Insight into the active roof-contact of cemented paste backfill: A high-efficient expansion material
If the cemented paste backfill (CPB) does not contact the roof, it will cause mining safety problems such as roof collapse, and the passive roof contact technology cannot effectively solve the problem. Therefore, the active roof-contact technology based on expansion agent was developed. The orthogon...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2024-07-01
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| Series: | Case Studies in Construction Materials |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214509524002742 |
| _version_ | 1797226639850995712 |
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| author | Shaoyong Wang Zhenqi Wang Chong Chen Aixiang Wu |
| author_facet | Shaoyong Wang Zhenqi Wang Chong Chen Aixiang Wu |
| author_sort | Shaoyong Wang |
| collection | DOAJ |
| description | If the cemented paste backfill (CPB) does not contact the roof, it will cause mining safety problems such as roof collapse, and the passive roof contact technology cannot effectively solve the problem. Therefore, the active roof-contact technology based on expansion agent was developed. The orthogonal experiments were carried out to study the influence of mass concentration, tailings-to-cement ratio and expansion agent content on the expansion ratio and mechanical properties of CPB. Through the range analysis of the expansion ratio and unconfined compressive strength (UCS), the significance of influencing factors on the expansion ratio and UCS was obtained. The experimental results show that the tailings-to-cement ratio has the greatest influence on the UCS, and the expansion agent content influence the expansion ratio more. The multivariate nonlinear regression models can accurately predict the expansion ratio and UCS of CPB. It is found that the sensitivity of expansion agent content to the expansion ratio decreases with the increase of tailings-to-cement ratio. According to the requirement of the mine for the expansion ratio and UCS, the expansion ratio and UCS were optimized by multi-objective optimization, and the optimal proportioning schemes suitable for the CPB in mines were obtained. Finally, the expansion mechanism was revealed by scanning electron microscope (SEM), and the evolution of the expansion agent with hydration process was analyzed. This study is of great significance to realize the roof-connect of metal mines, and has important practical value for the safe mining. |
| first_indexed | 2024-04-24T14:28:07Z |
| format | Article |
| id | doaj.art-964f813eead24b29b7c5dacdf91562d3 |
| institution | Directory Open Access Journal |
| issn | 2214-5095 |
| language | English |
| last_indexed | 2024-04-24T14:28:07Z |
| publishDate | 2024-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Construction Materials |
| spelling | doaj.art-964f813eead24b29b7c5dacdf91562d32024-04-03T04:26:38ZengElsevierCase Studies in Construction Materials2214-50952024-07-0120e03123Insight into the active roof-contact of cemented paste backfill: A high-efficient expansion materialShaoyong Wang0Zhenqi Wang1Chong Chen2Aixiang Wu3Key Laboratory of the Ministry of Education of China for High-efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing 100083, China; School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China; JCHX Mining Management Co. Ltd., Beijing 100070, ChinaKey Laboratory of the Ministry of Education of China for High-efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing 100083, China; School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China; Corresponding author at: Key Laboratory of the Ministry of Education of China for High-efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing 100083, ChinaKey Laboratory of the Ministry of Education of China for High-efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing 100083, China; School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaKey Laboratory of the Ministry of Education of China for High-efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing 100083, China; School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaIf the cemented paste backfill (CPB) does not contact the roof, it will cause mining safety problems such as roof collapse, and the passive roof contact technology cannot effectively solve the problem. Therefore, the active roof-contact technology based on expansion agent was developed. The orthogonal experiments were carried out to study the influence of mass concentration, tailings-to-cement ratio and expansion agent content on the expansion ratio and mechanical properties of CPB. Through the range analysis of the expansion ratio and unconfined compressive strength (UCS), the significance of influencing factors on the expansion ratio and UCS was obtained. The experimental results show that the tailings-to-cement ratio has the greatest influence on the UCS, and the expansion agent content influence the expansion ratio more. The multivariate nonlinear regression models can accurately predict the expansion ratio and UCS of CPB. It is found that the sensitivity of expansion agent content to the expansion ratio decreases with the increase of tailings-to-cement ratio. According to the requirement of the mine for the expansion ratio and UCS, the expansion ratio and UCS were optimized by multi-objective optimization, and the optimal proportioning schemes suitable for the CPB in mines were obtained. Finally, the expansion mechanism was revealed by scanning electron microscope (SEM), and the evolution of the expansion agent with hydration process was analyzed. This study is of great significance to realize the roof-connect of metal mines, and has important practical value for the safe mining.http://www.sciencedirect.com/science/article/pii/S2214509524002742Cemented paste backfillRoof-contactExpansion ratioMulti-objective optimizationExpansion mechanism |
| spellingShingle | Shaoyong Wang Zhenqi Wang Chong Chen Aixiang Wu Insight into the active roof-contact of cemented paste backfill: A high-efficient expansion material Case Studies in Construction Materials Cemented paste backfill Roof-contact Expansion ratio Multi-objective optimization Expansion mechanism |
| title | Insight into the active roof-contact of cemented paste backfill: A high-efficient expansion material |
| title_full | Insight into the active roof-contact of cemented paste backfill: A high-efficient expansion material |
| title_fullStr | Insight into the active roof-contact of cemented paste backfill: A high-efficient expansion material |
| title_full_unstemmed | Insight into the active roof-contact of cemented paste backfill: A high-efficient expansion material |
| title_short | Insight into the active roof-contact of cemented paste backfill: A high-efficient expansion material |
| title_sort | insight into the active roof contact of cemented paste backfill a high efficient expansion material |
| topic | Cemented paste backfill Roof-contact Expansion ratio Multi-objective optimization Expansion mechanism |
| url | http://www.sciencedirect.com/science/article/pii/S2214509524002742 |
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