Development and application of novel high‐efficiency composite ultrafine cement grouts for roadway in fractured surrounding rocks
Abstract The fractured surrounding rocks of roadways pose major challenges to safe mining. Grouting has often been used to reinforce the surrounding rocks to mitigate the safety risks associated with fractured rocks. The aim of this study is to develop highly efficient composite ultrafine cement (CU...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2024-03-01
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| Series: | Deep Underground Science and Engineering |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/dug2.12058 |
| _version_ | 1797242592527646720 |
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| author | Maolin Tian Shaojie Chen Lijun Han Hongtian Xiao |
| author_facet | Maolin Tian Shaojie Chen Lijun Han Hongtian Xiao |
| author_sort | Maolin Tian |
| collection | DOAJ |
| description | Abstract The fractured surrounding rocks of roadways pose major challenges to safe mining. Grouting has often been used to reinforce the surrounding rocks to mitigate the safety risks associated with fractured rocks. The aim of this study is to develop highly efficient composite ultrafine cement (CUC) grouts to reinforce the roadway in fractured surrounding rocks. The materials used are ultrafine cement (UC), ultrafine fly ash (UF), ultrafine slag (US), and additives (superplasticizer [SUP], aluminate ultrafine expansion agent [AUA], gypsum, and retarder). The fluidity, bleeding, shrinkage, setting time, chemical composition, microstructure, degree of hydration, and mechanical property of grouting materials were evaluated in this study. Also, a suitable and effective CUC grout mixture was used to reinforce the roadway in the fractured surrounding rock. The results have shown that the addition of UF and US reduces the plastic viscosity of CUC, and the best fluidity can be obtained by adding 40% UF and 10% US. Since UC and UF particles are small, the pozzolanic effect of UF promotes the hydration reaction, which is conductive to the stability of CUC grouts. In addition, fine particles of UC, UF, and US can effectively fill the pores, while the volumetric expansion of AUA and gypsum decreases the pores and thus affects the microstructure of the solidified grout. The compressive test results have shown that the addition of specific amounts of UF and US can ameliorate the mechanical properties of CUC grouts. Finally, the CUC22‐8 grout was used to reinforce the No. 20322 belt roadway. The results of numerical simulation and field monitoring have indicated that grouting can efficaciously reinforce the surrounding rock of the roadway. In this research, high‐performance CUC grouts were developed for surrounding rock reinforcement of underground engineering by utilizing UC and some additives. |
| first_indexed | 2024-04-24T18:41:40Z |
| format | Article |
| id | doaj.art-0c394ab4faa44b21bd1ae7dee1f854e9 |
| institution | Directory Open Access Journal |
| issn | 2097-0668 2770-1328 |
| language | English |
| last_indexed | 2024-04-24T18:41:40Z |
| publishDate | 2024-03-01 |
| publisher | Wiley |
| record_format | Article |
| series | Deep Underground Science and Engineering |
| spelling | doaj.art-0c394ab4faa44b21bd1ae7dee1f854e92024-03-27T10:29:49ZengWileyDeep Underground Science and Engineering2097-06682770-13282024-03-0131536910.1002/dug2.12058Development and application of novel high‐efficiency composite ultrafine cement grouts for roadway in fractured surrounding rocksMaolin Tian0Shaojie Chen1Lijun Han2Hongtian Xiao3Shandong Key Laboratory of Civil Engineering Disaster Prevention and Mitigation Shandong University of Science and Technology Qingdao ChinaCollege of Energy and Mining Engineering Shandong University of Science and Technology Qingdao ChinaState Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and Technology Xuzhou ChinaShandong Key Laboratory of Civil Engineering Disaster Prevention and Mitigation Shandong University of Science and Technology Qingdao ChinaAbstract The fractured surrounding rocks of roadways pose major challenges to safe mining. Grouting has often been used to reinforce the surrounding rocks to mitigate the safety risks associated with fractured rocks. The aim of this study is to develop highly efficient composite ultrafine cement (CUC) grouts to reinforce the roadway in fractured surrounding rocks. The materials used are ultrafine cement (UC), ultrafine fly ash (UF), ultrafine slag (US), and additives (superplasticizer [SUP], aluminate ultrafine expansion agent [AUA], gypsum, and retarder). The fluidity, bleeding, shrinkage, setting time, chemical composition, microstructure, degree of hydration, and mechanical property of grouting materials were evaluated in this study. Also, a suitable and effective CUC grout mixture was used to reinforce the roadway in the fractured surrounding rock. The results have shown that the addition of UF and US reduces the plastic viscosity of CUC, and the best fluidity can be obtained by adding 40% UF and 10% US. Since UC and UF particles are small, the pozzolanic effect of UF promotes the hydration reaction, which is conductive to the stability of CUC grouts. In addition, fine particles of UC, UF, and US can effectively fill the pores, while the volumetric expansion of AUA and gypsum decreases the pores and thus affects the microstructure of the solidified grout. The compressive test results have shown that the addition of specific amounts of UF and US can ameliorate the mechanical properties of CUC grouts. Finally, the CUC22‐8 grout was used to reinforce the No. 20322 belt roadway. The results of numerical simulation and field monitoring have indicated that grouting can efficaciously reinforce the surrounding rock of the roadway. In this research, high‐performance CUC grouts were developed for surrounding rock reinforcement of underground engineering by utilizing UC and some additives.https://doi.org/10.1002/dug2.12058broken surrounding rockcomposite ultrafine cement (CUC) groutsgrouting materialgrouting performancegrouting reinforcement |
| spellingShingle | Maolin Tian Shaojie Chen Lijun Han Hongtian Xiao Development and application of novel high‐efficiency composite ultrafine cement grouts for roadway in fractured surrounding rocks Deep Underground Science and Engineering broken surrounding rock composite ultrafine cement (CUC) grouts grouting material grouting performance grouting reinforcement |
| title | Development and application of novel high‐efficiency composite ultrafine cement grouts for roadway in fractured surrounding rocks |
| title_full | Development and application of novel high‐efficiency composite ultrafine cement grouts for roadway in fractured surrounding rocks |
| title_fullStr | Development and application of novel high‐efficiency composite ultrafine cement grouts for roadway in fractured surrounding rocks |
| title_full_unstemmed | Development and application of novel high‐efficiency composite ultrafine cement grouts for roadway in fractured surrounding rocks |
| title_short | Development and application of novel high‐efficiency composite ultrafine cement grouts for roadway in fractured surrounding rocks |
| title_sort | development and application of novel high efficiency composite ultrafine cement grouts for roadway in fractured surrounding rocks |
| topic | broken surrounding rock composite ultrafine cement (CUC) grouts grouting material grouting performance grouting reinforcement |
| url | https://doi.org/10.1002/dug2.12058 |
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