ارزيابي كارايي پودر سرباره فولاد به عنوان پركننده در تراكم و به‌سازي خاك

eva‎luating the effectiveness of steel slag powder as a filler in soil compaction an‎d improvement

زمين شناسي

In this research, the engineering geological behavior of a low-plasticity silt (ML) an‎d the potential for its stabilization using Electric Arc Furnace (EAF) slag were investigated. The studied soil, located in the north of Isfahan, is characterized by a high percentage of fine-grained particles, low cohesion, an‎d high sensitivity to moisture changes. Consequently, it exhibits high collapsible potential an‎d limited mechanical strength. To eva‎luate the effect of steel slag, soil samples were prepared with various weight percentages of slag (0.5, 1, 2, 4, 5, 6, 8, 10, an‎d 15%). A series of geotechnical tests, including stan‎dard compaction, double oedometer (consolidation), Unconfined Compressive Strength (UCS), an‎d direct shear tests, were conducted on the specimens. Finally, the soil improvement achieved by the steel slag additive was analyzed. The results of this study indicate that the addition of steel slag increases the maximum dry unit weight an‎d significantly improves the Unconfined Compressive Strength of the soil. The most significant improvement in mechanical behavior was observed at an optimum slag content of 1%, indicating the effective role of physical interactions between the slag particles an‎d the silty soil. Furthermore, since the primary issue with this soil is its collapsible nature, the addition of 1%to 2% steel slag significantly reduced the collapse potential. These findings demonstrate that steel slag can be utilized as an effective, economical, an‎d environmentally friendly additive for the stabilization of collapsible silty soils. A key mechanism behind the improved soil behavior is the physical filler role of the slag; the slag particles effectively fill the voids between the silt particles, leading to reduced effective porosity, increased grain-to-grain contact, an‎d stabilization of the soilʹs internal structure.

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