@article{5cab2ad552454335b02c675f99f387bd,
title = "Engineering and microstructure properties of contaminated marine sediments solidified by high content of incinerated sewage sludge ash",
abstract = "Management of incinerated sewage sludge ash (ISSA) and dredged contaminated marine sediments (CMSs) is a great challenge for Hong Kong and other coastal cities due to limited landfilling capacity. The present study investigates the use of high content (20% of sediment by mass) of ISSA in combination with cement/lime for solidification/stabilization (S/S) treatment of CMSs to provide a way to reuse the wastes as construction materials. The results showed that ISSA being a porous material was able to absorb a large amount of water rendering a more efficient solidification process of the marine sediment which normally had a very high water content (∼80%). The S/S treatment improved the engineering properties of the sediment, but reduced the workability, especially for the lime-treated samples. Lime can be used to replace ordinary Portland cement (OPC) for better heavy metal immobilization and carbon emission reduction. The hardened sediment samples prepared with 10% of lime and 20% of ISSA could attain a strength of 1.6 MPa after 28 d of curing. In addition, leaching tests confirmed that there was no environmental risk induced by these stabilized materials. The formation of hydrated cementitious compounds including calcium silicate hydrate (C–S–H)/calcium aluminate silicate hydrate (C-A-S-H)/hydrocalumite/calcite was mainly responsible for the strength development in the ISSA/lime-treated sediments.",
keywords = "Construction material, Contaminated marine sediment (CMS), Heavy metals, Incinerated sewage sludge ash (ISSA), Solidification/stabilization (S/S)",
author = "Li, {Jiang Shan} and Yifan Zhou and Xin Chen and Qiming Wang and Qiang Xue and Tsang, {Daniel C.W.} and Poon, {Chi Sun}",
note = "Funding Information: Prof. Jiang -S han Li is professor of geotechnical engineering at Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, the director of IRSM-CAS/HKPolyU Joint Laboratory on Solid Waste Science, and Hong Kong scholar. His research areas include geo-environmental engineering and solid waste recycling. He is principal investigator (PI) of one project sponsored by National Natural Science Foundation of China (NSFC) and sub-PI of National Key R&D Program of China. Prof. Li is a member of Youth Working Committee of Soil Mechanics and Geotechnical Engineering Branch in Chinese Civil Engineering Society, Tailing and Mine Wastes Committee of International Society for Soil Mechanics and Geotechnical Engineering, Youth Working Committee of Environmental Geotechnical Engineering Branch in Chinese Society for Rock Mechanics and Engineering, and journal editor of Environmental Geotechnics. Prof. Li authored over 80 journal papers, among which 69 papers were published in international journals and indexed by SCI database. Funding Information: The authors would like to thank the financial support of National Natural Science Foundation of China (Grant Nos. 51861165104 and 51625903 ), and National Key Research and Development Project (Grant No. 2019YFC1804002 ). Publisher Copyright: {\textcopyright} 2021 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences Copyright: Copyright 2021 Elsevier B.V., All rights reserved.",
year = "2021",
doi = "10.1016/j.jrmge.2020.10.002",
language = "English",
journal = "Journal of Rock Mechanics and Geotechnical Engineering",
issn = "1674-7755",
publisher = "Chinese Academy of Sciences",
}