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(1 東南大學(xué)基本建設(shè)處， 南京 211189； 2 東南大學(xué)國家預(yù)應(yīng)力工程技術(shù)研究中心， 南京 211189)
摘要: 3D 打印混凝土構(gòu)件受材料層層堆疊工藝的影響，其力學(xué)性能具有各向異性。 參考 C30 普通混凝土配合比設(shè)計，設(shè)計制備了兩批不同齡期的 3D 打印混凝土立方體試件和棱柱體試件進行抗壓強度試驗，分析三種不同加載方向下 3D 打印混凝土試件的破壞規(guī)律。 進行了棱柱體試件 X 向軸心抗壓強度與立方體試件立方體抗壓強度的比較，測試了打印混凝土軸心抗壓強度試驗時棱柱體試件的彈性模量，并與國內(nèi)外學(xué)者的混凝土彈性模量理論計算值進行對比。 結(jié)果表明:14d 齡期與 28d 齡期的試件在相同方向受壓時其破壞模式類似；14d 齡期試件抗壓強度可達到 28d 齡期試件抗壓強度的 80% ~90%；立方體試件 X 向加載下的抗壓強度最高，Y 向加載下的抗壓強度最低；14d 齡期混凝土彈性模量與 Dhir 的理論計算值最為接近，28d 齡期彈性模量與規(guī)范 ACI 318￣19 的理論計算值最為接近。
關(guān)鍵詞: 3D 打印混凝土； 立方體抗壓強度； 軸心抗壓強度； 養(yǎng)護齡期； 加載方向
中圖分類號:TU375. 2 文獻標(biāo)志碼:A 文章編號: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
∗國家重點研發(fā)計劃項目(2018YFC0705800)。
第一作者:周林，碩士，工程師，主要從事混凝土結(jié)構(gòu)的建造與工程管理研究，Email:101012961@ seu.edu.cn。
[引用本文] 周林，杜彩霞，張鵬，等. 3D 打印混凝土的各向抗壓性能研究[ J]. 建筑結(jié)構(gòu)，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.
