## 4 Conclusions  
This study investigates the use of SWC to stabilize marine soft soil. Using GGBS, DA, and ACP as cementitious materials, and NS and SA as admixtures, SWC were prepared for stabilizing marine soft soil. Compared to cement, the stabilized soil using SWC demonstrated improved performance. The experimental results indicate that the optimized stabilized soil formulations significantly outperform cement soil in terms of compressive strength. After being mixed with seawater, the compressive strength of the stabilized soil and the cement soil did not exhibit significant changes. However, during seawater immersion, the cement soil samples degraded more severely, while the stabilized soil experienced less deterioration. X-ray diffraction analysis, scanning electron microscopy, infrared spectroscopy, and thermogravimetric analysis were used to explain the effects of SWC on the performance of the stabilized soil. The specific experimental conclusions are as follows:  
Figure 15: SEM image of GC (**a,b**) sample surface and EDS of GC (**b**) sample surface after being immersed in seawater for 60 d.  
1. The optimized formulations G4 and G7 had higher early and late compressive strengths compared to GC. G4 showed rapid early strength, with a 7-day compressive strength of 4.92 MPa, while G7 had superior late strength, reaching 5.97 MPa at 28 days. At 30% salinity, the 28-day compressive strengths were 2.64 MPa for GC, 5.91 MPa for G4, and 5.97 MPa for G7. G4 and G7 consistently outperformed GC, indicating the feasibility of seawater mixing. 2. When GC, G4, and G7 were immersed in pure water and seawater, it was observed that the stability of cement soil and stabilized soil in pure water was good. However, the resistance of cement soil GC to seawater corrosion was significantly worse than that of G4 and G7, with corrosion resistance coefficients of 66.97%, 90.48%, and 91.41% after 60 days of immersion, respectively. The surface of GC was covered with white crystals and exhibited many cracks, while the stabilized soil samples remained intact. This indicates that the stabilized soil has better resistance to seawater corrosion. 3. The hydration products in cement soil with seawater as mixing water were primarily calcium hydroxide (CH) and a small amount of C-S-H gel, with some Friedel salts present, which have low gel-forming capability. Existing studies indicate that CH and Friedel salts contribute little to the strength of the soil, which explains the low strength of cement soil. 4. In the stabilized soil, a significant amount of C-A-S-H, which has gel-forming properties, and AFt, which has a filling effect, were observed. Compared to the small amount of C-S-H in cement soil, the stabilized soil contained a substantial amount of C-A-S-H. It is generally accepted that C-A-S-H has a higher adsorption capacity for Cl\({}^{-}\) and SO\({}_{4}\)\({}^{2-}\) than C-S-H, which reduces the concentration of Cl\({}^{-}\) and SO\({}_{4}\)\({}^{2-}\) in the reaction solution. This effectively slows down the inhibition of the hydration reaction and the structural damage caused by crystal precipitation. 5. The analysis of the cement soil and stabilized soil samples after seawater immersion confirmed the presence of calcium carbonate and calcium sulfate on the surface and inside the cement soil sample, leading to the expansion and cracking of the structure. In contrast, no such issues were observed in the stabilized soil samples. Z.Z. : Methodology, Validation, Formal analysis, Investigation, Data curation, and Writing--original draft. C.G. : Investigation, Data curation, and Resources. S.H. : Conceptualization, Writing--review and editing, and Supervision. Y.Z. : Writing--review and editing, and Supervision. D.Z. : Writing--review and editing, and Supervision. Y.B. : Investigation and Resources. Z.Y. : Investigation and Resources. All authors have read and agreed to the published version of the manuscript.