Developing and Testing of Strain-Hardening Cement-Based Composites (SHCC) in the Context of 3D-Printing

Ogura, Hiroki; Nerella, Venkatesh Naidu

doi:10.3390/ma11081375

Cited by 159 publications

(81 citation statements)

References 35 publications

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“…It has allowed the production of a physically-based background in order to formulate concrete with the required fresh properties, and allowed us to evaluate a time window during which it is possible to deposit a new layer of cement-based material. Nowadays, some technical solutions have emerged in the development of successful concrete printing, and researchers have started to work on the structural performances of reinforced and unreinforced concrete printed structures [9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…It can be observed that at the present time, the placing of the steel bars is not automated, even if some projects tend to use a simultaneous printing of concrete and steel [23]. Using fibers is also a common method to reinforce printed concrete structures [12,13,[24][25][26][27][28]. For example, steel [24], bio-based fibres [16,26], polymeric fibres [12,24], basalt fibres [28] or glass fibers [14] have already been tested to enhance the tensile behavior and the ductility of 3D printed cementitious materials.…”

Section: Introductionmentioning

confidence: 99%

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Nailing of Layers: A Promising Way to Reinforce Concrete 3D Printing Structures

et al. 2020

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Today, the extrusion-based 3D printing of concrete is a potential breakthrough technology for the construction industry. It is expected that 3D printing will reduce the cost of construction of civil engineering structures (removal of formwork) and lead to a significant reduction in time and improve working environment conditions. Following the use of this additive manufacturing layer-wise process, it is required to change the way concrete structures are designed and reinforced, especially for the parts of the structure under tension loads. Indeed, the extrusion-based concrete 3D printing process does not allow for the production of conventional reinforced concrete, and there is a need to develop other ways of compensating for the low mechanical performances of concrete, particularly in tension. In this study, the reinforcement of printed structures by using steel nails through the deposited layers of fresh concrete was investigated. Additionally, three-layer and 10-layer samples were reinforced with nails with varying inclination and spacing. The results show that inclined nails can be used to provide a flexural strengthening of the printing material in different directions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nailing of Layers: A Promising Way to Reinforce Concrete 3D Printing Structures

et al. 2020

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“…The printing nozzle size of 15 mmwhich is only slightly larger than the length of steel fiber (13 mm)aligns the fibers in the plane of the layer. The alignment of short fibers in the printing direction due to the extrusion process has been reported in the literature for 3D printed fiber-reinforced geopolymer composites [13,31] and strainhardening cementitious composites [32,33]. On the other hand, the mold-cast specimens show a more random orientation of fibers in all the three dimensions [34].…”

Section: Hardened Propertiesmentioning

confidence: 58%

Development of a 3D-Printable Ultra-High Performance Fiber-Reinforced Concrete for Digital Construction

Arunothayan¹,

Nematollahi²,

Ranade³

et al. 2019

Preprint

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This paper presents the systematic development and performance characterization of a nonproprietary 3D-printable ultra-high-performance fiber-reinforced concrete (UHPFRC) for digital construction. Several fresh and hardened properties of the developed 3D-printable UHPFRC matrix (without fiber) and composite (with 2% volume fraction of steel fibers) were evaluated and compared to that of conventionally mold-cast UHPFRC. Additionally, the effects of testing direction on the compressive and flexural strengths of the printed UHPFRC were investigated.The fresh properties of the UHPFRC developed in this study satisfied the criteria for extrudability, buildability, and shape-retention-ability, which are relevant for ensuring printability. The printed UHPFRC exhibited superior flexural performance to the mold-cast UHPFRC due to alignment of the short fibers in the printing direction. The high compressive and flexural strengths, along with the deflection-hardening behavior, of the developed UHPFRC can enable the production of thin 3D-printed components with significant reduction or complete elimination of conventional steel bars.

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“…In addition to those two general routes, polymer-reinforced concretes have also been directly extruded using cementitious mix composed of high-density polyethylene fibers. Ogura et al applied an extrusion-based 3D printing to create a sevenlayered, cement-based composite wall containing high density polyethylene microfibers and the mechanical evaluation on tensile and compressive strength was performed after 28 days of curing (Ogura et al, 2018). The evaluation confirmed that larger strain capacity was attained for the cementitious-HDPE composite under tensile loading with the formation of multiple cracks.…”

Section: D-printed Reinforcement Materials With Biomimetic Featuresmentioning

confidence: 99%

Bioinspired Cementitious Materials: Main Strategies, Progress, and Applications

Shahsavari

Hwang

2020

Front. Mater.

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Nature-inspired ensemble of organic and inorganic constituents, such as that found in the microstructure of nacre and dactyl clubs of Mantis shrimp, has evolved into the model system for the structural design of industrial composites. This novel design concept, which helps attaining the balance between strength, toughness and ductility, has not only induced a paradigm shift in the synthesis of advanced materials such as graphene-based composites but also, in the development of more abundant, low-cost materials such as cement and concretes. The advance in synthetic techniques and the advent of new manufacturing technologies such as 3D printing has enabled effective integration of cementitious materials with soft materials across various length scales. Furthermore, novel functional properties such as self-healing have also been materialized based on a variety of strategies. This review will provide the comprehensive overview on the ongoing research efforts, encompassing 3D printing, self-healing strategies and integration of C-S-H with organic components, all of which are actively exploited in synthesizing bioinspired, multifunctional cementitious materials.

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Developing and Testing of Strain-Hardening Cement-Based Composites (SHCC) in the Context of 3D-Printing

Cited by 159 publications

References 35 publications

Nailing of Layers: A Promising Way to Reinforce Concrete 3D Printing Structures

Nailing of Layers: A Promising Way to Reinforce Concrete 3D Printing Structures

Development of a 3D-Printable Ultra-High Performance Fiber-Reinforced Concrete for Digital Construction

Bioinspired Cementitious Materials: Main Strategies, Progress, and Applications

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