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<p>Dredged slurry with high water content and low permeability is prone to drainage clogging during vacuum preloading, limiting its direct use in land reclamation and typically requiring cement-based treatment. To explore a lower-carbon alternative to conventional treatment, this study examined a waste-based composite binder in which cement was partially replaced by steel slag and blast-furnace slag combined with lime. Building on previously identified drainage-favorable formulations, this study evaluated the post-consolidation strength and microstructural evolution of the treated slurries. Unconfined compressive strength tests were conducted on specimens cured for 7, 14, and 28&#xa0;days, and scanning electron microscopy (SEM) was used to examine their fabric evolution and hydration features. Results showed that strength increased with both curing age and binder dosage. At a total binder dosage of 2%, specimen treated by 11% cement, 40% steel slag, 40% blast-furnace slag, and 9% lime (C11SS40S40L9) presented the highest strength. The SEM observations indicated a transition from a dispersed lamellar fabric to a bonded granular framework, accompanied by progressive development of hydration-related morphological features. Its superior performance is associated with early flocculation, consolidation-induced densification, and subsequent hydration cementation.</p>

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Strength enhancement and microstructural evolutions of dredged slurry stabilized with waste-modified composite binder

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年8月5日

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  • Yichun Liu,
  • Hua Zhang,
  • Taili Zhang,
  • Nan Wang,
  • Yaochun Wu

摘要

Dredged slurry with high water content and low permeability is prone to drainage clogging during vacuum preloading, limiting its direct use in land reclamation and typically requiring cement-based treatment. To explore a lower-carbon alternative to conventional treatment, this study examined a waste-based composite binder in which cement was partially replaced by steel slag and blast-furnace slag combined with lime. Building on previously identified drainage-favorable formulations, this study evaluated the post-consolidation strength and microstructural evolution of the treated slurries. Unconfined compressive strength tests were conducted on specimens cured for 7, 14, and 28 days, and scanning electron microscopy (SEM) was used to examine their fabric evolution and hydration features. Results showed that strength increased with both curing age and binder dosage. At a total binder dosage of 2%, specimen treated by 11% cement, 40% steel slag, 40% blast-furnace slag, and 9% lime (C11SS40S40L9) presented the highest strength. The SEM observations indicated a transition from a dispersed lamellar fabric to a bonded granular framework, accompanied by progressive development of hydration-related morphological features. Its superior performance is associated with early flocculation, consolidation-induced densification, and subsequent hydration cementation.