A conceptual model for numerical simulation of Active Rheology Control validated for cementitious pumping

Although concrete is the most used construction material, its processes passively rely on rheology. Active Rheology Control (ARC) was introduced to overcome contradicting requirements by (reversibly) altering rheology via external stimuli. Since little is known about modelling ARC behaviour, a conceptual model was proposed as actively controllable extension of passive thixotropy; based on the kinetic evolution of an internal structure or control state λ, driven by structural build–up and break–down. Validation was conducted by experiments and numerical simulations in the context of cementitious magneto–rheological pumping. Three alternative hypotheses for the ARC response were falsified. Numerical simulations valorised the model, which can conceptualise ARC both qualitatively and quantitatively. Future results should further confirm the accepted combined hypothesis of predominant magneto-structuration with subordinate magnetic flow confinement. Although the proposed model may serve as a foundation for future research, the scope of cementitious ARC is wider in terms of materials and external stimuli. [Display omitted] •A constitutive Active Rheology Control (ARC) model and quantification methodology was proposed.•ARC was successfully enabled exploiting a magnetic fly ash and an activating magnetic pipe section.•A numerical framework was developed to model ARC and an external magnetic trigger field.•The constitutive cementitious ARC behaviour was validated against alternative hypotheses.