Abstract
The weak interlayer of 3D printing cementitious materials (3DPC) remains a critical challenge for 3D printing technology, which can print fresh materials layer by layer based on a pre-defined computer model. In this paper, the effects of the printing time interval on rheological behavior, shear bond strength, penetration resistance to chloride and CO 2 of 3DPC interlayers were investigated, and the correlations among them were analyzed based on the gray relational analysis(GRA) method, a statistical method for measuring correlations between factors by their trends. The results showed that the carbonation resistance is the most sensitive to the printing time interval, followed by chloride penetration and shear bond strength. The rheological behaviors of 3DPC had weaker correlation with the shear bond strength when comparing with the interlayer surface moisture. Additionally, the porosity was more related to the shear bond strength than the number of pores. Furthermore, a quantitative relationship between shear bond strength and printing time interval was established.
Published Version
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