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Experimental Study on Interfacial Shear Behavior of 3D Printed Recycled Mortar
Ziyue Wang1, Zixuan Chen1, Jianzhuang Xiao1,2
1College of Civil Engineering, Tongji University, Shanghai, China.
3D Printing and Additive Manufacturing
|October 3, 2024
Summary
This study introduces a new shear test for 3D printed concrete interfaces. Recycled sand content and printing intervals significantly impact bond strength, with surface treatments offering crucial improvements.
Area of Science:
- Materials Science
- Civil Engineering
- Additive Manufacturing
Background:
- 3D concrete printing (3CP) enables complex structures but faces challenges in interface bonding.
- Understanding interfacial shear behavior is critical for structural integrity in 3CP components.
Purpose of the Study:
- To propose a novel shear test method for evaluating 3D printed concrete interfaces.
- To investigate the influence of recycled sand, printing intervals, and surface treatments on interfacial shear strength.
Main Methods:
- Development of a new shear test rig for interlayer and interstrip interfaces.
- Experimental investigation varying recycled sand replacement ratios, printing interval times, and surface treatments.
Main Results:
- Interlayer and interstrip interface strengths were comparable under similar printing conditions.
- Increased recycled sand slightly reduced shear strength; extended printing intervals sharply decreased it.
- 3D printed recycled mortar interfaces exhibited higher time sensitivity than natural mortar interfaces.
- Surface treatments significantly improved bond strength: epoxy paste > cement paste > surface wetting > no treatment.
Conclusions:
- Printing interval time is a critical factor affecting interfacial bond strength in 3D printed concrete.
- Effective surface treatments are essential to mitigate strength loss caused by discontinuous construction in 3DCP.
- The proposed shear test method provides valuable insights into the bond behavior of 3D printed concrete interfaces.
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