Microstructure and Mechanical Properties of Cement Mortar Containing Phase Change Materials
Abstract
:1. Introduction
2. Materials and Experimental Method
3. Results and Discussion
3.1. X-ray Diffraction Analysis
3.2. Scanning Electron Microscopy Analysis
3.3. Flow Analysis
3.4. Mechanical Properties
3.5. Semi-Adiabatic Temperature Rise Test
4. Conclusions
- (1)
- The microstructural analysis results show that the crystalloid content of cement mortar without PCM differs by about 3% from the crystalloid content of cement mortar with PCM regardless of the type of PCM used, and not much difference is evident in the formation of crystals between cement mortar with and without PCM. PCM-Ba and PCM-Sr were found to act on the hydration reactions within the cement matrix, generating oxides of Ba-oxide and Sr-oxide in addition to hydration compounds. Also, we found that the cement paste containing Br produced macdonaldite (BaCA4Si16O36(OH)2•10(H2O)).
- (2)
- PCM mix ratios of 3% to 15% do not have much effect on flexibility. We also found that the use of PCM-Sr decreases the workability compared to the PCM-Ba at the same mix percentage.
- (3)
- As the PCM addition rate increases, the bending strength decreases. Although the strength of the bending increases due to the increase in aging, PCM-Ba does not perform well in terms of flexural strength, even in the long term, so PCM-Sr is favorable for the performance in flexure.
- (4)
- The compressive strength evaluation shows a decrease in compressive strength due to the mixing of PCM into cement mortar, and the decrease in initial strength is significant. In addition, PCM-Ba showed a more rapid drop in compressive strength compared to PCM-Sr. Therefore, it is assumed that the application of PCM-Ba will require user review.
- (5)
- The test results show that the temperature increase and maximum temperature release time of PCMs were delayed up to 5% of the mixing ratio. Both PCM-Ba and PCM-Sr are effective in reducing hydration heat development.
Author Contributions
Funding
Conflicts of Interest
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Mix No. | W/C | Cement (g) | Water (g) | Sand (g) | PCM (g) | Test Item | ||||
---|---|---|---|---|---|---|---|---|---|---|
0% | 3% | 5% | 10% | 15% | ||||||
OPC | 0.5 | 450 | 255 | 1350 | – | – | – | – | – | XRD SEM Flow test Flexural test Compressive test |
PCM-Ba | – | 13.5 | 22.5 | 45 | 67.5 | |||||
PCM-Sr | – | 13.5 | 22.5 | 45 | 67.5 | |||||
OPC | 0.5 | 2800 | 1400 | 6860 | – | – | – | – | – | Semi-adiabatic temperature rise test |
PCM-Ba | – | 84 | 140 | 280 | 420 | |||||
PCM-Sr | – | 84 | 140 | 280 | 420 |
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Yun, H.-D.; Lee, J.-W.; Jang, Y.-I.; Jang, S.-J.; Choi, W. Microstructure and Mechanical Properties of Cement Mortar Containing Phase Change Materials. Appl. Sci. 2019, 9, 943. https://doi.org/10.3390/app9050943
Yun H-D, Lee J-W, Jang Y-I, Jang S-J, Choi W. Microstructure and Mechanical Properties of Cement Mortar Containing Phase Change Materials. Applied Sciences. 2019; 9(5):943. https://doi.org/10.3390/app9050943
Chicago/Turabian StyleYun, Hyun-Do, Jong-Won Lee, Young-Il Jang, Seok-Joon Jang, and Wonchang Choi. 2019. "Microstructure and Mechanical Properties of Cement Mortar Containing Phase Change Materials" Applied Sciences 9, no. 5: 943. https://doi.org/10.3390/app9050943
APA StyleYun, H.-D., Lee, J.-W., Jang, Y.-I., Jang, S.-J., & Choi, W. (2019). Microstructure and Mechanical Properties of Cement Mortar Containing Phase Change Materials. Applied Sciences, 9(5), 943. https://doi.org/10.3390/app9050943