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Ordinary Portland Cement (OPC) has been extensively employed to stabilize soft clay. However, OPC exhibits inefficiency in treating high water content soft clay, necessitating a high dosage of OPC and resulting in significant CO2 emissions. Expansive agent (EA) is a cement additive that, during the hydration process, expands and fills some of the pores in the matrix. It has the potential to enhance the strength performance of OPC-treated soft clay. However, commercially available EA is currently costly and challenging to apply in cement-stabilized soft soil. In this study, EA derived from waste, including freshwater sludge (FS) and carbide slag (CS), was developed, and the feasibility of utilizing this waste-based EA in soft clay stabilization was examined. The EAs (both FS-CS based EA and commercial EA) were mixed with OPC and ground granulated blast-furnace slag (GGBS) for the stabilization of soft clay. The findings revealed that both FS-CS-based EA and commercial EA enhanced the unconfined compressive strength (UCS) of stabilized clay. FS-CS-based EA exhibited significantly better performance than the commercial EA in both OPC-stabilized clay and GGBS-stabilized clay. The strength enhancement effect of the FS-CS-based EA on GGBS-stabilized clay was significantly more pronounced than its effect on OPC-stabilized clay.

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Utilization of Waste-Based Expansive Agents for Soft Clay Stabilization

  • 会议论文

  • 发表日期：

    2025年

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  • Jiawei Tan,
  • Bo Xu,
  • Junde Qin,
  • Yaolin Yi

摘要

Ordinary Portland Cement (OPC) has been extensively employed to stabilize soft clay. However, OPC exhibits inefficiency in treating high water content soft clay, necessitating a high dosage of OPC and resulting in significant CO2 emissions. Expansive agent (EA) is a cement additive that, during the hydration process, expands and fills some of the pores in the matrix. It has the potential to enhance the strength performance of OPC-treated soft clay. However, commercially available EA is currently costly and challenging to apply in cement-stabilized soft soil. In this study, EA derived from waste, including freshwater sludge (FS) and carbide slag (CS), was developed, and the feasibility of utilizing this waste-based EA in soft clay stabilization was examined. The EAs (both FS-CS based EA and commercial EA) were mixed with OPC and ground granulated blast-furnace slag (GGBS) for the stabilization of soft clay. The findings revealed that both FS-CS-based EA and commercial EA enhanced the unconfined compressive strength (UCS) of stabilized clay. FS-CS-based EA exhibited significantly better performance than the commercial EA in both OPC-stabilized clay and GGBS-stabilized clay. The strength enhancement effect of the FS-CS-based EA on GGBS-stabilized clay was significantly more pronounced than its effect on OPC-stabilized clay.