Steel fiber orientational distribution and effects on 3D printed concrete with coarse aggregate

In this study, the first insight into the extrusion-based 3D printed steel fiber reinforced concrete with 5–20 mm coarse aggregate (3DPSFRC) is presented. The fresh properties and mechanical performance of 0%, 1% and 2% fiber content 3DPSFRC were investigated and compared with those of the cast. Thr...

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Bibliographic Details
Published in:Materials and structures 2022-04, Vol.55 (3), Article 100
Main Authors: Chen, Yidong, Zhang, Yunsheng, Pang, Bo, Wang, Dafu, Liu, Zhiyong, Liu, Guojian
Format: Article
Language:English
Subjects:
Anisotropy
Building construction
Building Materials
Civil Engineering
Compressive strength
Computed tomography
Engineering
Extrusion
Image segmentation
Machines
Manufacturing
Materials Science
Mechanical properties
Original Article
Processes
Reinforced concrete
Reinforcing steels
Solid Mechanics
Steel fiber reinforced concretes
Steel fibers
Tensile strength
Theoretical and Applied Mechanics
Three dimensional printing
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Summary:In this study, the first insight into the extrusion-based 3D printed steel fiber reinforced concrete with 5–20 mm coarse aggregate (3DPSFRC) is presented. The fresh properties and mechanical performance of 0%, 1% and 2% fiber content 3DPSFRC were investigated and compared with those of the cast. Through the deep-learning segmentation method, the centerlines of steel fibers in the X-ray micro-computed tomography image sequence are extracted and 3D analyzed. The orientational distribution coefficients were introduced to quantitatively indicate the degree of steel fiber inclination in the printing ( θ ) and stacking directions ( γ ) inside the 3DPSFRC. Results indicate that the flowability of 3DPSFRC was decreased due to the presence of steel fibers compared with plain concrete. The enhancement effect of steel fiber on the compressive, flexural, and axial tensile strength (up to 73.24 MPa, 8.71 MPa, and 7.58 MPa, respectively) and post-peak toughness of 3DPSFRC is remarkable. The weakening of orientational distribution coefficients and the partial divergence distribution of steel fibers are related to the presence of coarse aggregate. Further, the anisotropy of 3DPSFRC in the compressive and flexural tests is weakened owing to the changes in the fiber orientational distribution after the steel fiber content increases.
ISSN:1359-5997
1871-6873
DOI:10.1617/s11527-022-01943-7