Properties and Engineering Applications of a New Goaf Grouting Filling Material
In the treatment of goafs in traffic engineering, technical problems such as those related to large-volume grouting and the precise control of material properties are often encountered. To address these issues, we developed a new composite material comprising cement-fly ash-modified sodium silicate...
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| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2022-01-01
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| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2022/6778076 |
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| _version_ | 1832550931630129152 |
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| author | Xiao Feng Chong Xia Sifeng Zhang Chuangui Li Hongkui Zhao Jianfeng Wu Mengjun Chen Jia Yan |
| author_facet | Xiao Feng Chong Xia Sifeng Zhang Chuangui Li Hongkui Zhao Jianfeng Wu Mengjun Chen Jia Yan |
| author_sort | Xiao Feng |
| collection | DOAJ |
| description | In the treatment of goafs in traffic engineering, technical problems such as those related to large-volume grouting and the precise control of material properties are often encountered. To address these issues, we developed a new composite material comprising cement-fly ash-modified sodium silicate (C-FA-MS). The setting time, fluidity, unconfined compressive strength, and microstructure were varied for different proportions of cement-sodium silicate (C-S) slurry, cement-fly ash-sodium silicate (C-FA-S) slurry, and C-FA-MS slurry, and their performances were compared and analysed. The experimental results showed that the initial setting time of the slurry was the shortest when both the original sodium silicate volume ratio (VS) and modified sodium silicate volume ratio (VMS) were 0.2. The final setting time of the C-S and C-FA-S slurries tended to decrease but then increased with decrease in VS, while that of the C-FA-MS slurry increased with lower VMS. The fluidity of the C-FA-S and C-FA-MS slurries decreased with decrease in VS or VMS at different fly ash admixture ratios. The consolidation compressive strength of C-S increased with decreasing VS, while that of C-FA-S showed a considerable increase only when VS decreased from 0.4 to 0.2. Meanwhile, the compressive strength of the C-FA-MS concretions first increased and then decreased with decrease in VMS. Microstructural analysis revealed that there were more cracks in the C-S agglomerate, the fly ash in the C-FA-S agglomerate reduced the relative density of the skeletal structure, and the stronger cross-linking in the C-FA-MS agglomerate improved the strength of the agglomerate. Under the condition of unit grouting volume, the cost of the C-FA-MS slurry was approximately 44.7% and 31.3% lower than that of the C-S and C-FA-S slurries, respectively. The new C-FA-MS material was applied for the treatment of the goaf in the Wu Sizhuang coal mine. Core drilling detection and audiofrequency magnetotelluric survey revealed that the goaf was sufficiently filled. |
| format | Article |
| id | doaj-art-c2fc52f10fcc4e06860499b2e1b19968 |
| institution | Kabale University |
| issn | 1468-8123 |
| language | English |
| publishDate | 2022-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-c2fc52f10fcc4e06860499b2e1b199682025-02-03T06:05:31ZengWileyGeofluids1468-81232022-01-01202210.1155/2022/6778076Properties and Engineering Applications of a New Goaf Grouting Filling MaterialXiao Feng0Chong Xia1Sifeng Zhang2Chuangui Li3Hongkui Zhao4Jianfeng Wu5Mengjun Chen6Jia Yan7School of Transportation EngineeringSchool of Transportation EngineeringSchool of Transportation EngineeringShandong Luqiao Group Co.Shandong Luqiao Group Co.Shandong Luqiao Group Co.School of Qilu TransportationResearch Center of Geotechnical and Structural EngineeringIn the treatment of goafs in traffic engineering, technical problems such as those related to large-volume grouting and the precise control of material properties are often encountered. To address these issues, we developed a new composite material comprising cement-fly ash-modified sodium silicate (C-FA-MS). The setting time, fluidity, unconfined compressive strength, and microstructure were varied for different proportions of cement-sodium silicate (C-S) slurry, cement-fly ash-sodium silicate (C-FA-S) slurry, and C-FA-MS slurry, and their performances were compared and analysed. The experimental results showed that the initial setting time of the slurry was the shortest when both the original sodium silicate volume ratio (VS) and modified sodium silicate volume ratio (VMS) were 0.2. The final setting time of the C-S and C-FA-S slurries tended to decrease but then increased with decrease in VS, while that of the C-FA-MS slurry increased with lower VMS. The fluidity of the C-FA-S and C-FA-MS slurries decreased with decrease in VS or VMS at different fly ash admixture ratios. The consolidation compressive strength of C-S increased with decreasing VS, while that of C-FA-S showed a considerable increase only when VS decreased from 0.4 to 0.2. Meanwhile, the compressive strength of the C-FA-MS concretions first increased and then decreased with decrease in VMS. Microstructural analysis revealed that there were more cracks in the C-S agglomerate, the fly ash in the C-FA-S agglomerate reduced the relative density of the skeletal structure, and the stronger cross-linking in the C-FA-MS agglomerate improved the strength of the agglomerate. Under the condition of unit grouting volume, the cost of the C-FA-MS slurry was approximately 44.7% and 31.3% lower than that of the C-S and C-FA-S slurries, respectively. The new C-FA-MS material was applied for the treatment of the goaf in the Wu Sizhuang coal mine. Core drilling detection and audiofrequency magnetotelluric survey revealed that the goaf was sufficiently filled.http://dx.doi.org/10.1155/2022/6778076 |
| spellingShingle | Xiao Feng Chong Xia Sifeng Zhang Chuangui Li Hongkui Zhao Jianfeng Wu Mengjun Chen Jia Yan Properties and Engineering Applications of a New Goaf Grouting Filling Material Geofluids |
| title | Properties and Engineering Applications of a New Goaf Grouting Filling Material |
| title_full | Properties and Engineering Applications of a New Goaf Grouting Filling Material |
| title_fullStr | Properties and Engineering Applications of a New Goaf Grouting Filling Material |
| title_full_unstemmed | Properties and Engineering Applications of a New Goaf Grouting Filling Material |
| title_short | Properties and Engineering Applications of a New Goaf Grouting Filling Material |
| title_sort | properties and engineering applications of a new goaf grouting filling material |
| url | http://dx.doi.org/10.1155/2022/6778076 |
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