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A platform for research: civil engineering, architecture and urbanism
Interlayer Effect on Fracture Behavior of 3D Printing Concrete
Concrete additive manufacturing, also known as concrete 3D printing, opens new opportunities in the construction industry and architectural design. The layer-by-layer additive manufacture process introduces printing filaments and interlayers into the concrete components. How this new manufacturing process affects the fracture behavior of 3D printed concrete components has not been well understood. In this study, we characterized the fracture behavior of 3D printing concrete at printing interlayers in comparison with printing filaments. 3D printing concrete specimens containing notches at interlayer or filament locations were loaded in a servo-controlled testing system with closed-loop control through a high-resolution digital image correlation system that measures crack opening displacement and crack extension during loading. The plane-strain fracture toughness and critical effective crack length at the interlayer and the filament were experimentally determined. The results revealed that fracture toughness at the interlayer was 20–26% lower than at the filament. This indicates that compared with filaments, the interlayers under stress are more sensitive to defects and imperfections that can cause crack propagation and fracture failure. The results are important for understanding the effect of the 3D printing manufacturing process on the mechanical behavior of concrete components, paving the way for more rational analysis and design of highly loaded structures made of 3D printed concrete.
Interlayer Effect on Fracture Behavior of 3D Printing Concrete
Concrete additive manufacturing, also known as concrete 3D printing, opens new opportunities in the construction industry and architectural design. The layer-by-layer additive manufacture process introduces printing filaments and interlayers into the concrete components. How this new manufacturing process affects the fracture behavior of 3D printed concrete components has not been well understood. In this study, we characterized the fracture behavior of 3D printing concrete at printing interlayers in comparison with printing filaments. 3D printing concrete specimens containing notches at interlayer or filament locations were loaded in a servo-controlled testing system with closed-loop control through a high-resolution digital image correlation system that measures crack opening displacement and crack extension during loading. The plane-strain fracture toughness and critical effective crack length at the interlayer and the filament were experimentally determined. The results revealed that fracture toughness at the interlayer was 20–26% lower than at the filament. This indicates that compared with filaments, the interlayers under stress are more sensitive to defects and imperfections that can cause crack propagation and fracture failure. The results are important for understanding the effect of the 3D printing manufacturing process on the mechanical behavior of concrete components, paving the way for more rational analysis and design of highly loaded structures made of 3D printed concrete.
Interlayer Effect on Fracture Behavior of 3D Printing Concrete
RILEM Bookseries
Bos, Freek P. (editor) / Lucas, Sandra S. (editor) / Wolfs, Rob J.M. (editor) / Salet, Theo A.M. (editor) / Wu, Yun-Chen (author) / Cotrell, Jason (author) / Li, Mo (author)
RILEM International Conference on Concrete and Digital Fabrication ; 2020 ; Eindhoven, The Netherlands
Second RILEM International Conference on Concrete and Digital Fabrication ; Chapter: 55 ; 537-546
RILEM Bookseries ; 28
2020-07-08
10 pages
Article/Chapter (Book)
Electronic Resource
English
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