Abstract
Many important geotechnical and engineering geology properties of cement-treated dredged soil (CDS) depend on its the water content and void ratio (WC&VR). Based on the hydration model of cement, this study proposes time-evolution models of WC&VR in CDS, and verifies their reliability by fitting to experimental data. The two fitting parameters τ and β in the models depended only on the type of soil. Increasing the cement content (Aw) and initial water content (w0) of the dredged soil accelerated the decrease rate of WC&VR with curing time, but barely affected the duration of each stage in the WC&VR evolution curves. Next, the specific evolution laws and mechanisms of WC&VR in the curing process were fully discussed. The changes in WC&VR were consistent, and both trends exhibited typical four-stage characteristics: an initial steady stage, an accelerated descent stage, a decelerated descent stage, and a final steady stage. In microstructural analyses by X-ray diffraction, scanning electron microscopy, and thermo-gravimetric analysis, the evolution of WC&VR was found to be mainly related to the formation of cement hydration products, and the evolution characteristics well accorded with the hydration properties of cement.
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