Tests and Numerical Simulation on Compressive Properties of 3D Printing Concrete along Rectangular-Ambulatory-Plane Path

Abstract

Abstract: The concrete samples of 3D printing along rectangular-ambulatory-plane (R-a-p) path were cut into three types of test cubes: R-a-p, stripe and corner. Compressive strength tests were conducted on these specimens in X, Y and Z directions, and their compressive behaviors were simulated using the finite element models based on the interface bonding. The strength inhomogeneity, anisotropy and formation mechanism of 3D printing along R-a-p path were investigated. The test results show that the highest compressive strength of the three types specimens is in the X direction (along the printed strip direction), the lowest is in the Z direction (layer-by-layer stacking direction) and the R-a-p specimens exhibit the highest average strength of three directions and the most significant strength anisotropy. Overall, there is no great difference between the average strength of three types cubes. The strength calculation results and damage characteristics from finite element models are basically consistent with the experimental results, implying that the introduction of cohesive element can better simulate the interface behavior of 3D printing concrete. The horizontal interface perpendicular to the loading direction has a great influence on the strength, and the difference in the number and distribution of these interfaces in different loading directions is the main reason for the strength anisotropy of 3D printing concrete. The research provides a reference for the printing path planning of 3D printing concrete.

Key words: 3D printing concrete, rectangular-ambulatory-plane, numerical simulation, interface bonding, cohesive element, anisotropy

CLC Number:

TU528

ZHANG Haiyan, TANG Guoming, GUO Minlong, KANG Shengguo. Tests and Numerical Simulation on Compressive Properties of 3D Printing Concrete along Rectangular-Ambulatory-Plane Path[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(6): 1980-1986.

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