3D Printed concrete with coarse aggregates: Built-in-Stirrup permanent concrete formwork for reinforced columns

被引:19
|
作者
Chen, Yidong [1 ]
Zhang, Wenhua [2 ]
Zhang, Yunsheng [1 ,3 ]
Zhang, Yu [3 ]
Liu, Cheng [1 ]
Wang, Dafu [1 ]
Liu, Zhiyong [1 ]
Liu, Guojian [4 ]
Pang, Bo [5 ]
Yang, Lin [6 ]
机构
[1] Southeast Univ, Sch Mat Sci & Engn, Nanjing 211189, Peoples R China
[2] Nanjing Forestry Univ, Coll Civil Engn, Nanjing 210037, Peoples R China
[3] Lanzhou Univ Technol, Sch Civil Engn, Lanzhou 730050, Peoples R China
[4] Suzhou Univ Sci & Technol, Sch Civil Engn, Suzhou 215011, Peoples R China
[5] Qingdao Univ Technol, Dept Civil Engn, Qingdao 266033, Peoples R China
[6] Zhengzhou Univ, Yellow River Lab, Zhengzhou 450001, Peoples R China
来源
JOURNAL OF BUILDING ENGINEERING | 2023年 / 70卷
关键词
3D Concrete printing; Coarse aggregates; Column; Stirrup; Compression; CONSTRUCTION; PERFORMANCE; CHALLENGES; COMPOSITE; STRENGTH; DESIGN;
D O I
10.1016/j.jobe.2023.106362
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
This paper investigates the axial compression performance of reinforced columns with 3Dprinted permanent concrete (with coarse aggregate) formwork. A novel square stirrup with reserved longitudinal reinforcement holes and its built-in-stirrup permanent concrete formwork method (BSPCF) were presented. Reinforced columns using BSPCF, only 3D printed permanent concrete formwork (3DPCPF), and conventional cast were manufactured and tested by axial compression experiments. Digital image correlation (DIC) was used to obtain the full-field strain evolution of concrete columns during loading and the results were confirmed by comparison with traditional measurement methods. Results indicated that the column with only 3DPCPF faced concrete formwork early spalling and severe bearing capacity reduction problems. Using BSPCF could adequately avoid the above problems and enhance the column bearing capacity close to that of conventional cast concrete columns. The DIC measurement accurately detected the interlayer fracture of the 3DPCPF under axial compression, which might be responsible for the sudden main crack development. Subsequently, a calculation method suitable for evaluating the effective part of the thicker concrete cover was proposed and discussed. The sudden decrease in aggregate content and increase of voids in the interface region between the confined core concrete and the 3D-printed concrete formwork of columns were found by X-ray computed tomography (X-CT). This phenomenon further proved the importance of BSPCF in lateral stress transfer passing over the interface region.
引用
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页数:20
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