Development of 3D printable engineered cementitious composites with ultra-high tensile ductility for digital construction

Zhu, Bin; Pan, Jinlong; Nematollahi, Behzad; Zhou, Zhenxin; Zhang, Yang; Sanjayan, Jay

doi:10.1016/j.matdes.2019.108088

Cited by 200 publications

(92 citation statements)

References 45 publications

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“…The sodium promoter was made by mixing a sodium hydroxide solution (NaOH) combined with a sodium silicate (water glass) solution. To produce it, flakes of technical sodium hydroxide were applied to an aqueous solution of sodium silicate (R-145) for which the molar module was 2.50 and the density was about 1.45 g/cm 3 . For the process, tap water was used rather than distilled water.…”

Section: Sample Preparationmentioning

confidence: 99%

“…With respect to construction materials, additive technologies have been found to be the most viable option for widespread use in automated construction processes in the near future [1,2]. They have many advantages such as resource saving, energy efficiency and friendliness towards the environment [3,4]. However, the full exploitation of additive technology for effective application in the construction industry still requires optimisation, especially with regard to improving methods of designing new materials [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…The fibres improve ductility and limit crack propagation under tensile and flexural loading [8,13]. The important task is to replace conventional steel bars (implemented to geopolymers from traditional concrete technology) with short fibres [3]. Hitherto, only a limited amount of research has been conducted in the area of fibrereinforced 3D printable geopolymer composites, this includes:…”

Section: Introductionmentioning

confidence: 99%

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The influence of microstructure on mechanical properties of 3D printable geopolymer composites

et al. 2020

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The additive manufacturing technologies are fast-developing industrial sector and, potentially, a ground-breaking technology. They have many advantages such as the saving of resources and energy efficiency. However, the full exploitation of 3D printing technology for ceramic materials is currently limited; a lot of research is being conducted in this area. A promising solution seems to be geopolymers, but its application requires a better understanding of the behaviour this group of materials. This article analyses the influence of microstructure on mechanical properties whilst taking the production method into consideration. The paper is based on comparative analysis – the investigation is focused on the influence of material structure on the mechanical properties and fracture mechanism of these kinds of composites, including those reinforced with different kind of fibres. As a raw material for the matrix, fly ash from the Skawina coal power plant (located in: Skawina, Lesser Poland, Poland) was used. The investigation was made by SEM analysis. The results show that the microstructural analysis did not sufficiently explain the underlying reasons for the observed differences in the mechanical properties of the composites.

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Section: Sample Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The influence of microstructure on mechanical properties of 3D printable geopolymer composites

et al. 2020

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“…In particular, the brittleness of these materials results in cracking under tensile and flexural loading [1,2]. The challenge is to replace the conventional steel bars traditionally applied in construction industry, through the proper short fibres [3]. The one possibility is mineral fibres.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Basalt Fiber Reinforced Fly Ash-Based Geopolymer Composites

Korniejenko

Mucsi

Halyag

et al. 2020

KEG

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This article analyses the influence of a short basalt fibre admixture on the mechanical properties of geopolymers, especially compressive strength. This preliminary research is the first step towards the development of a composite for fire resistant applications in civil engineering. This study investigates the behaviour of a fly ash based geopolymer containing basalt fibres. Fly ash from the coal power plant ‘Skawina’ (located in: Skawina, Lesser Poland, Poland) was used as the raw material. The chemical composition of this fly ash is typical for class F. Three series of fly ash based geopolymers were cast. In the first, short basalt fibres were added as 1% by weight of fly ash, in the second short basalt fibres were added as 2% by weight of fly ash and the third functioned as a control series without any fibres. Each series of samples were tested on compressive strength after 28, 14 and 7 days, and specimen density was determined. Additionally, microstructural analysis was carried out after 28 days. The results show that the addition of basalt fibres can improve the mechanical properties of geopolymer composites. Keywords: geopolymer, basalt fibre, composites, fire resistance

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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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Development of 3D printable engineered cementitious composites with ultra-high tensile ductility for digital construction

Cited by 200 publications

References 45 publications

The influence of microstructure on mechanical properties of 3D printable geopolymer composites

The influence of microstructure on mechanical properties of 3D printable geopolymer composites

Mechanical Properties of Basalt Fiber Reinforced Fly Ash-Based Geopolymer Composites

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

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