Experimental study on the strength deterioration of sulfidic paste backfill
Paste made from high-sulfur tailings shows strength deterioration to different degrees and this can cause great changes in the quality of the filling body. The deterioration and degradation mechanism of high-sulfur paste with different sulfur contents was analyzed using XRD (X-ray diffraction) phase...
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| Format: | Article |
| Language: | zho |
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Science Press
2017-10-01
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| Series: | 工程科学学报 |
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| Online Access: | http://cje.ustb.edu.cn/article/doi/10.13374/j.issn2095-9389.2017.10.005 |
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| author | CHENG Hai-yong WU Ai-xiang WANG Hong-jiang WANG Yi-ming |
| author_facet | CHENG Hai-yong WU Ai-xiang WANG Hong-jiang WANG Yi-ming |
| author_sort | CHENG Hai-yong |
| collection | DOAJ |
| description | Paste made from high-sulfur tailings shows strength deterioration to different degrees and this can cause great changes in the quality of the filling body. The deterioration and degradation mechanism of high-sulfur paste with different sulfur contents was analyzed using XRD (X-ray diffraction) phase analysis and an ESEM. The results showed that sulfur tailings promoted the growth of early strength to a certain extent, but inhibited the development of later strength, and the greater the sulfur content, the more obvious the effect. In addition, sulfate produced by sulfide oxidation can promote the formation of expansive ettringite and gypsum. Meanwhile, the acidic environment caused decalcification of C-S-H and dissolution of CH, destroys the cementitious system and further promotes the degradation of the filling body. The crystal expansion strain and crack development process were analyzed using a pore calculation model. The linear development of elastic strain in swelling material was clarified. |
| format | Article |
| id | doaj-art-374fe0afa3fe451aba83b12d72a0d8be |
| institution | OA Journals |
| issn | 2095-9389 |
| language | zho |
| publishDate | 2017-10-01 |
| publisher | Science Press |
| record_format | Article |
| series | 工程科学学报 |
| spelling | doaj-art-374fe0afa3fe451aba83b12d72a0d8be2025-08-20T01:47:52ZzhoScience Press工程科学学报2095-93892017-10-0139101493149710.13374/j.issn2095-9389.2017.10.005Experimental study on the strength deterioration of sulfidic paste backfillCHENG Hai-yong0WU Ai-xiang1WANG Hong-jiang2WANG Yi-ming3School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaSchool of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaSchool of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaSchool of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaPaste made from high-sulfur tailings shows strength deterioration to different degrees and this can cause great changes in the quality of the filling body. The deterioration and degradation mechanism of high-sulfur paste with different sulfur contents was analyzed using XRD (X-ray diffraction) phase analysis and an ESEM. The results showed that sulfur tailings promoted the growth of early strength to a certain extent, but inhibited the development of later strength, and the greater the sulfur content, the more obvious the effect. In addition, sulfate produced by sulfide oxidation can promote the formation of expansive ettringite and gypsum. Meanwhile, the acidic environment caused decalcification of C-S-H and dissolution of CH, destroys the cementitious system and further promotes the degradation of the filling body. The crystal expansion strain and crack development process were analyzed using a pore calculation model. The linear development of elastic strain in swelling material was clarified.http://cje.ustb.edu.cn/article/doi/10.13374/j.issn2095-9389.2017.10.005paste backfillsulfide tailingsstrength degradationmicrostructurepyrite |
| spellingShingle | CHENG Hai-yong WU Ai-xiang WANG Hong-jiang WANG Yi-ming Experimental study on the strength deterioration of sulfidic paste backfill 工程科学学报 paste backfill sulfide tailings strength degradation microstructure pyrite |
| title | Experimental study on the strength deterioration of sulfidic paste backfill |
| title_full | Experimental study on the strength deterioration of sulfidic paste backfill |
| title_fullStr | Experimental study on the strength deterioration of sulfidic paste backfill |
| title_full_unstemmed | Experimental study on the strength deterioration of sulfidic paste backfill |
| title_short | Experimental study on the strength deterioration of sulfidic paste backfill |
| title_sort | experimental study on the strength deterioration of sulfidic paste backfill |
| topic | paste backfill sulfide tailings strength degradation microstructure pyrite |
| url | http://cje.ustb.edu.cn/article/doi/10.13374/j.issn2095-9389.2017.10.005 |
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