Ductility of 3D printed concrete reinforced with short straight steel fibers

Bos, Freek; Bosco, E.; Salet, Theo A.M.

doi:10.1080/17452759.2018.1548069

Cited by 140 publications

(55 citation statements)

References 47 publications

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“…In their work, the authors focused on the fiber/matrix interface, which is the main factor governing the mechanical behavior of the reinforced material. Bos et al [63] investigated the ductility of 3D-printed concrete reinforced with short straight steel fibers. They showed that the fibers improve the flexural strength of printed concrete bringing it to a value similar to the cast concrete.…”

Section: Methodsmentioning

confidence: 99%

A critical review of 3D printing in construction: benefits, challenges, and risks

El-Sayegh

Romdhane

Manjikian

2020

Archiv.Civ.Mech.Eng

177

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This paper provides a critical review of the related literature on 3D printing in construction. The paper discusses and evaluates the different 3D printing techniques in construction. The paper also discusses and categorizes the benefits, challenges, and risks of 3D printing in construction. The use of 3D printing technology offers several advantages over traditional methods. However, it comes with its own additional challenges and risks. The main benefits of 3D printing in construction include constructability and sustainability benefits. The challenges are categorized into seven groups. The main challenges, found through the literature, are material related. The most cited challenges are material printability, buildability, and open time. Additionally, scalability, structural integrity, and lack of codes and regulations are frequently cited as major challenges. The additional risks are categorized into seven groups: 3D printing material, 3D printing equipment, construction site, and environment, management, stakeholders, regulatory and economic, and cybersecurity risks. The paper fills a gap in the literature as it addresses a new aspect of 3D printing, which is risk. The paper also provides some insights, recommendations, and future research ideas.

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Section: Methodsmentioning

confidence: 99%

A critical review of 3D printing in construction: benefits, challenges, and risks

El-Sayegh

Romdhane

Manjikian

2020

Archiv.Civ.Mech.Eng

177

View full text Add to dashboard Cite

show abstract

“…The flexural tests were performed as 3-point bending tests according to NEN-EN 196-1, on the same bench, at a rate of 50 N/s (load-controlled). The CMOD tests were performed according to NEN-EN 14651 (NEN-EN 14651:2005EN 2005) but on scaled down specimens (Bos, Bosco, and Salet 2019) have extensively argued this is allowable. The loading rate was controlled by the crack mouth opening, at 0.05 mm/min until a CMOD of 0.1 mm is reached and at 0.2 mm/min until the end of the test (either specimen fracture or when a CMOD of 4.1 mm was reached).…”

Section: Methodsmentioning

confidence: 99%

On-demand additive manufacturing of functionally graded concrete

Ahmed

Bos

Brunschot

et al. 2020

Virtual and Physical Prototyping

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The rapid development of additive manufacturing of cementitious materials has enabled the emergence of a new design paradigm, namely functional grading of material properties by location. Target performance parameters could be material weight and insulation value or (particularly important) ductility. A generic concept to achieve this, is through the selective addition of fibres or aggregates. In 3D concrete printing (3DCP), this concept can be developed into two strategies: by adding particles (i) to the bulk mixture through a second stage mixing process at the printer head (Simultaneous Process, SP), or (ii) in between the layers of deposited cementitious filament (Repetitive Sequential Process, RSP). The present paper presents the development of specific equipment required to obtain on-demand functional grading of the printed material. Subsequently, the application of these systems in print trials is shown. The current study focussed on ductility by creating fibre-reinforced 3D printed concrete through both strategies. The mechanical performance of the obtained material has been established through compressive, flexural, and crack-mouth opening displacement tests. To underline the generic nature of the strategies, a trial with lightweight aggregates has also been performed. It was shown that particularly the SP is capable of achieving improvements in ductility and selfweight.

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“…Fibers made of different materials are available. However, steel fibers are used most frequently [12].…”

Section: Reinforcement Systems For Extrusion (State Of the Art)mentioning

confidence: 99%

Interlayer Reinforcement Combined with Fiber Reinforcement for Extruded Lightweight Mortar Elements

et al. 2020

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Lightweight mortar extrusion enables the production of monolithic exterior wall components with improved thermal insulation by installing air chambers and reduced material demand compared to conventional construction techniques. However, without reinforcement, the systems are not capable of bearing high flexural forces and, thus, the application possibilities are limited. Furthermore, the layer bonding is a weak spot in the system. We investigate a reinforcement strategy combining fibers in the mortar matrix with vertically inserted elements to compensate the layer bonding. By implementing fibers in the extruded matrix, the flexural strength can be increased almost threefold parallel to the layers. However, there is still an anisotropy between the layers as fibers are oriented during deposition and the layer bond is still mainly depending on hydration processes. This can be compensated by the vertical insertion of reinforcement elements in the freshly deposited layers. Corrugated wire fibers as well as short steel reinforcement elements were suitable to increase the flexural strength between the layers. As shown, the potential increase in flexural strength could be of a factor six compared to the reference (12 N/mm2 instead of 1.9 N/mm2). Thus, the presented methods reduce anisotropy in flexural strength due to layered production.

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Ductility of 3D printed concrete reinforced with short straight steel fibers

Cited by 140 publications

References 47 publications

A critical review of 3D printing in construction: benefits, challenges, and risks

A critical review of 3D printing in construction: benefits, challenges, and risks

On-demand additive manufacturing of functionally graded concrete

Interlayer Reinforcement Combined with Fiber Reinforcement for Extruded Lightweight Mortar Elements

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