Experimental study on solidified dredged sediment with MgO and industrial waste residue

To improve the engineering performance of dredged sediment, a solidification study using reactive MgO in combination with desulfurization gypsum (DG) and steel slag (SS) was carried out. The results indicated that the optimum contents of MgO, DG and SS in the solidified sediment were 7.62%, 11.31% and 5.80%, respectively. The encapsulation, cementation and filling of hydration products of MgO-DG-SS made the soil microstructure more stable, thus significantly improving the mechanical properties of sediment. Meanwhile, the MgO-DG-SS could effectively immobilize the heavy metals in sediment through chemical bonding and adsorption of hy-dration products.

Automated summary

A solidification study was conducted to improve the engineering performance of dredged sediment, using reactive MgO combined with desulfurization gypsum (DG) and steel slag (SS). The optimal contents of MgO, DG, and SS in the solidified sediment were found to be 7.62%, 11.31%, and 5.80%, respectively. The encapsulation, cementation, and filling of hydration products of MgO-DG-SS improved the soil microstructure, leading to significant enhancement of the sediment's mechanical properties. Moreover, the MgO-DG-SS effectively immobilized the heavy metals in the sediment through chemical bonding and adsorption of hydration products.