Studying Steel Fiber Reinforcement for 3D Printed Elements and Structures

Ahmed, Hassan; Giwa, Ilerioluwa; Game, Daniel; Hébert, Marc; Noorvand, Hassan; Arce, Gabriel; Hassan, Marwa; Kazemian, Ali

doi:10.1061/9780784484609.032

Cited by 2 publications

(4 citation statements)

References 10 publications

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“…It should be mentioned that the addition of steel fibers at a high dosage affects the rheological properties of the mixture and significantly increases its viscosity, resulting in reduced extrudability or nozzle blockage issues. Increasing the superplasticizer dosage increases the flowability of the cementitious matrix of the fiber-reinforced materials necessary to ensure continuous extrudability, which in turn increases the plastic deformations [29,30]. In summary, the observations from this study confirmed the positive impact of the use of a wider nozzle with a higher aspect ratio on the extrudability (preventing nozzle blockage) and shape stability of steel fiber-reinforced 3D-printed concrete.…”

Section: Fresh Propertiessupporting

confidence: 70%

“…In a recent study by the authors, mixtures with 2.5% vol. steel fibers were 3D printed using a 40 mm × 20 mm specialty nozzle without printability issues and revealed a flexural strength of 129% compared to the control [29,30]. This was the highest steel fiber dosage that has been incorporated into printing mixtures, surpassing the previous maximum of 2.1% based on the existing literature [27].…”

Section: Introductionmentioning

confidence: 85%

“…Since the actual object dimension influences the selection of the optimal nozzle size used for the printing process, this study additionally evaluates how nozzle dimensions affect the shape stability of the printed layers. As such, the shape stability results from this study were compared to the results from the authors' earlier study where a smaller nozzle dimension (40 mm (W) × 20 mm (H)) was employed (with similar test configurations and at a printing speed of 50 mm/s) [29,30]. In all cases, a variable flow rate (80 to 160 RPM) was adopted to ensure desirable layer dimensions and consistent material flow given changes in material rheology over time.…”

Section: Printable Fresh Propertiesmentioning

confidence: 99%

“…The printability and shape stability of the two selected mixtures were previously studied by the authors using a 40 mm × 20 mm nozzle [29,30]. In this study, the shape stability of the deposited layers was assessed using a wider 100 mm × 25 mm nozzle, which was designed and used for the fabrication of standard 3D-printed beams.…”

Section: Fresh Propertiesmentioning

confidence: 99%

See 3 more Smart Citations

Automated Reinforcement during Large-Scale Additive Manufacturing: Structural Assessment of a Dual Approach

Ahmed,

Giwa,

Game

et al. 2024

Buildings

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Automated and seamless integration of reinforcement is one of the main unresolved challenges in large-scale additive construction. This study leverages a dual-reinforcement solution consisting of high-dosage steel fiber (up to 2.5% by volume) and short vertical reinforcements as a complementary reinforcement technique for 3D-printed elements. The mechanical performance of the printing material was characterized by measuring the compressive, flexural, and uniaxial tensile strengths of mold-cast specimens. Furthermore, the flexural performance of the plain and fiber-reinforced 3D-printed beams was evaluated in the three main loading directions (X, Y, and Z-directions in-plane). In addition, short vertical threaded reinforcements were inserted into the fiber-reinforced 3D-printed beams tested in the Z-direction. The experimental results revealed the superior flexural performance of the fiber-reinforced beams loaded in the longitudinal directions (X and Y). Moreover, the threaded reinforcement significantly increases the flexural strength and ductility of beams loaded along the interface, compared to the control. Overall, the proposed dual-reinforcement approach, which exhibited notably less porosity compared to the mold-cast counterpart, holds great potential as a reinforcement solution for 3D-printed structures without the need for manual operations.

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Section: Fresh Propertiessupporting

confidence: 70%

Section: Introductionmentioning

confidence: 85%

Section: Printable Fresh Propertiesmentioning

confidence: 99%

Section: Fresh Propertiesmentioning

confidence: 99%

See 2 more Smart Citations

Automated Reinforcement during Large-Scale Additive Manufacturing: Structural Assessment of a Dual Approach

Ahmed,

Giwa,

Game

et al. 2024

Buildings

Self Cite

View full text Add to dashboard Cite

show abstract

A Compressive Load Bearing Analysis of 3D-Printed Circular Elements

Giwa,

Kazemian,

Gopu

et al. 2024

Buildings

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Large-scale construction 3D printing is a promising platform technology that can be leveraged to fabricate structural elements such as columns, piers, pipes, and culverts. In this study, the axial compression and split tensile performance of 3D-printed steel-fiber-reinforced circular elements fabricated with different configurations (hollow, hybrid, mold-cast, and fully 3D-printed) is evaluated. This study further investigates the performance of multi-material circular hybrid elements (3D-printed shells with different backfilled core materials) in an attempt to assess their suitability as a new construction paradigm. The experimental results revealed that the fully 3D-printed steel-fiber-reinforced circular elements exhibited a higher load capacity (up to 36%) and a distinct crack pattern compared to the other configurations. The void ratio of circular elements has varying effects on its axial load capacity depending on the printing material and significantly influences its splitting tensile load capacity. Furthermore, the compatibility between the 3D-printed shell and the cast-in-place core is identified as an influential factor in the structural performance of the hybrid elements. The results suggest a promising construction approach where low-cement material can be utilized as infill material for a cost-effective 3D-printed permanent formwork, offering a viable solution for specific infrastructure development applications.

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Studying Steel Fiber Reinforcement for 3D Printed Elements and Structures

Cited by 2 publications

References 10 publications

Automated Reinforcement during Large-Scale Additive Manufacturing: Structural Assessment of a Dual Approach

Automated Reinforcement during Large-Scale Additive Manufacturing: Structural Assessment of a Dual Approach

A Compressive Load Bearing Analysis of 3D-Printed Circular Elements

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