To further facilitate the application of active rheology control such as for 3D printing, responsive cementitious materials which can sustain the magnetorheological response after the magnetic invention needs to be developed. This research investigates the effect of concentration of hard magnetic particles on sustained rheological properties of responsive cementitious materials after a short magnetic intervention (5 s). Neodymium iron boron particles were added into the cement pastes with the replacement rate of 5%, 10%, 15%, and 20% by volume of cement powder. The storage modulus of responsive pastes after intervention was determined by strain-sweep tests. A new type of responsive mixtures which can sustain the magnetoresponse was verified. The experimental results show that the sustained rheology response can be increased and improved significantly by increasing the added amount of hard magnetic particles.