Experimental Study on Potential of Flyash in Soil Stabilization

Abstract:

The present investigation explores the effectiveness of fly ash as a stabilizing agent by an analysis of its influence on soil consistency limits, compaction behavior, and strength characteristics. The study demonstrates notable reductions in the liquid limit and plasticity index of soil as the amount of fly ash replacement increases (3%, 6%, and 9%), as observed through Atterberg limit tests conducted in accordance with the IS 2720 criteria. The liquid limit exhibits a continuous decrease as the replacement of fly ash increases, with greater replacements leading to more significant declines. Likewise, the plastic limit decreases as the percentage of replacement increases, though it shows variations. It is worth noting that there exists a negative correlation between the concentration of fly ash and the plasticity of soil, with the most significant decrease recorded at a fly ash content of 9%. In addition, compaction tests done in line with IS requirements indicate significant alterations in compaction properties when fly ash is added. Increase in fly ash proportions leads to an apparent rise in the maximum dry density of soil-fly ash combinations. Furthermore, the present study investigates the strength characteristics of soil stabilization through the utilization of varying quantities of fly ash (3%, 6%, and 9%). The findings demonstrate notable improvements in both compressive and shear strength as a result of using fly ash.