Modeling Dynamic Segregation of Self-Consolidating Concrete

Segregation is a common problem in self-consolidating concrete, which uses a high dosage of high-range water-reducing admixture to achieve high flow and passing abilities. A numerical model based on rheology and fluid dynamics was developed to calculate dynamic segregation, the separation of aggregate and paste when the concrete is flowing. The calculated dynamic segregation agreed well with values obtained in the laboratory and in the field and demonstrated the concrete properties that control dynamic segregation-paste rheology (viscosity and yield stress), aggregate properties (size, volume fraction, and density), and friction between concrete and the surface it is flowing against.