Macroscopic and microscopic characteristics of nanosilica sol-based composite grout in sealing fractured argillaceous rock: A comparative study with silica sol and cement slurry
Argillaceous surrounding rock is prone to weakening when exposed to water, which can cause significant long-term deformations and instability in roadways. This paper focuses on a high-injectability, high-strength nanosilica sol-based composite grout, characterizing its sealing patterns at both the m...
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Elsevier
2025-01-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785424029314 |
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| author | Zhe Xiang Nong Zhang Dongjiang Pan Zhengzheng Xie Peng Wang Dongxu Liang |
| author_facet | Zhe Xiang Nong Zhang Dongjiang Pan Zhengzheng Xie Peng Wang Dongxu Liang |
| author_sort | Zhe Xiang |
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| description | Argillaceous surrounding rock is prone to weakening when exposed to water, which can cause significant long-term deformations and instability in roadways. This paper focuses on a high-injectability, high-strength nanosilica sol-based composite grout, characterizing its sealing patterns at both the macroscopic and microscopic levels within multilevel porous argillaceous rock bodies. It also explores the microscopic structural interactions at the grout-rock interface. Additionally, the paper compares the performance of this composite grout with traditional silica sol and cement grout, providing initial insights into the anti-seepage reinforcement mechanism of the composite grout when used in grouting argillaceous soft rock. The research results show that, for composite grouting (1) The porosity and sealing of the grout-rock cementitious body decrease with increasing particle size of the rock blocks, with a minimum permeability coefficient of 2.34 × 10−8 cm/s; (2) The presence and distribution pattern of multi-level pores of grout in rock fractures can be evaluated using the T2 spectrum of nuclear magnetic resonance (NMR). The pore volume of the cementitious body is mainly provided by large pores <100 ms, and the composite grout has a good sealing effect on the matrix system of the argillaceous rock. (3) There is a dense transition area at the grout-rock interface, formed by the accumulation of nano-materials such as aluminate cement hydration-formed aluminate gel and silica sol. On the grout-rock interface, aluminate gel nucleates on nano-SiO2, continuously precipitating, aggregating, and cross-linking on the surface of silica particles to form a dense gel, filling the cavities at the grout-rock interface and increasing structural density. The research findings aim to provide theoretical support and experimental research basis for the practical application of composite grout in anti-seepage reinforcement engineering of argillaceous soft rock at the site. |
| format | Article |
| id | doaj-art-aadf5ceab1194dcc969c41128628e590 |
| institution | Kabale University |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj-art-aadf5ceab1194dcc969c41128628e5902025-01-19T06:25:34ZengElsevierJournal of Materials Research and Technology2238-78542025-01-0134898911Macroscopic and microscopic characteristics of nanosilica sol-based composite grout in sealing fractured argillaceous rock: A comparative study with silica sol and cement slurryZhe Xiang0Nong Zhang1Dongjiang Pan2Zhengzheng Xie3Peng Wang4Dongxu Liang5School of Mines, Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, China University of Mining and Technology, Xuzhou, 221116, Jiangsu, ChinaSchool of Mines, Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, China University of Mining and Technology, Xuzhou, 221116, Jiangsu, China; School of Civil Engineering, Xuzhou University of Technology, Xuzhou, 221116, Jiangsu, China; Corresponding author. School of Mines, Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China.School of Civil Engineering, Xuzhou University of Technology, Xuzhou, 221116, Jiangsu, ChinaSchool of Mines, Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, China University of Mining and Technology, Xuzhou, 221116, Jiangsu, ChinaSchool of Mines, Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, China University of Mining and Technology, Xuzhou, 221116, Jiangsu, ChinaSchool of Civil Engineering, Xuzhou University of Technology, Xuzhou, 221116, Jiangsu, ChinaArgillaceous surrounding rock is prone to weakening when exposed to water, which can cause significant long-term deformations and instability in roadways. This paper focuses on a high-injectability, high-strength nanosilica sol-based composite grout, characterizing its sealing patterns at both the macroscopic and microscopic levels within multilevel porous argillaceous rock bodies. It also explores the microscopic structural interactions at the grout-rock interface. Additionally, the paper compares the performance of this composite grout with traditional silica sol and cement grout, providing initial insights into the anti-seepage reinforcement mechanism of the composite grout when used in grouting argillaceous soft rock. The research results show that, for composite grouting (1) The porosity and sealing of the grout-rock cementitious body decrease with increasing particle size of the rock blocks, with a minimum permeability coefficient of 2.34 × 10−8 cm/s; (2) The presence and distribution pattern of multi-level pores of grout in rock fractures can be evaluated using the T2 spectrum of nuclear magnetic resonance (NMR). The pore volume of the cementitious body is mainly provided by large pores <100 ms, and the composite grout has a good sealing effect on the matrix system of the argillaceous rock. (3) There is a dense transition area at the grout-rock interface, formed by the accumulation of nano-materials such as aluminate cement hydration-formed aluminate gel and silica sol. On the grout-rock interface, aluminate gel nucleates on nano-SiO2, continuously precipitating, aggregating, and cross-linking on the surface of silica particles to form a dense gel, filling the cavities at the grout-rock interface and increasing structural density. The research findings aim to provide theoretical support and experimental research basis for the practical application of composite grout in anti-seepage reinforcement engineering of argillaceous soft rock at the site.http://www.sciencedirect.com/science/article/pii/S2238785424029314Argillaceous soft rockMicro-fracturesSilica solNuclear magnetic resonanceGrout-rock interface |
| spellingShingle | Zhe Xiang Nong Zhang Dongjiang Pan Zhengzheng Xie Peng Wang Dongxu Liang Macroscopic and microscopic characteristics of nanosilica sol-based composite grout in sealing fractured argillaceous rock: A comparative study with silica sol and cement slurry Journal of Materials Research and Technology Argillaceous soft rock Micro-fractures Silica sol Nuclear magnetic resonance Grout-rock interface |
| title | Macroscopic and microscopic characteristics of nanosilica sol-based composite grout in sealing fractured argillaceous rock: A comparative study with silica sol and cement slurry |
| title_full | Macroscopic and microscopic characteristics of nanosilica sol-based composite grout in sealing fractured argillaceous rock: A comparative study with silica sol and cement slurry |
| title_fullStr | Macroscopic and microscopic characteristics of nanosilica sol-based composite grout in sealing fractured argillaceous rock: A comparative study with silica sol and cement slurry |
| title_full_unstemmed | Macroscopic and microscopic characteristics of nanosilica sol-based composite grout in sealing fractured argillaceous rock: A comparative study with silica sol and cement slurry |
| title_short | Macroscopic and microscopic characteristics of nanosilica sol-based composite grout in sealing fractured argillaceous rock: A comparative study with silica sol and cement slurry |
| title_sort | macroscopic and microscopic characteristics of nanosilica sol based composite grout in sealing fractured argillaceous rock a comparative study with silica sol and cement slurry |
| topic | Argillaceous soft rock Micro-fractures Silica sol Nuclear magnetic resonance Grout-rock interface |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424029314 |
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