ABSTRACT
ABSTRACT The fluidity of printable concrete plays an important role in 3D printing process. Previous studies show that the fluidity of fresh concrete would change during pumping process. It is also necessary to explore the change of fluidity of printable concrete. In this paper, rheological parameters are chosen to be a measure of fluidity, including static yield stress, dynamic yield stress and plastic viscosity. The effect of different pumping distance and shear time of rheometer on the rheological properties has been investigated. The results show that dynamic yield stress is basically zero in each case, indicating that tested printable concrete could be described by Newtonian model. Both static yield stress and plastic viscosity drop dramatically after transported through screw pump. With the increase of pumping distance, both static yield stress and plastic viscosity increase first and then decrease. With the increase of the shear time, plastic viscosity drops obviously.
