Research on the performance and application of nano-MgO modified ultrafine cement-based sealing materials
The gas tightness and strength of cement-based sealing materials are critical factors influencing coalbed methane (CBM) extraction efficiency. However, ordinary cement-based sealing materials tend to lose water, shrink, and develop cracks, which results in poor gas extraction performance. Therefore,...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-07-01
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| Series: | Case Studies in Construction Materials |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214509525004929 |
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| author | Jiajia Zhao Shixiang Tian Cheng Chen Xuan Zhang Tengfei Ma Qican Ran Xinbo Luo |
| author_facet | Jiajia Zhao Shixiang Tian Cheng Chen Xuan Zhang Tengfei Ma Qican Ran Xinbo Luo |
| author_sort | Jiajia Zhao |
| collection | DOAJ |
| description | The gas tightness and strength of cement-based sealing materials are critical factors influencing coalbed methane (CBM) extraction efficiency. However, ordinary cement-based sealing materials tend to lose water, shrink, and develop cracks, which results in poor gas extraction performance. Therefore, modifying cement-based sealing materials with nano-expansion materials is one of the effective solutions to this problem. This study utilized a range of experimental techniques and a coal mining case study to systematically explore the impact of nano-MgO content on the performance of ultrafine cement-based sealing materials, and to clarify the mechanism through which nano-MgO improves the properties of the modified materials. The results show that as the nano-MgO content increases, the setting time, flowability, and water bleeding rate of the modified materials decrease, while the expansion rate increases. Uniaxial compressive tests indicate that the material with 0.7 wt% nano-MgO content achieves the best compressive strength improvement. Nano-MgO significantly improved the material’s density and surface morphology, enhanced the pore structure, and strengthened the material’s strength and stability. Additionally, nano-MgO promoted the formation of hydration products such as Mg(OH)₂, and the degree of reaction of nano-MgO increased with curing time, showing an active role in promoting hydration reactions. A coal mine case study found that the 0.7 wt% nano-MgO modified material increased the maximum gas extraction concentration from a single hole by about 24 %, and the gas extraction volume by about 47 %. This study provides reliable technical support and theoretical basis for the application of new drilling sealing materials. |
| format | Article |
| id | doaj-art-09bde330aabe4753950eb4bb40e0d133 |
| institution | OA Journals |
| issn | 2214-5095 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Construction Materials |
| spelling | doaj-art-09bde330aabe4753950eb4bb40e0d1332025-08-20T02:18:46ZengElsevierCase Studies in Construction Materials2214-50952025-07-0122e0469410.1016/j.cscm.2025.e04694Research on the performance and application of nano-MgO modified ultrafine cement-based sealing materialsJiajia Zhao0Shixiang Tian1Cheng Chen2Xuan Zhang3Tengfei Ma4Qican Ran5Xinbo Luo6College of Mining, Guizhou University, Guiyang 550025, PR ChinaCollege of Mining, Guizhou University, Guiyang 550025, PR China; National & Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Resources from Karst Areas, Guiyang 550025, PR China; Guizhou Key Lab of Comprehensive Utilization of Non-metallic Mineral Resources, Guiyang 550025, PR China; Corresponding author at: College of Mining, Guizhou University, Guiyang 550025, PR China.College of Mining, Guizhou University, Guiyang 550025, PR ChinaCollege of Mining, Guizhou University, Guiyang 550025, PR ChinaState Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, PR ChinaState Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, PR ChinaPanxian Yuni Township Changxing Coal Mine, Guizhou Bangda Energy Development Co., Ltd., Panzhou 553503, PR ChinaThe gas tightness and strength of cement-based sealing materials are critical factors influencing coalbed methane (CBM) extraction efficiency. However, ordinary cement-based sealing materials tend to lose water, shrink, and develop cracks, which results in poor gas extraction performance. Therefore, modifying cement-based sealing materials with nano-expansion materials is one of the effective solutions to this problem. This study utilized a range of experimental techniques and a coal mining case study to systematically explore the impact of nano-MgO content on the performance of ultrafine cement-based sealing materials, and to clarify the mechanism through which nano-MgO improves the properties of the modified materials. The results show that as the nano-MgO content increases, the setting time, flowability, and water bleeding rate of the modified materials decrease, while the expansion rate increases. Uniaxial compressive tests indicate that the material with 0.7 wt% nano-MgO content achieves the best compressive strength improvement. Nano-MgO significantly improved the material’s density and surface morphology, enhanced the pore structure, and strengthened the material’s strength and stability. Additionally, nano-MgO promoted the formation of hydration products such as Mg(OH)₂, and the degree of reaction of nano-MgO increased with curing time, showing an active role in promoting hydration reactions. A coal mine case study found that the 0.7 wt% nano-MgO modified material increased the maximum gas extraction concentration from a single hole by about 24 %, and the gas extraction volume by about 47 %. This study provides reliable technical support and theoretical basis for the application of new drilling sealing materials.http://www.sciencedirect.com/science/article/pii/S2214509525004929Cement compositeNano-MgOUltrafine cementNano modificationSealing materialsGas extraction |
| spellingShingle | Jiajia Zhao Shixiang Tian Cheng Chen Xuan Zhang Tengfei Ma Qican Ran Xinbo Luo Research on the performance and application of nano-MgO modified ultrafine cement-based sealing materials Case Studies in Construction Materials Cement composite Nano-MgO Ultrafine cement Nano modification Sealing materials Gas extraction |
| title | Research on the performance and application of nano-MgO modified ultrafine cement-based sealing materials |
| title_full | Research on the performance and application of nano-MgO modified ultrafine cement-based sealing materials |
| title_fullStr | Research on the performance and application of nano-MgO modified ultrafine cement-based sealing materials |
| title_full_unstemmed | Research on the performance and application of nano-MgO modified ultrafine cement-based sealing materials |
| title_short | Research on the performance and application of nano-MgO modified ultrafine cement-based sealing materials |
| title_sort | research on the performance and application of nano mgo modified ultrafine cement based sealing materials |
| topic | Cement composite Nano-MgO Ultrafine cement Nano modification Sealing materials Gas extraction |
| url | http://www.sciencedirect.com/science/article/pii/S2214509525004929 |
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