Evolution of Bubble Structure and Mechanical Properties of Induced Gas 3D Printing Cement Mortar
YU Jinyao
YU Cheng
ZHANG Yamei
JIA Zijian
LI Yunxuan
Abstract：By changing the bubble structure parameters of 3D printing cement mortar(3DPCM)through air entraining agent,the evolution law of bubble structure in 3DPCM was studied,and the influence of bubble structure on the microstructure and macroscopic properties of 3DPCM was revealed.The results show that due to the high viscosity of the slurry and the influence of the vibration-free process in 3DPCM,bubbles can stably exist in the high viscosity slurry and are difficult to discharge.The strength of 3DPCM is generally lower than that of the cast mortars.As the amount of the air entraining agent increases,the strength anisotropy becomes more significant,and the coefficient of variation of strength also increases accordingly.Meanwhile,the porosity of 3DPCM is higher than that of cast mortars.Affected by lateral traction and vertical compression,the bubbles mostly take on irregular elongated shapes and tend to accumulate at the printing interface,leading to slippage at the interface and accelerate the failure of the specimens.
Keywords：3D printingbubble structuremechanical propertymicrostructure
Publication Date：2025-08-30
Online Publishing Date：2025-09-05(First online date of this platform, not the publication date of the document)
Pages：9( 790-798 )