Feasibility Study on Subgrade Stabilization of Pavement Using Lime and Fly Ash as Admixtures

The nature of the underlying layers of the pavement determines its life. Among these layers, the subgrade plays a very crucial role in aiding the load transfer mechanism as well as facilitates the drainage mechanism. India, being a developing nation, has focused a lot on infrastructure development of which highways are a huge part. Being an agriculturally driven nation, the available land for development of these pavements is agricultural in nature with soils of poor mechanical properties. Thus, in order to keep up with this pace, there's a need for an innovative solution and such solution is the soil stabilization technique. The work is focused on identifying the impact of lime and fly ash-induced admixture's impact on the various parameters of soil including the CBR, Maximum Dry Density (MDD), Liquid Limit (L.L), Plastic Limit (P.L), etc ..,. black cotton soil was blended by varying lime at 2% for three trials by keeping the fly ash constant at 7% of the total weight of the soil sample. The percentage increase in moisture content is 9.09% from soil to blended soil. MDD decreased with a percentage of 8.43% from soil to that of blended mixture. CBR increased by a steeping 92.83% from soil to blended soil i.e., from 1.59 to 22.19. The trend stayed the same for both lime and fly ash in the determination of the above properties. The results show that both lime and fly ash are suitable for enhancing the properties of soils that are clayey in nature.