Effect of Progressive Substitution of Cement and Lime by Powdered Shells Used as a Curing Agent for Dredged Soil in a Port Area  

作　　者：SUN Yang WANG Faxin SU Yaying LI Yiwei HE Feng 孙阳(College of Harbour,Coastal and Offshore Engineering,Hohai University,Nanjing 210098,China;Huai'an Research Institute,Hohai University,Huai'an 223025,China)

机构地区：[1]College of Harbour,Coastal and Offshore Engineering,Hohai University,Nanjing 210098,China [2]Huai'an Research Institute,Hohai University,Huai'an 223025,China [3]Jiangsu Fangyang Industrial Investment Corp.Ltd.,Lianyungang 210098,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2025年第1期88-102,共15页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the Science and Technology Project of Jiangsu Provincial Transportation Department(No.2022Y13)。

摘　　要：This study aimed to address the challenges of solid waste utilization,cost reduction,and carbon reduction in the treatment of deep-dredged soil at Xuwei Port in Lianyungang city of China.Past research in this area was limited.Therefore,a curing agent made from powdered shells was used to solidify the dredged soil in situ.We employed laboratory orthogonal tests to investigate the physical and mechanical properties of the powdered shell-based curing agent.Data was collected by conducting experiments to assess the role of powdered shells in the curing process and to determine the optimal ratios of powdered shells to solidified soil for different purposes.The development of strength in solidified soil was studied in both seawater and pure water conditions.The study revealed that the strength of the solidified soil was influenced by the substitution rate of powdered shells and their interaction with cement.Higher cement content had a positive effect on strength.For high-strength solidified soil,the recommended ratio of wet soil:cement:lime:powdered shells were 100:16:4:4,while for low-strength solidified soil,the recommended ratio was 100:5.4:2.4:0.6.Seawater,under appropriate conditions,improved short-term strength by promoting the formation of expansive ettringite minerals that contributed to cementation and precipitation.These findings suggest that the combination of cement and powdered shells is synergistic,positively affecting the strength of solidified soil.The recommended ratios provide practical guidance for achieving desired strength levels while considering factors such as cost and carbon emissions.The role of seawater in enhancing short-term strength through crystal formation is noteworthy and can be advantageous for certain applications.In conclusion,this research demonstrates the potential of using a powdered shell-based curing agent for solidifying dredged soil in an environmentally friendly and cost-effective manner.The recommended ratios for different strength requirements offer valuable insights for p

关 键 词：carbon reduction and solidification dredged soil abandoned shells orthogonal test chemical additives(lime and cement) unconfined compressive strength(UCS) 

分 类 号：TU44[建筑科学—岩土工程]