International conference on construction engineering and project management (국제학술발표논문집)

  • 2024.07a
  • /
  • Pages.1081-1087
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  • 2024
  • /
  • 2508-9048(eISSN)
Korea Institute of Construction Engineering and Management (한국건설관리학회)
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Influence of polypropylene fibers and polyoxymethylene fibers on mechanical property and drying shrinkage of 3d printed concrete

  • Jia-Chen XUE (Department of Civil Engineering, National Central University) ;
  • Ciao-Yin LIANG (Department of Civil Engineering, National Central University) ;
  • Cheng-Xuan YU (Department of Civil Engineering, National Central University) ;
  • Chia-Yun HUANG (Department of Civil Engineering, National Central University) ;
  • Wei-Chien WANG (Department of Civil Engineering, National Central University) ;
  • Ming-Gin LEE (Department of Civil and Construction Engineering, Chaoyang University of Technology)
  • Published : 2024.07.29
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Abstract

The construction of 3D Printed Concrete (3DPC) structures, particularly in reinforced concrete, still poses challenges due to constraints in construction methods. Additionally, the unique mixture design of 3DPC typically results in noticeable drying shrinkage. Utilizing short fibers for fiber reinforcement is a reliable approach that may replace reinforcing steel and address the challenge of volume stability. In this study, polypropylene (PP) fibers and polyoxymethylene (POM) fibers were incorporated into the total volume of concrete at additional percentages of 0.5%, 1.0%, and 1.5% to printed the specimen. While ensuring printability, various experiment were conducted to evaluate compressive strength, flexural strength, anisotropy, and drying shrinkage,to ensure the impact of fiber type and content on the mechanical properties and drying shrinkage of 3DPC. The results indicate that 3DPC exhibits significant strength loss after fiber addition, with loss percentages approximately ranging from 5% to 55% for compressive strength and 9% to 57% for flexural strength. The extent of loss improves with increasing PP fiber content, while the strength of POM fibers continues to decline with increased usage. Furthermore, significant anisotropy is observed in 3DPC after fiber addition, with compressive strength relations appearing as X > Y ≈ Z in various directions, while flexural strength relations are demonstrated as Y ≈ Z > X. Concerning drying shrinkage, the addition of 1.0% POM fibers proves most effective in inhibiting drying shrinkage, reducing shrinkage by approximately 6% at the age of 56 days. In contrast, the presence of PP fibers, regardless of quantity, adversely affects drying shrinkage.

Keywords

Acknowledgement

The support of National Science and Technology Council [NSTC-112-2221-E-008-037-MY3] is gratefully acknowledged.

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