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 CO₂ 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.

3D 打印胶凝材料 (3DPC) 的弱夹层仍然是 3D 打印技术的关键挑战，它可以基于预定义的计算机模型逐层打印新鲜材料。在本文中，印刷时间间隔对流变行为、剪切粘合强度、对氯化物和 CO _{2 的}抗渗透性的影响研究了 3DPC 夹层的数量，并基于灰色关联分析 (GRA) 方法分析了它们之间的相关性，灰色关联分析是一种通过其趋势衡量因素之间相关性的统计方法。结果表明，耐碳化对印刷时间间隔最敏感，其次是氯化物渗透和剪切粘合强度。与层间表面水分相比，3DPC的流变行为与剪切粘合强度的相关性较弱。此外，孔隙率与剪切粘合强度的相关性比与孔隙数量的相关性更大。此外，还建立了剪切粘合强度和印刷时间间隔之间的定量关系。