Research on Salt Corrosion Resistance of Lithium-Based Protective Coating on Mortar Substrate
Abstract
:1. Introduction
2. Materials and Method
2.1. Raw Materials
2.2. Experimental Programme
2.2.1. Penetration Depth of Free Chloride Ion in a Coated Mortar Matrix
2.2.2. Effect of Sulfate Attack on Coating Treated Mortar Matrix
2.2.3. Study on the Effect of Coating Treatment on Chloride Ion Penetration Resistance of Concrete
2.3. Microscopic Test
SEM Characterization & Testing
2.4. XRD Characterization & Testing
2.5. Mercury Injection Test
3. Results and Discussion
3.1. Penetration Depth of Free Chloride Ion in a Coated Mortar Matrix
3.2. Effect of Sulfate Attack on Coating-Treated Mortar Matrix
3.3. Study on the Effect of Coating Treatment on Chloride Ion Penetration Resistance of Concrete
3.4. Influence of Coating Treatment on Surface Morphology of Cement-Based Materials
3.5. Analysis of Protective Mechanism of Coating on Cement-Based Materials
4. Conclusions
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Test Items | Technical Standard | Test Result |
---|---|---|
Flexural strength at 3 d/MPa | ≥3.5 | 4.6 |
Flexural strength at 28 d/MPa | ≥6.5 | 7.3 |
Flexural strength at 3 d/MPa | ≥17.0 | 19.8 |
Flexural strength at 28 d/MPa | ≥42.5 | 42.9 |
Initial setting time | ≥45 | 110 |
Final setting time | ≤390 | 350 |
Stability | Must be qualified | qualified |
Fineness (80) µm sieve residue (%) | ≤10.00 | 3.79 |
Specific surface area/m2/kg | >300 | 347 |
Chemical Composition | SiO2 | CaO | Fe2O3 | Al2O3 | MgO | Alkali Content | Loss on Ignition |
---|---|---|---|---|---|---|---|
content/% | 20.56 | 60.96 | 4.89 | 5.56 | 2.93 | 0.5 | 1.64 |
ISO 679:2009 [32] | China ISO Standard Sand [33] | ||
---|---|---|---|
Grain Size Specification (µm) | Cumulative Sieving Amount (%) | Grain Size Specification (µm) | Cumulative Sieving Amount (%) |
2000 | 0 | 2000 | 0 |
1600 | 7 ± 5 | 1600 | 7 ± 4 |
1000 | 33 ± 5 | 1000 | 33 ± 4 |
500 | 67 ± 5 | 500 | 67 ± 4 |
160 | 87 ± 5 | 160 | 87 ± 4 |
80 | 99 ± 1 | 80 | 99 ± 1 |
Number | Lithium Silicate | Sodium Silicate | Silica Sol | Sodium Methylsilicate | Silane Coupling Agent | Methyl Silicone Oil | Helper Component |
---|---|---|---|---|---|---|---|
PC1 | 40% | — | — | — | — | — | Surfactants, pH regulators, dispersants, defoamers, film-forming AIDS, etc. |
PC2 | 40% | 10% | — | — | — | — | |
NC1 | 40% | 10% | 30% × PC2 | — | — | — | |
NC2 | 40% | 10% | 30% × PC2 | 5% × PC2 | — | — | |
OL1 | 40% | 10% | — | — | 100% × PC2 | 2% × PC2 |
Quantity of Charge q (in Coulombs) | Chloride Ion Permeability |
---|---|
>4000 | High |
2000–4000 | medium |
1000–2000 | low |
100–1000 | very low |
<100 | could be ignored |
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Zang, J.; Pan, C.; Li, X.; Chen, K.; Chen, D. Research on Salt Corrosion Resistance of Lithium-Based Protective Coating on Mortar Substrate. Materials 2023, 16, 3463. https://doi.org/10.3390/ma16093463
Zang J, Pan C, Li X, Chen K, Chen D. Research on Salt Corrosion Resistance of Lithium-Based Protective Coating on Mortar Substrate. Materials. 2023; 16(9):3463. https://doi.org/10.3390/ma16093463
Chicago/Turabian StyleZang, Jiawei, Chonggen Pan, Xu Li, Keyu Chen, and Danting Chen. 2023. "Research on Salt Corrosion Resistance of Lithium-Based Protective Coating on Mortar Substrate" Materials 16, no. 9: 3463. https://doi.org/10.3390/ma16093463