Abstract
Over the past few years, soil-cement has been widely used in marine geotechnical engineering; meanwhile, the safety of soil-cement in marine environment has attracted wide attention. In order to study the influence of composite ferronickel slag powder on the strength and micro morphology of soil-cement in marine environment, the composite nickel iron slag powder was added into the soil-cement in this paper. The unconfined compressive strength test, erosion resistance coefficient analysis, SEM, and EDS test analysis of soil-cement were carried out.. Results showed that the marine environment had great influences on the strength of soil-cement, and the addition of compound nickel-iron slag powder can enhance the strength of soil-cement, and the deterioration of the strength of soil-cement is reduced. In addition, the compound ferronickel slag powder has microaggregate effect, morphological effect, and activation effect, which not only improves compaction rate of soil-cement and prevents invasion of erosive ions in marine environment but also has positive effects on the performance of soil-cement.
Highlights
Ferronickel slag is the industrial solid waste residue produced when nickel alloy is smelted, which will result in serious environmental pollution when not being handled properly
Ferronickel slag powder is featured with potential activation [26], low price, and durability [27]. is paper has, through mixing compound admixture made by ferronickel slag powder and mineral powder into soil-cement, compared and analyzed performance difference of soil-cement in freshwater and marine environment; besides, analyzed microstructure of soil-cement by SEM-EDS test and studied solidification mechanism of above admixture on soil-cement
Compared to early 60 days and 90 days, the growth trend in curve of relationship between the strength of soil-cement and additive amount of ferronickel slag powder rises dramatically, which is obvious in the range between 20% and 40% for additive amount of ferronickel slag powder. e reason for the increase in the strength of soilcement was due to the pozzolanic effect of cement and composite nickel-iron slag powder
Summary
Ferronickel slag is the industrial solid waste residue produced when nickel alloy is smelted, which will result in serious environmental pollution when not being handled properly. Some scholars have used ferronickel slag for studying the production of cement [23], concrete [24], and synthetic materials [25], but there are few studies on applying it to soil-cement. Ferronickel slag powder is featured with potential activation [26], low price, and durability [27]. Grinding ferronickel slag into powder and applying it to soil-cement material has effectively solved the problem of waste ferronickel slag and reduced the construction cost of engineering
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