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<p>The physicochemical combined method (PCCM), as an advanced approach, can treat dredged mud slurry (MS) more efficiently and repurpose it as high-performance embankment fill compared to the conventional cement solidification method (CCSM). However, the difference between the effects of wetting–drying (WD) cycles on PCCM-treated MS (PCCM-MS) and CCSM-treated MS (CCSM-MS) is not well understood. In this study, a series of laboratory experiments are performed to investigate the wetting–drying effects on the strength and microstructure of MS treated by PCCM and CCSM. Experimental results reveal that the strength variation during WD cycles occurs in two stages: an initial increase in Stage 1 (in the first three WD cycles) followed by a decline in Stage 2 (after the third WD cycle). PCCM demonstrates superiority over CCSM in resisting WD cycles during the treatment of MS. The variation in strength under WD cycles is linked to the failure modes of specimens. PCCM-MS specimens predominantly exhibit crack propagation mode, while CCSM-MS specimens show both crack propagation and desquamation modes. Microscopic tests indicate that the PCCM-MS specimens can better maintain integrity compared to CCSM-MS specimens during WD cycles. Furthermore, this study provides a preliminary understanding of the key mechanism underlying the better resistance capacity of PCCM-MS to WD cycles. These findings enhance the applicability of PCCM in the treatment of MS.</p>

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Evolution of strength and microstructure of dredged mud slurry treated by conventional cement solidification method and physicochemical combined method during wetting–drying cycles

  • 期刊论文

  • 发表日期：

    2026年7月9日

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  • Han Xiao,
  • Rongjun Zhang,
  • Junjie Zheng,
  • Xueyu Geng,
  • Yingchao Gao

摘要

The physicochemical combined method (PCCM), as an advanced approach, can treat dredged mud slurry (MS) more efficiently and repurpose it as high-performance embankment fill compared to the conventional cement solidification method (CCSM). However, the difference between the effects of wetting–drying (WD) cycles on PCCM-treated MS (PCCM-MS) and CCSM-treated MS (CCSM-MS) is not well understood. In this study, a series of laboratory experiments are performed to investigate the wetting–drying effects on the strength and microstructure of MS treated by PCCM and CCSM. Experimental results reveal that the strength variation during WD cycles occurs in two stages: an initial increase in Stage 1 (in the first three WD cycles) followed by a decline in Stage 2 (after the third WD cycle). PCCM demonstrates superiority over CCSM in resisting WD cycles during the treatment of MS. The variation in strength under WD cycles is linked to the failure modes of specimens. PCCM-MS specimens predominantly exhibit crack propagation mode, while CCSM-MS specimens show both crack propagation and desquamation modes. Microscopic tests indicate that the PCCM-MS specimens can better maintain integrity compared to CCSM-MS specimens during WD cycles. Furthermore, this study provides a preliminary understanding of the key mechanism underlying the better resistance capacity of PCCM-MS to WD cycles. These findings enhance the applicability of PCCM in the treatment of MS.