Experimental Study and Application of LASC Foamed Concrete to Create Airtight Walls in Coal Mines
If an airtight wall in a coal mine leaks air, it may cause spontaneous combustion of residual coal in the gob and even cause a full-blown fire or gas explosion. In this study, we developed a new type of foamed concrete, low-alkalinity sulphoaluminate cement (LASC), to control air leakage. The perfor...
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2020/6804906 |
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| author | Duo Zhang Weifeng Wang Jun Deng Hu Wen Xiaowei Zhai |
| author_facet | Duo Zhang Weifeng Wang Jun Deng Hu Wen Xiaowei Zhai |
| author_sort | Duo Zhang |
| collection | DOAJ |
| description | If an airtight wall in a coal mine leaks air, it may cause spontaneous combustion of residual coal in the gob and even cause a full-blown fire or gas explosion. In this study, we developed a new type of foamed concrete, low-alkalinity sulphoaluminate cement (LASC), to control air leakage. The performance of filling materials that were prepared by adding various dosages of foam to LASC was studied. The longer the curing period for the foam filling material of LASC, the better the crystallinity of the hydrated product. With an increasing foam dosage, the initial setting time gradually extends while the fluidity of the foam slurry decreases. The bubble rate of the filling material increases and the density decreases with increasing foam dosage. The compressive strength of the LASC filling material decreases with increasing foam dosage and increases with increasing curing time. In the LASC filling materials, the optimal volume ratio of foam dosage to gel slurry is 2. The crystallinity, initial gel time, and compressive strength of the LASC foaming materials are better than those of ordinary Portland cement (OPC) foaming materials. When the crossheading is filled with LASC foam cement, the deformation of the surrounding rock is less than 19 cm, and the air leakage prevention is better than that achieved with loess and fly-ash-cement foam. Thus, the proposed LASC foam material can be applied to the filling of the crossheading to efficiently prevent leakage in underground coal mines. |
| format | Article |
| id | doaj-art-a6261035f3ad4cfbab99fa46c912ec93 |
| institution | Kabale University |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-a6261035f3ad4cfbab99fa46c912ec932025-02-03T06:06:38ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422020-01-01202010.1155/2020/68049066804906Experimental Study and Application of LASC Foamed Concrete to Create Airtight Walls in Coal MinesDuo Zhang0Weifeng Wang1Jun Deng2Hu Wen3Xiaowei Zhai4School of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an, Shaanxi 710054, ChinaSchool of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an, Shaanxi 710054, ChinaSchool of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an, Shaanxi 710054, ChinaSchool of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an, Shaanxi 710054, ChinaSchool of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an, Shaanxi 710054, ChinaIf an airtight wall in a coal mine leaks air, it may cause spontaneous combustion of residual coal in the gob and even cause a full-blown fire or gas explosion. In this study, we developed a new type of foamed concrete, low-alkalinity sulphoaluminate cement (LASC), to control air leakage. The performance of filling materials that were prepared by adding various dosages of foam to LASC was studied. The longer the curing period for the foam filling material of LASC, the better the crystallinity of the hydrated product. With an increasing foam dosage, the initial setting time gradually extends while the fluidity of the foam slurry decreases. The bubble rate of the filling material increases and the density decreases with increasing foam dosage. The compressive strength of the LASC filling material decreases with increasing foam dosage and increases with increasing curing time. In the LASC filling materials, the optimal volume ratio of foam dosage to gel slurry is 2. The crystallinity, initial gel time, and compressive strength of the LASC foaming materials are better than those of ordinary Portland cement (OPC) foaming materials. When the crossheading is filled with LASC foam cement, the deformation of the surrounding rock is less than 19 cm, and the air leakage prevention is better than that achieved with loess and fly-ash-cement foam. Thus, the proposed LASC foam material can be applied to the filling of the crossheading to efficiently prevent leakage in underground coal mines.http://dx.doi.org/10.1155/2020/6804906 |
| spellingShingle | Duo Zhang Weifeng Wang Jun Deng Hu Wen Xiaowei Zhai Experimental Study and Application of LASC Foamed Concrete to Create Airtight Walls in Coal Mines Advances in Materials Science and Engineering |
| title | Experimental Study and Application of LASC Foamed Concrete to Create Airtight Walls in Coal Mines |
| title_full | Experimental Study and Application of LASC Foamed Concrete to Create Airtight Walls in Coal Mines |
| title_fullStr | Experimental Study and Application of LASC Foamed Concrete to Create Airtight Walls in Coal Mines |
| title_full_unstemmed | Experimental Study and Application of LASC Foamed Concrete to Create Airtight Walls in Coal Mines |
| title_short | Experimental Study and Application of LASC Foamed Concrete to Create Airtight Walls in Coal Mines |
| title_sort | experimental study and application of lasc foamed concrete to create airtight walls in coal mines |
| url | http://dx.doi.org/10.1155/2020/6804906 |
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