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

Clc Number:

TU528.585

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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    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

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History
  • Received:July 30,2024
  • Revised:
  • Adopted:
  • Online: November 03,2025
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