Laboratory investigation of modified subgrade clay soil mix with steel slag and lime using static and dynamic test approach

ABSTRACT An experimental laboratory program was conducted to understand the feasibility of steel slag and lime in the subgrade layer. The test was conducted on natural clay soil, lime, lime + steel slag stabilized cohesive subgrade soil. The lime portions were 2%, 4% and 6%, respectively. Similarly, steel slag was added to 20%, 25% and 30%, respectively, by the mass of dry soil. The strength of lime soil and lime + steel slag + soil increases with increasing curing period. The 7-day unconfined compressive strength (UCS) 2% lime soil and soil+20% steel slag + 2% lime is 3.20 MPa and 3.87 MPa, respectively. Eventually, this study supports the use of steel slag and lime in the construction of subgrade stabilization. Therefore, it is found that a lightweight deflectometer can be used as a quick strength evaluating tool on modified subgrade soil in the laboratory.