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3D-printable engineered cementitious composites (3DP-ECC): Fresh and hardened properties

Kequan YuTongji University, College of Civil Engineering, Shanghai, 200092, ChinaWes McGeeUniversity of Michigan, Ann Arbor, MI 48109, USATsz Yan NgUniversity of Michigan, Ann Arbor, MI 48109, USAHe ZhuUniversity of Michigan, Ann Arbor, MI 48109, USAVictor C. LiUniversity of Michigan, Ann Arbor, MI 48109, USA

2021en

ABI

Annotatsiya

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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Identifikatorlar

DOI: 10.1016/j.cemconres.2021.106388

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