不同交叠路径3D打印钢纤维增强水泥基材料的抗压性能
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作者:
作者单位:

1.北京建筑大学,工程结构与新材料北京市高等学校工程研究中心,北京 100044;2.北京建筑大学,北京未来城市设计高精尖创新中心,北京 100044

作者简介:

廖维张(1978- ),男,博士,教授,主要从事工程结构安全与防护、高性能复合材料研究,E-mail:liaoweizhang@bucea.edu.cn。
LIAO Weizhang (1978- ), PhD, professor, main research interests: engineering structural safety and protection, high-performance composite reinforcement material, E-mail: liaoweizhang@bucea.edu.cn.

通讯作者:

袁婉莹(通信作者),女,博士,E-mail:yuanwanying@bucea.edu.cn。

中图分类号:

TU528.585

基金项目:

国家自然科学基金(51878028);北京市自然科学基金(8222015、8212007);国家资助博士后研究人员计划(GZC20240096)


Compressive strength of 3D printed steel fiber reinforced cementitious materials with different overlapping paths
Author:
Affiliation:

1.Beijing Higher Education Engineering Research Center for Engineering Structures and New Materials, Beijing University of Civil Engineering and Architecture, Beijing 100044, P. R. China;2.Beijing High Precision Innovation Center for Future Urban Design, Beijing University of Civil Engineering and Architecture, Beijing 100044, P. R. China

Fund Project:

National Natural Science Foundation of China (No. 51878028); Natural Science Foundation of Beijing (Nos. 8222015, 8212007); National Program for Funding Postdoctoral Researchers (No. GZC20240096)

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    摘要:

    3D打印混凝土具有灵活、低碳、快速、无模板施工的优势,但界面黏结问题可能导致打印层结合不紧密,影响强度。交叠打印路径可减少该缺陷并增强层间黏结,提高抗压强度。对于钢纤维增强水泥基材料,钢纤维的分布方向易受打印路径的影响,交叠路径下的3D打印钢纤维增强水泥基材料的抗压强度研究尚不充分。采用平行路径和螺旋交叠路径两种3D打印方式,通过改变荷载与路径方向的夹角和螺旋交叠角制作钢纤维增强水泥基立方体试块,探究上述参数对其抗压强度的影响规律。结果表明:在X-Y平面内,平行路径抗压强度随荷载方向与路径方向夹角的变化先增后降,但均小于现浇试件;在X-Y平面内,当纤维的分布方向与加载方向平行时,抗压强度最大(X方向),当纤维的分布方向与加载方向垂直时,抗压强度最小(Y方向);30°、90°螺旋交叠路径在XYZ方向的抗压强度明显高于平行路径;相比平行打印,螺旋交叠结构减小了力学各向异性;螺旋交叠的打印方式可作为提升构件抗压强度的有效措施。

    Abstract:

    Three-dimensional printed concrete technology has the advantages of flexible, reduced carbon emissions, expedited construction, and the capacity for formless design. However, the interface bonding problem may cause the printing layer to be not tightly bonded, affecting the strength. Overlapping print paths reduce defects and enhance interlayer bonding, increasing compressive strength. For steel fiber reinforced cement-based materials, the distribution direction of steel fiber is easily affected by the printing path, and the research on the compressive strength of 3D-printed steel fiber reinforced cement-based materials under overlapping paths is insufficient. Based on 3D-printed technology, this paper explored the compressive strength by using parallel path and spiral overlapping path printing methods and varying the angle between the load and path direction and the pitch angle to fabricate steel fiber-reinforced cementitious cubic specimens. The following conclusions were drawn: In the X-Y plane, the compressive strength of parallel paths first increased and then decreased with the change in the angle between the load direction and the path direction, but it was less than that of cast-in-place specimens; In the X-Y plane, when the distribution direction of fibers is parallel to the loading direction, the compressive strength in the X direction is the highest (X direction), and when the distribution direction of fibers is perpendicular to the loading direction, the compressive strength is the lowest (Y direction); The compressive strength in the X, Y and Z directions was significantly higher in the 30° and 90° pitch angle paths compared to parallel paths; Compared to parallel structure printing, the bouligand structure reduced mechanical anisotropy. The Bouligand structure printing method has been demonstrated to enhance the compressive strength of components.

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廖维张,黄嘉俊,阚效禹,袁婉莹.不同交叠路径3D打印钢纤维增强水泥基材料的抗压性能[J].土木与环境工程学报(中英文),2025,47(5):110-117. LIAO Weizhang, HUANG Jiajun, KAN Xiaoyu, YUAN Wanying. Compressive strength of 3D printed steel fiber reinforced cementitious materials with different overlapping paths[J]. JOURNAL OF CIVIL AND ENVIRONMENTAL ENGINEERING,2025,47(5):110-117.10.11835/j. issn.2096-6717.2025.001

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  • 收稿日期:2024-07-30
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  • 在线发布日期: 2025-11-03
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