Abstract: A laboratory simulation method is used in this study to examine the effect of marine environment on the strength of cemented soil mixed with composite ferronickel slag powder. In the experiment, ferronickel slag powder and mineral powder were mixed into admixture, and then added to a cemented soil. Through erosion analysis, unconfined compression tests, and SEM and EDS test analysis, the influence of marine environment on the apparent characteristics, strength and micro-morphology of this modified cemented soil was studied. Results show that in marine environment, the modified cemented soil is eroded and its strength deteriorated. And its erosion degradation is intensifying over time. However, its component of composite ferronickel slag powder has good durability with micro aggregate effect and active effect. Thus, this type of composite powder can not only improve the strength performance of cemented soil but also reduce its erosion in marine environment and alleviate its strength deterioration.

Key words: cemented soil, composite ferronickel slag powder, deterioration of strength, microstructure, erosion