Influence Mechanism of Fulvic Acid on the Strength of Cement-Solidified Dredged Sludge
文献类型：期刊论文
| 作者 | Wang, Shiquan3; He, Xingxing4; Gong, Shunmei3; Cai, Guanghua1; Lang, Lei5; Ma, Hongrui3; Niu, Zhiyong3; Zhou, Fangming3 |
| 刊名 | WATER
 |
| 出版日期 | 2022-09-01 |
| 卷号 | 14期号:17页码:- |
| 关键词 | cement solidified fulvic acid hydration heat organic matter sludge strength |
| 英文摘要 | Cement solidification was a widely used method to broaden the resource utilization of dredged sludge. However, the organic matter in sludge limit the application of cement solidification. The fulic acid (FA) was used to simulate the natural organic matter in sludge. With the increase in FA content, the sludge gradually changed from low-liquid-limit clay to high-liquid-limit clay. The unconfined compression test showed that the strength of cement-solidified dredged sludge (CDS) decreased with FA content. The influence mechanism of the FA on cement solidification was revealed by a water content test, a hydration heat test, scanning electron microscopy, and thermogravimetric analysis. FA hindered the conversion of pore water to combined water and reduced the hydration heat inside CDS. The FA in sludge weakened the internal bond within CDS by hindering the development of C-S-H gel from spheroidal to flake. At the same time, the final amount of hydrates such as C-S-H, C-A-H and AFt also decreased in the CDS containing FA. The weakening mechanism of FA on the strength of CDS can be attributed to three aspects: (1) FA adsorbed on the surface of cement minerals and hindered the contact between cement minerals and pore water; (2) acidic FA reduced the pH of the pore liquid in CDS; (3) the carboxyl and hydroxyl functional groups of FA adsorbed calcium ions in pore liquid through ion coordination. |
| 学科主题 | Environmental Sciences & Ecology ; Water Resources |
| 语种 | 英语 |
| WOS记录号 | WOS:000851967100001 |
| 出版者 | MDPI |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/35437]  |
| 专题 | 中科院武汉岩土力学所 |
| 作者单位 | 1.School of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China 2.Correspondence: hexingxing16@mails.ucas.ac.cn (X.H.); budameiqian@163.com (S.G.) 3.National Engineering Research Center of Coal Mine Water Hazard Controlling, School of Resources and Civil Engineering, Suzhou University, Suzhou 234000, China 4.State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China 5.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China |
| 推荐引用方式 GB/T 7714 | Wang, Shiquan,He, Xingxing,Gong, Shunmei,et al. Influence Mechanism of Fulvic Acid on the Strength of Cement-Solidified Dredged Sludge[J]. WATER,2022,14(17):-. |
| APA | Wang, Shiquan.,He, Xingxing.,Gong, Shunmei.,Cai, Guanghua.,Lang, Lei.,...&Zhou, Fangming.(2022).Influence Mechanism of Fulvic Acid on the Strength of Cement-Solidified Dredged Sludge.WATER,14(17),-. |
| MLA | Wang, Shiquan,et al."Influence Mechanism of Fulvic Acid on the Strength of Cement-Solidified Dredged Sludge".WATER 14.17(2022):-. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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