4.7 Article

Mechanical properties of 3D printed concrete in hot temperatures

期刊

CONSTRUCTION AND BUILDING MATERIALS
卷 266, 期 -, 页码 -

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2020.120991

关键词

3D concrete printing; Additive manufacturing; Bond shear strength; Flexural strength; Fibers

资金

  1. American University of Sharjah research fund
  2. Sharjah Research Technology and Innovation Park

向作者/读者索取更多资源

This study evaluated the mechanical properties of 3D printed fiber-reinforced concrete mix in different environmental conditions, revealing that high temperature accelerated water evaporation and surface dehydration, and joints in printed parts are detrimental to performance. Flexural strength increased in hot temperatures, indicating good fiber orientation during the printing process.
Concrete 3D printing is continuously studied as a new construction method. However, the use of concrete for this application is challenging in terms of workability and mechanical performance. Additionally, this technology is still lacking evaluation standards and guidelines. Furthermore, performance of printing concrete in hot temperature conditions is still generic. This study was conducted to assess the mechanical properties of a 3D printed fiber-reinforced concrete mix in two environmental conditions: ambient and hot. Compressive, flexural, and interlayer bond shear strengths were evaluated. A novel test setup was designed for bond strength evaluation at different printing time intervals. Compressive strength was evaluated to be 47 MPa in control cubes. Results from compression and bond tests indicated accelerated water evaporation and surface dehydration in hot conditions, and that the presence of joints in printed parts is detrimental to such parameters. Flexural strength was increased in hot temperatures compared to control and ambient specimens by 21% and 18% respectively. Flexural strength results demonstrated that fibers have a good orientation by the print process, and can be further improved in hot conditions due to lower material viscosities. (C) 2020 Elsevier Ltd. All rights reserved.

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