Dynamic of solidified dredged sediment based on different cements and confining pressures

In building coastal artificial islands, primary backfill materials may include dredged marine sediments that are mixed with various cements to become more appropriate for use as construction materials. After the artificial island is built, it will bear dynamic loading that arises from ocean waves or traffic. In this study, the marine sediments of Dalian Bay, China, and the resonant column method were utilised to analyse the dynamic characteristics of dredged marine sediments solidified with different cements under different confining pressures. Ordinary Portland cement and sulfoaluminate cement were used to compare the solidification effect. The analysis showed that for a given cement type, the maximum shear modulus increases and the minimum damping ratio decreases with an increase in confining pressure. For the same confining pressure, the dynamic shear modulus and damping ratio of sulfoaluminate-cement-solidified marine sediment are at maximum and minimum values, respectively. Ordinary-Portland-cement-solidified marine sediment can bear a larger shear stress before stiffness degradation.