An Experimental Study on Shear Modulus of Alkali Activated GGBS Stabilised Soil

Abstract

Abstract The shear modulus of the alkali activated Ground granulated blast furnace slag (GGBS) stabilized soil is evaluated in the current study by conducting triaxial tests under cyclic loading. Stabilised soil samples were prepared and studied for shear modulus by varying the loading frequency, rate of loading and confining pressure. It is found that the shear modulus degradation is more prominent at lower confining pressure. For a confining pressure of 50Kpa, and cyclic shear strain amplitude of 0.2%, shear modulus degradation varies from 12% to 15.7% for an increase in loading frequency from 0.5Hz to 1.5Hz. Whereas for a confining pressure of 200Kpa, and cyclic shear strain amplitude of 0.2%, shear modulus degradation varies from 2.4% to 6.3% for an increase in loading frequency from 0.5Hz to 1.5Hz. Lateral support decreases the rate of degradation for the same loading frequency. With increase in cyclic shear strain from 0.2% to 0.8% as given in fig, rate of degradation increases from 6.8% to 30.7% for a confining pressure of 200KPa to 50kPa.