3D concrete printing technology can break free from template constraints and achieve automated construction of complex components, making it an important development direction for digital construction.
However, one of the core issues facing this technology is the lack of constructiveness.
The so-called constructiveness refers to the ability of concrete to continuously print to the target height during the layer by layer stacking process without significant deformation or collapse.
During the printing process, materials require lower yield strength and viscosity during the pumping and extrusion stages to ensure flow and transport; During the sedimentation and stacking stages, it is necessary to rapidly increase the yield strength to support subsequent layer loads.
Therefore, how to quickly switch between “easy pumping” and “easy forming” of concrete has become a key issue in the design of 3D printed concrete materials and equipment.
This article systematically summarizes the main technologies for improving the construction performance of 3D printed concrete around this issue.
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