Rheological model for self-consolidating concrete

This paper presents the development of a rheological model for self-consolidating concrete (SCC). The developed model is based on the paste rheology criteria, which include minimum apparent viscosity, minimum flow, and optimum flow-viscosity ratio to achieve self-consolidating concrete with satisfactory segregation resistance and deformability. The rheology criteria of the cement paste matrix are related to the average aggregate diameter and aggregate spacing, which are influenced by physical properties and content of aggregates. The properties of SCC were characterized by quantitative measures of segregation and flow. The proposed model was developed by testing more than 70 concrete mixtures. The results showed that the paste rheology model is useful in designing SCC mixtures and reducing the extent of laboratory work, testing time, and materials used. The model can also provide a basis for development and utilization of new mineral and chemical admixtures for SCC.