In previous research, Prof. G. De Schutter intensely focused on rheology of cementitious materials and its application on different systems. This focus grew from earlier pioneering research on self-compacting concrete (SCC), and resulted in groundbreaking concepts providing active rheology control. In the coming years, this research axis will be further developed with focus on materials aspects linked to the integration of active rheology control and 3D printing of concrete. The following aspects will be included: 1) Micro-vibration of magnetizable mineral particles in pulsating or alternating electromagnetic field; 2) Active control of formation of lubrication layer while pumping cementitious materials; 3)On-demand stiffening of 3D-printed cementitious material by electromagnetic control; and 4) Effect of physical fields (electromagnetic signals) on hydration of cementititous materials.