Strength characteristic and micro-mechanism of organic dredged sludge solidified by cement incorporating sodium persulfate

Shiquan Wang; Xingxing He; Guanghua Cai; Jiangshan Li; Huajin Qin; Yuanyuan Ma; Shunmei Gong; Lei Lang

Developments in the Built Environment (Mar 2024)

Strength characteristic and micro-mechanism of organic dredged sludge solidified by cement incorporating sodium persulfate

Shiquan Wang,
Xingxing He,
Guanghua Cai,
Jiangshan Li,
Huajin Qin,
Yuanyuan Ma,
Shunmei Gong,
Lei Lang

Affiliations

Shiquan Wang: National Engineering Research Center of Coal Mine Water Hazard Controlling, School of Resources and Civil Engineering, Suzhou University, Suzhou, 234000, China
Xingxing He: State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China; State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing, 100084, China; Jiangsu Institute of Zoneco Soil Co. Ltd., Yixing, 214200, China; Corresponding author. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China.
Guanghua Cai: School of Civil Engineering, Nanjing Forestry University, Nanjing, 210037, China
Jiangshan Li: State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China
Huajin Qin: National Engineering Research Center of Coal Mine Water Hazard Controlling, School of Resources and Civil Engineering, Suzhou University, Suzhou, 234000, China
Yuanyuan Ma: National Engineering Research Center of Coal Mine Water Hazard Controlling, School of Resources and Civil Engineering, Suzhou University, Suzhou, 234000, China
Shunmei Gong: National Engineering Research Center of Coal Mine Water Hazard Controlling, School of Resources and Civil Engineering, Suzhou University, Suzhou, 234000, China
Lei Lang: State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China

Journal volume & issue: Vol. 17
p. 100323

Abstract

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Cement-based solidification is a widely used sustainable technology for transforming waste dredged sludge (DS) into backfill materials. This study developed a novel solidification/oxidization synergistic (SOS) method, using Portland cement as a binder and sodium persulfate (SP) as an oxidant, for treating the organic DS with different fulvic acid (FA) content. The results demonstrated that adding SP could significantly improve the UCS of the cement-solidified DS doped with FA. When the FA content was 4%, the 28-day UCS of the sample with 25% cement content was only 160.5 kPa. The addition of 6% SP increased the UCS to 2225.5 kPa, which was 15.1 times that of the sample without SP. However, excessive SP hydrolyzed to produce a large amount of sulfuric acid, leading to a low pH value of the pore solution. This in turn hindered further persulfate activation and cement hydration, which was detrimental to the strength of cement-solidified DS.

Published in Developments in the Built Environment

ISSN: 2666-1659 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Engineering (General). Civil engineering (General); Technology: Building construction
Website: https://www.journals.elsevier.com/developments-in-the-built-environment/

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