3D printed concrete has high requirements for the early age rheological properties of materials.
The materials need to have sufficient fluidity during pumping and extrusion stages, as well as quickly restore structural strength after deposition to ensure stability during layer by layer stacking.
Alkali activated materials are considered an important development direction for 3D printing cement-based materials due to their advantages of low carbon, early strength, and the ability to utilize industrial by-products.
However, the rheological behavior of alkali activated materials is significantly affected by the type of precursor, especially the properties such as static yield stress, thixotropy, and viscosity recovery, which directly determine their printability and constructability.
Therefore, it is necessary to systematically study the influence of different precursors on the rheological properties of 3D printed alkali excited materials.
.