(1 东南大学基本建设处， 南京 211189； 2 东南大学国家预应力工程技术研究中心， 南京 211189)

摘要: 3D 打印混凝土构件受材料层层堆叠工艺的影响，其力学性能具有各向异性。 参考 C30 普通混凝土配合比设计，设计制备了两批不同龄期的 3D 打印混凝土立方体试件和棱柱体试件进行抗压强度试验，分析三种不同加载方向下 3D 打印混凝土试件的破坏规律。 进行了棱柱体试件 X 向轴心抗压强度与立方体试件立方体抗压强度的比较，测试了打印混凝土轴心抗压强度试验时棱柱体试件的弹性模量，并与国内外学者的混凝土弹性模量理论计算值进行对比。 结果表明:14d 龄期与 28d 龄期的试件在相同方向受压时其破坏模式类似；14d 龄期试件抗压强度可达到 28d 龄期试件抗压强度的 80% ~90%；立方体试件 X 向加载下的抗压强度最高，Y 向加载下的抗压强度最低；14d 龄期混凝土弹性模量与 Dhir 的理论计算值最为接近，28d 龄期弹性模量与规范 ACI 318￣19 的理论计算值最为接近。

关键词: 3D 打印混凝土； 立方体抗压强度； 轴心抗压强度； 养护龄期； 加载方向

中图分类号:TU375. 2 文献标志码:A 文章编号:1002￣848X(2022)06￣0085￣05

Research on anisotropic compressive properties of 3D printed concrete

ZHOU Lin1， DU Caixia2， ZHANG Peng2， ZHANG Qian2， CAI Jianguo2， FENG Jian2

(1 Capital Construction Office， Southeast University， Nanjing 211189， China； 2 National Prestress EngineeringResearch Center， Southeast University， Nanjing 211189， China)

Abstract: Affected by the layer￣by￣layer stacking process of materials， the mechanical properties of 3D printed concretespecimens are anisotropic. Two groups of 3D printed cube and prismatic concrete specimens with different curing ages weredesigned and printed with reference to the mixing proportion of C30 ordinary concrete to carry out the compressive strengthtests， and the failure laws of 3D printed concrete specimens under three different loading directions were analyzed. Theaxial compressive strength of the prismatic specimen in the X￣direction was compared with the cubic compressive strength ofcube specimens. The elastic modulus of the prismatic specimens during the axial compressive strength test of the printedconcrete was also tested， which was compared with the theoretical calculation values proposed by domestic and foreignscholars. The results show that the failure modes of the specimens with 14 days age and 28 days age are similar whencompressed in the same direction. The compressive strength of the specimens with 14 days age can reach 80% ~ 90% of thecompressive strength of the specimens with 28 days age. The compressive strength of the cube specimen under X￣directionloading is the highest， and the compressive strength under Y￣direction loading is the lowest. The elastic modulus of concretewith 14 days age is the closest to the theoretical calculation value of Dhir， while the elastic modulus with 28 days age is theclosest to the theoretical calculation value of code ACI 318￣19.

Keywords:3D printed concrete； cubic compressive strength； axial compressive strength； curing age； loading direction

∗国家重点研发计划项目(2018YFC0705800)。

第一作者:周林，硕士，工程师，主要从事混凝土结构的建造与工程管理研究，Email:101012961@ seu.edu.cn。

[引用本文] 周林，杜彩霞，张鹏，等. 3D 打印混凝土的各向抗压性能研究[ J]. 建筑结构，2022，52(6):85￣89，75.ZHOU Lin， DU Caixia， ZHANG Peng， et al. Research on anisotropic compressive properties of 3D printed concrete [ J].Building Structure，2022，52(6):85￣89，75.