TiO2-Modified Concrete under a Dry–Wet Sulfate Environment. Materials. 2021; 14(19):5900. https://doi.org/10.3390/ma14195900
Chicago/Turabian StyleXu, Chao, Hao-Hao Liao, You-Liang Chen, Xi Du, Bin Peng, and Tomas Manuel Fernandez-Steeger. 2021. "Corrosion Performance of Nano-TiO2-Modified Concrete under a Dry–Wet Sulfate Environment" Materials 14, no. 19: 5900. https://doi.org/10.3390/ma14195900