INFLUENCE OF FLY ASH IN STRENGTH CHARACTERISTICS OF COHESIVE SOILS

In this work, the influence of fly ash on the behaviour of Expansive soil were studied with varying percentage as 10%,20%,30%,40%,50% and compared with the control sample. For the study, soil sample is collected from the southern coimbatore and the admixture is fly ash categorized under class F. The clay fraction and consistency limit test results show that the sample is Highly Compressible Clay. The free swell value for control sample is 52% and reduced to 45% for 30% fly ash admixture. The standard proctor test result shows that addition of flyash to the soil improves the maximum dry density from 1.45 g/cc to 1.64g/cc and optimum moisture content decreases from 23% to 19.5%. The unconfined compressive strength results of various percentages of fly ash increases from 4.32 kg/cm2 to 6.115 kg/cm2 when compared with the control sample.