STUDY ON THE EFFECT OF CHANGE OF COMPACTION ENERGY ON SHEAR STRENGTH OF FLY ASH

Shear strength of a material is a measure of the material's ability to withstand imposed stresses on the material. Unconfined compression test and other shear strength tests give some important parameters in geotechnical and pavement engineering studies. In order to determine the different engineering properties of various flyash samples obtained from various sources and being widely used in highway engineering now-a-days, triaxial and direct shear tests are performed. The stress strain curve, peak strength, permanent strength, elastic modulus and shearing strength of solidified flyash under different design overburden pressure and cell pressure are measured through triaxial shear test. By direct shear test the cohesion and angle of shearing resistance of flyash samples are measured at different water contents and degree of compaction. This paper investigates the effect of mode of compaction energy applied during compaction, degree of compaction, moisture content at optimum and +2% and -2% from optimum on the shear strength properties of flyash. Direct shear test by using conventional apparatus and consolidated drained triaxial test for unstabilized and unconfined compression test for lime and cement stabilized flyash are investigated. Lime or cement has been added as secondary constituents to further enhance self hardening of the blended mix. Stress strain behavior of unconfined compression test for stabilized flyash shows the failure stress and strain for increasing additive content and duration of curing. Unconfined compression test is an important test for determination of optimum binder content for stabilized flyashes.