Experiment study of solidification performance and long-term mechanical properties of dredger filled mud

Solidification tests were performed on dredger fill mud with high moisture content in Binhai New Area of Tianjin using the powder curing agent. The effects of moisture content, curing time, and curing agent content on the strength of solidified soils were analyzed. The test results show that the most appropriate curing agent content is 3% considering the strength demand of economic rationality. The unconfined compressive strength with the curing duration of 60 days was defined as a benchmark. An equation for predicting unconfined compressive strength of the solidified soils was proposed using two variables, i.e., water cement ratio and curing time. The long-term strength properties of solidified soils with the moisture content of 160% and the age of 28 days were analyzed by the triaxial rheological tests. The test results show that the solidified soils present similar creep behaviors to the structural soft clays. Meanwhile, the long-term strength of solidified soils can be determined using the isochronous curve. The shear strength indexes under long-term loads can also be determined, providing theoretical support for the security applications of solidified soils.