Effects of Water Exposure on the Interfacial Bond between an Epoxy Resin Coating and a Concrete Substrate
Abstract
:1. Introduction
2. Research Significance
3. Experimental Investigation
3.1. Materials and Test Variables
3.2. Substrate Concrete and Composite Sample Fabrication
- Substrate concrete test pieces were cast as depicted in Figure 3a.
- At 24 h after casting, the test pieces were demolded and placed in a steam curing chamber.
- Within two days of casting, the concrete surface was roughened with high pressure water jetting, as shown in Figure 3b, and placed back in the chamber.
- Epoxy resin and a hardener were mixed for 2 to 5 min, which was well within the pot life of all the resins.
- Each coating was applied to the surface of concrete specimens in a cylindrical tank filled with tap water.
- Coated concrete specimens were then immediately moved to a curing tank filled with tap water and cured for 24, 48, or 72 h.
- After each curing time, specimens were taken out of the water tank for measurement of their coating thickness and pull-off bond strength.
3.3. Test and Measurement
4. Test Results and Discussion
4.1. Effects of Coating Material on Measured Thickness and Bond Strength
4.2. Effects of Coating Equipment on Measured Coating Thickness and Bond Strength
4.3. Effects of Water Exposure Time on the Measured Coating Thickness and Bond Strength
4.4. Relationship between Thickness and Bond Strength
4.5. Discussion
5. Conclusions
- The effects of coating type on the measured thickness and bond strength values were not explicit and the bond strength values varied depending on the manufacturer.
- The effects of the selected coating equipment on the measured thickness and bond strength values were clear. The paint roller yielded a better bond performance than other tools.
- The effect of underwater curing time on the interfacial bond between the applied coating and substrate was not clearly observable within 72 h; hence, longer exposure periods are needed for future research.
- The bond strength values ranged between 0.1 MPa and 4.0 MPa when coating thickness values were less than 0.8 mm, and the bond strength tended to decrease with increasing coating thickness.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Epoxy Resin Coating (Code) | Mix Ratio (Resin:Hardener) | Density (g/cm3) | Bond Strength (MPa) (Measured Using Steel Plate) |
---|---|---|---|
C1 | 5:1 | 1.82 | 17.0 |
C2 | 5:1 | 1.55 | 6.9 |
C3 | 1.75:1 | 1.75 | 12.7 |
C4 | 5.1:1 | 1.60 | 16.6 |
C5 | 2.77:1 | 1.21 | N/A |
C6 | 2:1 | N/A | N/A |
Concrete Mix Proportion | Compressive Strength | Splitting Tensile Strength | ||||
---|---|---|---|---|---|---|
Water (kg/m3) | Cement (kg/m3) | Fine Aggregate (kg/m3) | Coarse Aggregate (kg/m3) | Water Reducer (kg/m3) | f’c (MPa) | f’sp (MPa) |
83 | 340 | 325 | 451 | 5.0 | 82.3 | 5.1 |
Element | Unit | Seawater | Tap Water |
---|---|---|---|
Calcium (Ca) | ppm | 389 | 90 |
Chloride (Cl) | 18,759 | 44 | |
Iron (Fe) | 0.5121 | - | |
Potassium (K) | 329 | 6 | |
Magnesium (Mg) | 1323 | 6 | |
Sodium (Na) | 9585 | 26 | |
Sulfate (SO42−) | 831 | 8 | |
Nitrate (NO3) | 0.1345 | 1 | |
Salinity | ppt | 35 | less than 0.5 |
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Won, B.; Kim, M.O.; Park, S.; Yi, J.-H. Effects of Water Exposure on the Interfacial Bond between an Epoxy Resin Coating and a Concrete Substrate. Materials 2019, 12, 3715. https://doi.org/10.3390/ma12223715
Won B, Kim MO, Park S, Yi J-H. Effects of Water Exposure on the Interfacial Bond between an Epoxy Resin Coating and a Concrete Substrate. Materials. 2019; 12(22):3715. https://doi.org/10.3390/ma12223715
Chicago/Turabian StyleWon, Boreum, Min Ook Kim, Sangmin Park, and Jin-Hak Yi. 2019. "Effects of Water Exposure on the Interfacial Bond between an Epoxy Resin Coating and a Concrete Substrate" Materials 12, no. 22: 3715. https://doi.org/10.3390/ma12223715