Development of Steel Slag-Based Solidification/Stabilization Materials for High Moisture Content Soil

To solve the problems of high moisture content, high viscosity, and poor engineering mechanical properties of soil, this paper using with steel slag (SS) and desulfurization ash (DS) as initial raw materials, realizing the cooperative treatment of solid waste and solidification of silt soil. The synergistic utilization of SS and DS can reduce the production cost of curing agent and promote its own consumption. According to blended cement of various SS contents and inspected compressive strength performances, the most suitable raw materials ratio was selected. The best formula for this curing agent is cement:steel slag = 3:7 with 5% DS, and its 28-day compressive strength can reach 30 MPa. The experiment shows that the effect of DS and Na2SO4 reagent with the same quality on early compressive strength improvement of cement and SS system is not much different. In this study, the mineral composition and microstructure of different gel system blocks were characterized by XRD, SEM and EDX, and a large number of webbed structures were found in the SEM test, which was not seen in previous studies. Besides, unconfined compressive strength (UCS), water resistance, and toxic characteristic leaching procedure (TCLP) were used to evaluate silt solidified soil properties. The results demonstrated that the solidified silt could meet not only the standard of general subgrade; but also has a partial stabilization effect of heavy metal ions.