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Rheological Behavior of Grout in Context of Newtonian and non-Newtonian Fluids
Sina Kazemian Department of Civil Engineering, University Putra Malaysia, Serdang, Malaysia Arun Prasad Department of Civil Engineering, Banaras Hindu University, Varanasi, India Bujang B. K. Huat Department of Civil Engineering, University Putra Malaysia, Serdang, Malaysia
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ABSTRACT |
The objective of this review is to elucidate the rheological behavior of cement based grout. Rheology of grouts is a way of describing its properties without paying any attention to whether it is a homogenous grout or a mixture of grains in a grout. Cement grout based rheology is characterized by at least two parameters; yield stress, and plastic viscosity. The rheological models are used to describe the relationship between shear stress and shear rate. The Newtonian fluids are true fluids that tend to exhibit constant viscosity at all shear rates. A non-Newtonian fluid is a fluid for which the relationship tau/gamma-dot is not a constant. Pseudo-plasticity or shear thinning is the most common type of time-independent and non-Newtonian fluid behavior observed. It is characterized by an apparent viscosity which decreases with an increasing shear rate. Many mathematical models for fluids behavior have been proposed to model the shear-thinning characteristics. These models are based on curve fitting method that gives empirical relationships for the shear stress vs. shear rate curves. Some models are based on the statistical mechanics. The Bingham model does not give an exact description of the behavior of a cement based grout even if the geometry is defined. But, there are other models and the selection of model should be done carefully based on the requirement.
Keywords: Grout, Rheology, Viscosity, Newtonian and non-Newtonian fluids.
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