Effect of Rice Straw on Tensile Properties of Tailings Cemented Paste Backfill
It is important and difficult to improve the tensile strength of backfill material to ensure the stability of goafs. In this study, rice straw (RS) in fiber form is used to improve the tensile properties of cemented paste backfill (CPB). An orthogonal experiment was designed, Brazilian indirect tens...
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MDPI AG
2022-01-01
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| Online Access: | https://www.mdpi.com/2076-3417/12/1/526 |
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| author | Zeyu Li Xiuzhi Shi Xin Chen |
| author_facet | Zeyu Li Xiuzhi Shi Xin Chen |
| author_sort | Zeyu Li |
| collection | DOAJ |
| description | It is important and difficult to improve the tensile strength of backfill material to ensure the stability of goafs. In this study, rice straw (RS) in fiber form is used to improve the tensile properties of cemented paste backfill (CPB). An orthogonal experiment was designed, Brazilian indirect tensile strength tests were conducted to test the tensile performance of RS fiber-reinforced cemented paste backfill (RSCPB) under different fiber content (1, 2, 3 kg/m<sup>3</sup>) and fiber length (0.8~1, 1~3, 3~5 cm), and the microstructure of RSCPB was analyzed with scanning electron microscopy (SEM). The results showed that, compared with the conventional cemented paste backfill (CCPB), the increase in tensile strength of RSCPB ranged from 115.38% to 300.00% at 3 days curing age, 40.91% to 346.15% at 7 days, and −38.10% to 28.00% at 28 days, and the strain was slightly reduced during the curing period. The tensile strength, strain, and percentage increase of the RSCPB compared to the CCBP did not show a monotonic pattern of variation with the RS fiber content and length during the curing period. The RSCPB samples fractured under peak stress, showing obvious brittle failure. In addition, sulfate generated from S<sup>2−</sup> in the tailings inhibits the hydration reaction, and generates swelling products that form weak structural surfaces, which, in turn, lead to a 28-day tensile strength and strain of RSCPB lower than those at 7 days. |
| first_indexed | 2024-03-10T03:48:28Z |
| format | Article |
| id | doaj.art-9634226bfdf54710b1b0aef5c8170232 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T03:48:28Z |
| publishDate | 2022-01-01 |
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| spelling | doaj.art-9634226bfdf54710b1b0aef5c81702322023-11-23T11:14:28ZengMDPI AGApplied Sciences2076-34172022-01-0112152610.3390/app12010526Effect of Rice Straw on Tensile Properties of Tailings Cemented Paste BackfillZeyu Li0Xiuzhi Shi1Xin Chen2School of Resources and Safety Engineering, Central South University, Changsha 410083, ChinaSchool of Resources and Safety Engineering, Central South University, Changsha 410083, ChinaSchool of Resources and Safety Engineering, Central South University, Changsha 410083, ChinaIt is important and difficult to improve the tensile strength of backfill material to ensure the stability of goafs. In this study, rice straw (RS) in fiber form is used to improve the tensile properties of cemented paste backfill (CPB). An orthogonal experiment was designed, Brazilian indirect tensile strength tests were conducted to test the tensile performance of RS fiber-reinforced cemented paste backfill (RSCPB) under different fiber content (1, 2, 3 kg/m<sup>3</sup>) and fiber length (0.8~1, 1~3, 3~5 cm), and the microstructure of RSCPB was analyzed with scanning electron microscopy (SEM). The results showed that, compared with the conventional cemented paste backfill (CCPB), the increase in tensile strength of RSCPB ranged from 115.38% to 300.00% at 3 days curing age, 40.91% to 346.15% at 7 days, and −38.10% to 28.00% at 28 days, and the strain was slightly reduced during the curing period. The tensile strength, strain, and percentage increase of the RSCPB compared to the CCBP did not show a monotonic pattern of variation with the RS fiber content and length during the curing period. The RSCPB samples fractured under peak stress, showing obvious brittle failure. In addition, sulfate generated from S<sup>2−</sup> in the tailings inhibits the hydration reaction, and generates swelling products that form weak structural surfaces, which, in turn, lead to a 28-day tensile strength and strain of RSCPB lower than those at 7 days.https://www.mdpi.com/2076-3417/12/1/526rice straw fibercemented paste backfillBrazilian testorthogonal experimenttensile strengthtensile strain |
| spellingShingle | Zeyu Li Xiuzhi Shi Xin Chen Effect of Rice Straw on Tensile Properties of Tailings Cemented Paste Backfill Applied Sciences rice straw fiber cemented paste backfill Brazilian test orthogonal experiment tensile strength tensile strain |
| title | Effect of Rice Straw on Tensile Properties of Tailings Cemented Paste Backfill |
| title_full | Effect of Rice Straw on Tensile Properties of Tailings Cemented Paste Backfill |
| title_fullStr | Effect of Rice Straw on Tensile Properties of Tailings Cemented Paste Backfill |
| title_full_unstemmed | Effect of Rice Straw on Tensile Properties of Tailings Cemented Paste Backfill |
| title_short | Effect of Rice Straw on Tensile Properties of Tailings Cemented Paste Backfill |
| title_sort | effect of rice straw on tensile properties of tailings cemented paste backfill |
| topic | rice straw fiber cemented paste backfill Brazilian test orthogonal experiment tensile strength tensile strain |
| url | https://www.mdpi.com/2076-3417/12/1/526 |
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