重金属污染土防渗注浆材料的力学性能
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| Published in | 中国有色金属学报：英文版 Vol. 24; no. 10; pp. 3316 - 3323 |
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| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
2014
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1003-6326 |
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| Bibliography: | heavy metal contaminated soil;composite grouting material;gel time;compressive strength;microstructure 43-1239/TG Yu-you YANG,Jian-qiang WANG,Hai-jun DOU（1. School of Engineering and Technology, China University of Geosciences（Beijing）, Beijing 100083, China; 2. Yunnan Geological Engineering Investigation Design and Research Institute, Kunming 650041, China） Cement-based composite grouting materials were used to construct grouting cutoff wall for heavy metal contaminated soil in non-ferrous metal mining areas. Cement, fly ash, and slag as principal ingredients were mixed with water glass in different ways to produce three composite grouting materials. In order to investigate the effect of water glass mixing ratio, Baume degree, fly ash and slag contents on the mechanical properties of the composite grouting materials, particularly their gel time and compressive strength, the beaker-to-beaker method of gel time test and unconfined compressive strength test were conducted. In addition, the phase composition and microstructure of the composite grouting materials were analyzed by the X-ray diffraction（XRD） and scanning electron microscope（SEM） techniques. The test results show that their gel time increases when water glass mixing ratio and Baume degree increase. The gel time increases dramatically when fly ash is added, but decreases slightly if fly ash is partly replaced by slag. When the mixing ratio of water glass is below 20%, their compressive strength increases with the increases of the ratio; when the ratio is above 20%, it significantly decreases. The compressive strength also tends to increase as Baume degree increases, and improves if fly ash and slag are added. |
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| ISSN: | 1003-6326 |