Rheological properties of cement and concrete refer to the behavior of these materials under flow conditions, primarily characterized by their viscosity and plasticity. The rheology of concrete is crucial as it determines the ease with which it can be mixed, transported, placed, and compacted without segregation or excessive bleeding. These properties are influenced by the composition of the mix, including the type and amount of cement, water-to-cement ratio, and the presence of additives such as superplasticizers. The primary mechanisms influencing concrete’s rheology include the hydration reaction of cement, the interaction between cement particles and water, and the adsorption of additives on cement particles, which modify the flow characteristics.