ABSTRACT
The rheological parameters of the soils and soil-cement mixtures, such as storage modulus, loss modulus, viscosity, flow points, shear stress, yield stress, and many more, are being studied to examine and understand the response of the soil microstructure subjected to external stress. In this study, a stress-controlled rotational rheometer is used on several test specimens of clay soil mixed with Ordinary Portland Cement (OPC) and Ground Granulated Blast Furnace Slag (GGBFS). The soil specimens underwent shear deformations at the rate of 0.01% to 100% using a 50 mm diameter measuring shaft at various time intervals during the Amplitude Sweep Test (AST). AST was performed to investigate the viscoelastic properties of the soil paste having OPC (15% by weight of dry soil) and different proportions of GGBFS (0%, 20%, 30%, and 40% by dry weight of OPC). The obtained test results showed that, when the strain rate was low, storage modulus (G’) exceeded loss modulus (G’’) for all the samples (15%C-0%G, 15%C-20%G, 15%C-30%G, 15%C-40%G). Notably, the sample with 20% GGBFS replacement (15%C-20%G) exhibited the highest G’ value among all compositions, which indicates that the 20% GGBFS replacement sample deforms and returns to its original state more quickly than the other samples.
