Pore structure evolution and cracking mechanism of mortar caused by pore vapor pressure during microwave heating
Utilizing microwave heating technology to crush concrete and recycle high-quality aggregates is the most promising concrete recycling technology currently. The essence of microwave-assisted concrete crushing operates by fracturing the mortar matrix. Increasing the moisture content of mortar is an im...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-05-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425013833 |
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| author | Rujia Qiao Zhoufenglin Lei Yuan Yuan Zhushan Shao Shuailing Li Hang Zhang Tengfei Yang |
| author_facet | Rujia Qiao Zhoufenglin Lei Yuan Yuan Zhushan Shao Shuailing Li Hang Zhang Tengfei Yang |
| author_sort | Rujia Qiao |
| collection | DOAJ |
| description | Utilizing microwave heating technology to crush concrete and recycle high-quality aggregates is the most promising concrete recycling technology currently. The essence of microwave-assisted concrete crushing operates by fracturing the mortar matrix. Increasing the moisture content of mortar is an important measure to improve microwave crushing efficiency, but the crushing mechanism needs further research. In this paper, microwave heating tests of mortar with different moisture content were carried out, and the effects of microwave power, heating duration and moisture content on the temperature, mass loss and pore structure evolution of mortar were obtained. It is found that there are two main effects in the microwave heating process: hydrothermal migration and pore vapor pressure cracking. The dominance of the two is significantly affected by microwave heating power and mortar water content. In order to explain the cracking mechanism caused by pore vapor pressure, a single-pore cracking model of mortar was established. The results show that the critical pore vapor pressure for cracking of mortar with initial crack is significantly lower than that for mortar without initial crack. The critical cracking pressure decreases by about 80 % (67 %) in the presence of penetrating crack (surface crack), respectively. This study establishes a theoretical connection between the critical pressure for mortar cracking and the microwave heating parameters. The results can provide theoretical guidance for the parameters optimization of the concrete crushing technology driven by microwave heating. |
| format | Article |
| id | doaj-art-6e9986465a7e4d52999b77b47ea6cc3c |
| institution | OA Journals |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj-art-6e9986465a7e4d52999b77b47ea6cc3c2025-08-20T02:02:17ZengElsevierJournal of Materials Research and Technology2238-78542025-05-0136103521036510.1016/j.jmrt.2025.05.227Pore structure evolution and cracking mechanism of mortar caused by pore vapor pressure during microwave heatingRujia Qiao0Zhoufenglin Lei1Yuan Yuan2Zhushan Shao3Shuailing Li4Hang Zhang5Tengfei Yang6School of Science, Xi'an University of Architecture & Technology, Xi'an, 710055, China; Corresponding author.School of Science, Xi'an University of Architecture & Technology, Xi'an, 710055, ChinaSchool of Science, Xi'an University of Architecture & Technology, Xi'an, 710055, ChinaSchool of Science, Xi'an University of Architecture & Technology, Xi'an, 710055, China; Corresponding author.School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, ChinaSchool of Science, Xi'an University of Architecture & Technology, Xi'an, 710055, ChinaSchool of Science, Xi'an University of Architecture & Technology, Xi'an, 710055, ChinaUtilizing microwave heating technology to crush concrete and recycle high-quality aggregates is the most promising concrete recycling technology currently. The essence of microwave-assisted concrete crushing operates by fracturing the mortar matrix. Increasing the moisture content of mortar is an important measure to improve microwave crushing efficiency, but the crushing mechanism needs further research. In this paper, microwave heating tests of mortar with different moisture content were carried out, and the effects of microwave power, heating duration and moisture content on the temperature, mass loss and pore structure evolution of mortar were obtained. It is found that there are two main effects in the microwave heating process: hydrothermal migration and pore vapor pressure cracking. The dominance of the two is significantly affected by microwave heating power and mortar water content. In order to explain the cracking mechanism caused by pore vapor pressure, a single-pore cracking model of mortar was established. The results show that the critical pore vapor pressure for cracking of mortar with initial crack is significantly lower than that for mortar without initial crack. The critical cracking pressure decreases by about 80 % (67 %) in the presence of penetrating crack (surface crack), respectively. This study establishes a theoretical connection between the critical pressure for mortar cracking and the microwave heating parameters. The results can provide theoretical guidance for the parameters optimization of the concrete crushing technology driven by microwave heating.http://www.sciencedirect.com/science/article/pii/S2238785425013833Microwave heatingMortarVapor pressurePore structure evolutionCracking mechanism |
| spellingShingle | Rujia Qiao Zhoufenglin Lei Yuan Yuan Zhushan Shao Shuailing Li Hang Zhang Tengfei Yang Pore structure evolution and cracking mechanism of mortar caused by pore vapor pressure during microwave heating Journal of Materials Research and Technology Microwave heating Mortar Vapor pressure Pore structure evolution Cracking mechanism |
| title | Pore structure evolution and cracking mechanism of mortar caused by pore vapor pressure during microwave heating |
| title_full | Pore structure evolution and cracking mechanism of mortar caused by pore vapor pressure during microwave heating |
| title_fullStr | Pore structure evolution and cracking mechanism of mortar caused by pore vapor pressure during microwave heating |
| title_full_unstemmed | Pore structure evolution and cracking mechanism of mortar caused by pore vapor pressure during microwave heating |
| title_short | Pore structure evolution and cracking mechanism of mortar caused by pore vapor pressure during microwave heating |
| title_sort | pore structure evolution and cracking mechanism of mortar caused by pore vapor pressure during microwave heating |
| topic | Microwave heating Mortar Vapor pressure Pore structure evolution Cracking mechanism |
| url | http://www.sciencedirect.com/science/article/pii/S2238785425013833 |
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