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<p>Sediment slurry dredged from the waterways is increasingly used in land reclamation projects. A significant issue is that sediment slurry contains high water content, making dewatering difficult and time-consuming. This study treated dredged sediment slurry with ground granulated blast furnace slag (GGBS) activated by reactive MgO denoted as GM using the Chemical-Physical combined method. A series of experimental tests were performed to evaluate the combined effect of GM- flocculant (APAM), marked as (GM-APAM), and GM- Tartaric acid, represented as (GM-TA), on the solidification behavior of GM-treated sediment slurry. Experimental results showed that the combined effect of GM-APAM mixes showed a higher settlement rate, enhanced mechanical dewatering efficiency, better strength development, and dense solidified microstructure compared to GM and GM-TA mixes. The GM-APAM mixes showed 2.97- 4.91 times higher UCS values than those of GM-TA mixes. Microstructural analysis indicated that the primary hydration product across all mixtures was calcium silicate hydrate (C-S-H). In addition to C-S-H, hydrotalcite, and calcium aluminum silicate hydrate (C-A-S-H) have been identified as main hydration products of the mixes. Furthermore, GM-APAM mixes had higher Ca/Si and Mg/Al ratios, indicating that more C-S-H and hydrotalcite were produced than other mixes.</p>

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Effect of flocculant and Tartaric acid on solidification behavior of GGBS-MgO solidified dredged slurry treated with Chemical-Physical combined method.

  • 期刊论文

  • 发表日期：

    2025年5月27日

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  • A. K. Mastoi,
  • S. N. Alidekyi,
  • M. Ali,
  • I. A. Channa,
  • A. A. Dahri,
  • U. Khan

摘要

Sediment slurry dredged from the waterways is increasingly used in land reclamation projects. A significant issue is that sediment slurry contains high water content, making dewatering difficult and time-consuming. This study treated dredged sediment slurry with ground granulated blast furnace slag (GGBS) activated by reactive MgO denoted as GM using the Chemical-Physical combined method. A series of experimental tests were performed to evaluate the combined effect of GM- flocculant (APAM), marked as (GM-APAM), and GM- Tartaric acid, represented as (GM-TA), on the solidification behavior of GM-treated sediment slurry. Experimental results showed that the combined effect of GM-APAM mixes showed a higher settlement rate, enhanced mechanical dewatering efficiency, better strength development, and dense solidified microstructure compared to GM and GM-TA mixes. The GM-APAM mixes showed 2.97- 4.91 times higher UCS values than those of GM-TA mixes. Microstructural analysis indicated that the primary hydration product across all mixtures was calcium silicate hydrate (C-S-H). In addition to C-S-H, hydrotalcite, and calcium aluminum silicate hydrate (C-A-S-H) have been identified as main hydration products of the mixes. Furthermore, GM-APAM mixes had higher Ca/Si and Mg/Al ratios, indicating that more C-S-H and hydrotalcite were produced than other mixes.