Impacts of metakaolin and fly ash on the performance of cement-based grouting materials in anchoring engineering
ObjectiveThe filling of grouting materials plays a significant role in ensuring the performance of anchoring structures. This study aims to further enhance the fluidity of grouting materials, reduce their dry shrinkage in the curing process, and ensure complete filling. This will help improve the bo...
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Editorial Office of Coal Geology & Exploration
2025-06-01
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| Series: | Meitian dizhi yu kantan |
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| Online Access: | http://www.mtdzykt.com/article/doi/10.12363/issn.1001-1986.25.03.0214 |
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| author | Zhiyuan CHENG Junpeng YANG Wei XUE Daidong WEI Yimin WANG |
| author_facet | Zhiyuan CHENG Junpeng YANG Wei XUE Daidong WEI Yimin WANG |
| author_sort | Zhiyuan CHENG |
| collection | DOAJ |
| description | ObjectiveThe filling of grouting materials plays a significant role in ensuring the performance of anchoring structures. This study aims to further enhance the fluidity of grouting materials, reduce their dry shrinkage in the curing process, and ensure complete filling. This will help improve the bonding property between the anchoring body and the rock and soil mass to be reinforced. MethodsUsing cement as the primary material, as well as fly ash and metakaolin as admixtures, this study designed and prepared 20 groups of binary and ternary mixtures and one control group. Through tests of the fluidity, bleeding ratios, and mechanical strengths of these mixtures with different mix ratios, this study determined the impacts of metakaolin and fly ash on the performance of cement-based grouting materials. In combination with the X-ray diffraction (XRD) analysis and scanning electron microscopy , this study revealed the mechanisms underlying the regulation of metakaolin and fly ash for the performance of cement-based grouting materials. Finally, this study proposed the optimum mix ratio of grouting materials while considering the fluidity and filling ability of grouts, as well as the load-bearing capacity of the anchoring body.Results and Conclusions With the metakaolin and fly ash contents were controlled at approximately 6% and 15% to 20%, respectively, the resulting grout exhibited a reduced viscosity of 0.16 Pa·s and a reduced bleeding rate of 2% at γ = 100 s−1 compared to pure cement grout. Furthermore, its compressive strength increased to approximately 30 MPa at day 7 and about 32.7 MPa at day 28. In this case, the cement-based grouting material delivered the optimal overall performance. The XRD and SEM analyses indicate that metakaolin and fly ash exhibited significant synergistic effects when mixed into the ternary mixtures, as evidenced by a faster hydration rate, a more even distribution of hydration products, and a denser microstructure. The results of this study provide a scientific basis for enhancing the performance of cement-based grouting materials by using metakaolin and fly ash as admixtures, offering a valuable reference for the design and applications of grouting materials in anchoring engineering. |
| format | Article |
| id | doaj-art-093a41ac239140f3bc119af1018ee27a |
| institution | OA Journals |
| issn | 1001-1986 |
| language | zho |
| publishDate | 2025-06-01 |
| publisher | Editorial Office of Coal Geology & Exploration |
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| series | Meitian dizhi yu kantan |
| spelling | doaj-art-093a41ac239140f3bc119af1018ee27a2025-08-20T02:22:03ZzhoEditorial Office of Coal Geology & ExplorationMeitian dizhi yu kantan1001-19862025-06-0153622323210.12363/issn.1001-1986.25.03.021425-03-0214chenzhiyuanImpacts of metakaolin and fly ash on the performance of cement-based grouting materials in anchoring engineeringZhiyuan CHENG0Junpeng YANG1Wei XUE2Daidong WEI3Yimin WANG4School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, ChinaSchool of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, ChinaGuangzhou Chemical Grouting Co. Ltd., CAS, Guangzhou 510650, ChinaGuangzhou Chemical Grouting Co. Ltd., CAS, Guangzhou 510650, ChinaSchool of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, ChinaObjectiveThe filling of grouting materials plays a significant role in ensuring the performance of anchoring structures. This study aims to further enhance the fluidity of grouting materials, reduce their dry shrinkage in the curing process, and ensure complete filling. This will help improve the bonding property between the anchoring body and the rock and soil mass to be reinforced. MethodsUsing cement as the primary material, as well as fly ash and metakaolin as admixtures, this study designed and prepared 20 groups of binary and ternary mixtures and one control group. Through tests of the fluidity, bleeding ratios, and mechanical strengths of these mixtures with different mix ratios, this study determined the impacts of metakaolin and fly ash on the performance of cement-based grouting materials. In combination with the X-ray diffraction (XRD) analysis and scanning electron microscopy , this study revealed the mechanisms underlying the regulation of metakaolin and fly ash for the performance of cement-based grouting materials. Finally, this study proposed the optimum mix ratio of grouting materials while considering the fluidity and filling ability of grouts, as well as the load-bearing capacity of the anchoring body.Results and Conclusions With the metakaolin and fly ash contents were controlled at approximately 6% and 15% to 20%, respectively, the resulting grout exhibited a reduced viscosity of 0.16 Pa·s and a reduced bleeding rate of 2% at γ = 100 s−1 compared to pure cement grout. Furthermore, its compressive strength increased to approximately 30 MPa at day 7 and about 32.7 MPa at day 28. In this case, the cement-based grouting material delivered the optimal overall performance. The XRD and SEM analyses indicate that metakaolin and fly ash exhibited significant synergistic effects when mixed into the ternary mixtures, as evidenced by a faster hydration rate, a more even distribution of hydration products, and a denser microstructure. The results of this study provide a scientific basis for enhancing the performance of cement-based grouting materials by using metakaolin and fly ash as admixtures, offering a valuable reference for the design and applications of grouting materials in anchoring engineering.http://www.mtdzykt.com/article/doi/10.12363/issn.1001-1986.25.03.0214grouting materialoptimum mix ratioadmixturemetakaolinfly ashmicroscopic property |
| spellingShingle | Zhiyuan CHENG Junpeng YANG Wei XUE Daidong WEI Yimin WANG Impacts of metakaolin and fly ash on the performance of cement-based grouting materials in anchoring engineering Meitian dizhi yu kantan grouting material optimum mix ratio admixture metakaolin fly ash microscopic property |
| title | Impacts of metakaolin and fly ash on the performance of cement-based grouting materials in anchoring engineering |
| title_full | Impacts of metakaolin and fly ash on the performance of cement-based grouting materials in anchoring engineering |
| title_fullStr | Impacts of metakaolin and fly ash on the performance of cement-based grouting materials in anchoring engineering |
| title_full_unstemmed | Impacts of metakaolin and fly ash on the performance of cement-based grouting materials in anchoring engineering |
| title_short | Impacts of metakaolin and fly ash on the performance of cement-based grouting materials in anchoring engineering |
| title_sort | impacts of metakaolin and fly ash on the performance of cement based grouting materials in anchoring engineering |
| topic | grouting material optimum mix ratio admixture metakaolin fly ash microscopic property |
| url | http://www.mtdzykt.com/article/doi/10.12363/issn.1001-1986.25.03.0214 |
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