An experimental study on microanalytical characterizations and service performances of landfill modified municipal sludge liner materials in contact with leachate
文献类型：期刊论文
| 作者 | Liu, Mengyi; Lu, Haijun; Wang, Chaofeng; Liu, Yajun |
| 刊名 | CASE STUDIES IN CONSTRUCTION MATERIALS
 |
| 出版日期 | 2023-06-01 |
| 卷号 | 18 |
| ISSN号 | 2214-5095 |
| 关键词 | Modified municipal sludge Liner materials Landfill leachate Service performances Microstructure characteristics |
| 英文摘要 | This study aimed to evaluate the long-term service performance of modified municipal dewatered sludge as a landfill liner barrier. Industrial calcium-containing solid waste was used as a modified material for sludge. The shear strength parameters (cohesion c, friction angle 9), compressive strength, and hydraulic conductivity of the modified sludge were studied using direct shear, uniaxial compression, and penetration tests. The leaching toxicity, hydration products, and microscopic morphology of the modified sludge were determined using atomic emission spec-troscopy, X-ray diffraction, scanning electron microscopy, and energy dispersion spectroscopy. The corrosion mechanisms of the landfill leachate and acid-base chemical solution on the modified sludge liner barrier were revealed. Under the long-term corrosive environment of the landfill leachate and acid-base chemical solution, the shear strength parameters, i.e., cohesion (c) and friction angle (9) had values in the ranges of 0.51 -3.79 MPa and 6.52 -37.58 degrees of the modified sludge, respectively. The uniaxial compressive strength reached 2.70 -22.92 MPa, and the permeability coefficient ranged from 0.12 x 10-8 to 3.97 x 10-8 cm/s. After long-term corrosion by landfill leachate and an acid-base chemical solution, the modified sludge liner barrier still had significant bearing capacity and water-blocking properties. Under leachate corrosion, sulfate corrosion (such as ettringite and thaumasite formation) occurred, the modified sludge and some structures were damaged. Under an acidic chemical corrosion solution, alkaline substances, such as calcium hydroxide with hydrogen ions, underwent solvent-out crystallization and chemical dissolution reactions, which caused the decomposition of hydrated gel products such as C-S-H inside the specimen. Under alkaline chemical solution corrosion, the active components in the modified sludge underwent a hydration reaction to form ettringite, C-S-H, etc. |
| 学科主题 | Construction & Building Technology ; Engineering ; Materials Science |
| 语种 | 英语 |
| 出版者 | ELSEVIER |
| WOS记录号 | WOS:000910444000001 |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/34806]  |
| 专题 | 中科院武汉岩土力学所 |
| 作者单位 | 1.Wuhan Polytechnic University; 2.Chinese Academy of Sciences; Wuhan Institute of Rock & Soil Mechanics, CAS |
| 推荐引用方式 GB/T 7714 | Liu, Mengyi,Lu, Haijun,Wang, Chaofeng,et al. An experimental study on microanalytical characterizations and service performances of landfill modified municipal sludge liner materials in contact with leachate[J]. CASE STUDIES IN CONSTRUCTION MATERIALS,2023,18. |
| APA | Liu, Mengyi,Lu, Haijun,Wang, Chaofeng,&Liu, Yajun.(2023).An experimental study on microanalytical characterizations and service performances of landfill modified municipal sludge liner materials in contact with leachate.CASE STUDIES IN CONSTRUCTION MATERIALS,18. |
| MLA | Liu, Mengyi,et al."An experimental study on microanalytical characterizations and service performances of landfill modified municipal sludge liner materials in contact with leachate".CASE STUDIES IN CONSTRUCTION MATERIALS 18(2023). |
入库方式： OAI收割
来源：武汉岩土力学研究所
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