Abstract
Rheology is a subject that studies the flow and deformation of objects caused by various reasons. For fresh cement concrete, to study its flow law, it is necessary to study the quantitative relationship between stress and deformation at a certain moment, and its relationship is usually expressed by rheological equation. Its rheological parameters mainly include yield stress, plastic viscosity and thixotropy. In physical sense, the relationship between yield stress, plastic viscosity and rheological properties of fresh cement concrete is the relationship between shear rate and shear stress when slurry flows, and thixotropy is always closely related to time. This chapter summarizes rheology and its application in the field of concrete, introduces the existing testing methods and principles of concrete rheology, explains in detail the empirical and workability parameters such as slump and slump flow, as well as the flow parameters such as dynamic yield stress, plastic viscosity, and static yield stress, and analyzes the relationship between rheological parameters and empirical and workability parameters.
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