Mechanical Strength, Permeability, and Micromechanics of Municipal Sludge Modified with Calcium-Containing Industrial Solid Waste and Powdered Construction Waste
文献类型：期刊论文
| 作者 | Liu, Yajun; Lu, Haijun; Liu, Mengyi; He, Yifan; Yu, Hanxi; He, Bin; Wan, Yong |
| 刊名 | WATER
 |
| 出版日期 | 2023 |
| 卷号 | 15期号:1 |
| 关键词 | modified sludge industrial waste powdered construction waste mechanical strength microstructure |
| 英文摘要 | Each year, China produces a substantial amount of municipal sludge, industrial waste (slag, fly ash, and desulfurized gypsum), and construction waste, while its recycling rate is low. If not disposed in a properly and timely manner, this inequity can have serious environmental impacts. This study aimed to prepare a new type of modified sludge material with high strength, low shrinkage, and low permeability by curing municipal sludge with industrial waste (slag, desulfurized gypsum, and fly ash) and powdered construction waste. At specific maintenance ages, the modified sludge material was examined for shrinkage deformation, water content, compressive strength, and hydraulic conductivity. The modified sludge material was also tested by scanning electron microscopy (SEM + EDS), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR) tests. The hydration products, micromorphology, and elemental composition of modified sludge were also analyzed at specific maintenance ages. These analyses revealed the mechanism of solidification of municipal sludge by industrial waste and powdered construction waste and the changes in the microstructure of the sludge. The results showed that the compressive strength of the modified sludge ranged from 3.83 to 8.63 MPa, volumetric shrinkage ranged from 2.12 to 12.68%, and hydraulic conductivity ranged from 1.65 x 10(-8) to 2.21 x 10(-7) cm/s after 28 d of maintenance. The active substances, such as SiO2, Al2O3, and CaO, in the industrial waste, powdered construction waste, and municipal sludge were subjected to a hydration reaction in an alkaline environment to produce dense blocks, agglomerates of C-S-H, ettringite, gismondine, and other hydration products. The compressive strength of the modified sludge increased, and its internal structure was dense. |
| 学科主题 | Environmental Sciences & Ecology ; Water Resources |
| 语种 | 英语 |
| WOS记录号 | WOS:000909074600001 |
| 出版者 | MDPI |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/34744]  |
| 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, Yajun,Lu, Haijun,Liu, Mengyi,et al. Mechanical Strength, Permeability, and Micromechanics of Municipal Sludge Modified with Calcium-Containing Industrial Solid Waste and Powdered Construction Waste[J]. WATER,2023,15(1). |
| APA | Liu, Yajun.,Lu, Haijun.,Liu, Mengyi.,He, Yifan.,Yu, Hanxi.,...&Wan, Yong.(2023).Mechanical Strength, Permeability, and Micromechanics of Municipal Sludge Modified with Calcium-Containing Industrial Solid Waste and Powdered Construction Waste.WATER,15(1). |
| MLA | Liu, Yajun,et al."Mechanical Strength, Permeability, and Micromechanics of Municipal Sludge Modified with Calcium-Containing Industrial Solid Waste and Powdered Construction Waste".WATER 15.1(2023). |
入库方式： OAI收割
来源：武汉岩土力学研究所
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