Study on Anisotropic Mechanical Properties of 3D Printed Concrete with Full Recycled Coarse Aggregate

被引：0
|
作者：
Duan Z. [1 ]
Lü Z. [1 ]
Xiao J. [1 ]
Li L. [1 ]
Liu C. [2 ,3 ]
机构：
[1] College of Civil Engineering, Tongji University, Shanghai
[2] Guangdong Highway Construction Co.，Ltd., Guangzhou
[3] Guangshen Xintang Interchange Reconstruction Project Management Office, Guangzhou
来源：
Tongji Daxue Xuebao/Journal of Tongji University | 2024年 / 52卷 / 03期
关键词：
3D printing; anisotropic; full recycled coarse aggregates; maintenance conditions; printability;
D O I：
10.11908/j.issn.0253-374x.22284
中图分类号：
学科分类号：
摘要：
Nature coarse aggregate（NCA）and recycled coarse aggregate （RCA） concrete were prepared using coarse aggregates with particle sizes ranged from 4.75mm-10 mm，and their printability as a 3D printing ink was comparatively evaluated. The effects of different curing conditions on the anisotropic mechanical properties of 3D printed concrete after hardening were also explored. The experimental results show that compared with NCA，the full replacement of RCA can accelerate the loss of workability of the printing ink. Through the scientific regulation of the mix ratio，the printable ink can still maintain printability after 10 min of resting，which can be increased to 20 min under continuous printing. Compared to standard curing，the 7d strength loss of natural and recycled specimens under natural curing is 19.84% and 20.13%， respectively. The relationship between the anisotropic compressive strengths was X-axis （print direction）> Z-axis（stacking direction）> Y-axis（drive shaft direction，vertical X-axis）. The Y-axis compressive strengths of the natural and recycled printed specimens were 83.41% and 84.27% of the X-axis，showed significant anisotropy at 28d of standard curing. Finally， the formation mechanism of anisotropy by aggregate type and 3D printing interlayer properties was elucidated from the micro viewpoint. © 2024 Science Press. All rights reserved.
引用
收藏
页码：370 / 377
页数：7
相关论文
共 12 条
  • [1] Additive manufacturing（3D printing）：A review of materials，methods，applications and challenges ［J］, Composites Part B——Engineering, 143, (2018)
  • [2] Applicability and integration of concrete additive manufacturing in construction industry：A case study［J］, Proceedings of the Institution of Mechanical Engineers Part B——Journals of Engineering Manufacture, 235, 8, (2021)
  • [3] YANG Qianrong, ZHAO Zongzhi, XIAO Jianzhuang, Et al., Effect of mineral admixtures and chemical admixtures on performance of 3D printing mortar［J］, Journal of Building Materials, 24, 2, (2021)
  • [4] Rheology and buildability of sustainable cement-based composites containing micro-crystalline cellulose for 3D-printing［J］, Journal of Cleaner Production, 239, (2019)
  • [5] Shaodan HOU, XIAO Jianzhuang, DUAN Zhenhua, Preparation of 3D printable concrete with small coarse aggregate and its printability and mechanical properties［J］, Journal of Building Materials, 7, (2021)
  • [6] XIAO Jianzhuang, BAI Meiyan, TANG Yuxiang, Et al., Application and development of 3D printed concrete technology in China［J］, Journal of Architecture and Civil Engineering, 38, 5, (2021)
  • [7] XIAO Jianzhuang, Experimental investigation on complete stress-strain curve of recycled concrete under uniaxial loading, Journal of Tongji University（Natural Science）, 35, 11, (2007)
  • [8] XIAO J Z, Effects of recycled aggregate combinations and recycled powder contents on fracture behavior of fully recycled aggregate concrete ［J］, Journal of Cleaner Production, 366, (2022)
  • [9] CHEN Y D, Extrusion-based 3D printing concrete with coarse aggregate：Printability and direction-dependent mechanical performance［J］, Construction and Building Materials, 296, (2021)
  • [10] Hardened properties of 3D printed concrete with recycled coarse aggregate［J］, Cement and Concrete Research, 159, (2022)
12