Effect of polyacrylamide on the workability and interlayer interface properties of 3D printed cementitious materials

Journal of Materials Research and Technology

Xinguo Zheng¹  Zonglin Xie¹  Tingjie Huang¹  Qiang Yuan²  Zemin Li²  Hao Yao² 

[1] National Engineering Research Center of High-speed Railway Construction Technology, Changsha 410075, China;School of Civil Engineering, Central South University, Changsha 410075, China;

关键词: 3D printing;    3D printed cementitious materials;    Workability;    Interlayer interface properties;    Microstructure;    Anionic polyacrylamide;   

DOI  :  

来源: DOAJ

【 摘 要 】

Weak interlayer interface is a major drawback of three-dimensional (3D) printed cementitious materials technology. In this paper, the effect of anionic polyacrylamide (APAM) with different dosages on the workability, interlayer interface properties (i.e., interlayer durability, shear bond strength) and interface microstructure of 3D printed cement mortar were studied. The relationship between the workability regulated by APAM and the interlayer interface properties was analyzed. The results showed that the interlayer interface properties of printed artifacts had a good correlation with the workability of fresh cement pastes. With the increase of APAM content, the plastic viscosity and structural build-up rate of cement paste improved. Meanwhile, the interface microstructure defects increased, and the porosity became higher, hence resulting in the decline of the interlayer durability and shear bond strength. In addition, the introduction of APAM can improve the cohesiveness and layer stacking performance of 3D printed cement mortar.

【 授权许可】

Unknown