Journal
CEMENT AND CONCRETE RESEARCH
Volume 143, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2021.106388
Keywords
3D printing; Self-reinforced; Engineered cementitious composite; Rheology; Mechanical properties
Funding
- Department of Civil and Environmental Engineering
- College of Engineering
- Taubman College of Architecture and Urban Planning's Prototyping Tomorrow Grant Initiative
- University of Michigan MCubed 3.0
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The research focuses on developing a printable cement composite material to replace steel reinforcement for 3D concrete printing. Results show that the interface between printed layers is strengthened by a groove-tongue joint, improving the strength of the printed structure.
3D printing (3DP) is an emerging digital construction method for concrete materials. A major impediment to efficient 3D concrete printing (3DCP) is the need for steel reinforcement, the placement of which is incompatible with the 3DP process. Unlike plain concrete, ductile self-reinforced engineered cementitious composite (ECC) holds promise to remove the dependence on steel reinforcement. The objective of this research is to develop a 3D-printable ECC (3DP-ECC). The fresh rheological and hardened mechanical properties of 3DP-ECC are investigated. The robotically printed tensile specimens demonstrated the familiar multiple microcracking and strain-hardening behavior of conventionally cast ECC. Significant orthotropy is revealed in the compressive properties. The interface between printed layers is found to be toughened by a printed groove-tongue joint. The developed 3DP-ECC was used to print a twisted column with 150 layers, reaching a height of 1.5 m. This research lays the groundwork for efficient robotically 3D-printed structures of complex shapes.
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