3D打印全再生粗骨料混凝土各向异性力学性能研究
作者:
作者单位:

1.同济大学 土木工程学院, 上海 200092;2.广东省公路建设有限公司,广东 广州 510623;3.广深新塘立交改造项目管理处,广东 广州 510765

作者简介:

段珍华,副教授,博士生导师,工学博士,主要从事建筑固废资源化及智能建造领域。 E-mail:zhduan@tongji.edu.cn

通讯作者:

肖建庄,教授,博士生导师,工学博士。主要从事建筑固废资源化及智能建造领域。E-mail:jzx@tongji.edu.cn

中图分类号:

TU528

基金项目:

国家自然科学基金(52178244,52078358)


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

1.College of Civil Engineering, Tongji University, Shanghai 200092, China;2.Guangdong Highway Construction Co., Ltd., Guangzhou 510623, China;3.Guangshen Xintang Interchange Reconstruction Project Management Office, Guangzhou 510765, China

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    摘要:

    选用粒径4.75~10mm的粗骨料,制备成天然粗骨料混凝土和再生粗骨料混凝土,对比分析了作为3D打印油墨的可打印性,并探讨了不同养护条件对3D打印混凝土硬化后各向异性力学性能的影响。试验结果表明,相较于天然粗骨料,全再生粗骨料有助于加速打印油墨由流动性向塑性转化;通过配合比调整,打印油墨在静置10min后仍能维持可打印性,连续打印下的可工作时间增至20min;相较于标准养护,自然养护7d的天然及再生打印试样X方向的抗压强度降低分别为19.84%及20.13%;抗压强度关系为X 轴(打印方向)> Z 轴(叠层方向)> Y轴(传动轴方向),标准养护28d天然及再生打印试样Y轴抗压强度分别为X轴的83.41%与84.27%,表现出明显的各向异性。最后,从细微观角度阐释了骨料类型及3D打印层间性能对各向异性的形成机理。

    Abstract:

    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.

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段珍华,吕振源,肖建庄,李垒,刘春.3D打印全再生粗骨料混凝土各向异性力学性能研究[J].同济大学学报(自然科学版),2024,52(3):370~377

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  • 收稿日期:2022-06-16
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  • 在线发布日期: 2024-04-10
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