Research progress on shrinkage properties of extruded 3D printed cement-based materials

Extruded 3D printing is currently a widely used 3D concrete printing technology, which not only accurately prints prefabricated components but also reduces the generation of construction waste. Aiming at the high shrinkage deformation and cracking issues during the solidification and hardening process of 3D printed cement-based materials. This article compares the shrinkage performance and influencing factors of traditional pouring cement-based materials, and summarizes the internal pore structure and hydration structure of cement-based materials under 3D printing conditions from the aspects of printing process, material characteristics, and curing system, and elaborates on their shrinkage characteristics. To provide reference for revealing the influence mechanism of 3D printed layered structure on the shrinkage performance evolution of cement-based materials, and to seek theoretical basis and methodological measures to compensate for or avoid volume changes in 3D printed cement-based materials.