Direct ink writing of geopolymeric inks

Franchin, Giorgia; Scanferla, Paolo; Zeffiro, Luca; Elsayed, Hamada; Baliello, Andrea; Giacomello, Giovanni; Pasetto, Marco; Colombo, Paolo

doi:10.1016/j.jeurceramsoc.2017.01.030

Cited by 134 publications

(71 citation statements)

References 14 publications

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“…Besides, another possibility is working on the addition of fillers as crumb rubber, due to the fact of its advantages on toughness resistance, insulation, water absorption, and excellent machine performance (printing performances related to the quality of aggregation) [34]. Several academic and industrial research teams based their work on the development of low-environmental printable cement materials, as geopolymer mortars, for both small-scale [13,35] and large-scale applications [36]. Geopolymers are inorganic materials with chemical compositions similar to zeolites but with an amorphous structure.…”

Section: Composition Of the Printable Mixturementioning

confidence: 99%

“…Finally, an important issue associated with the production of cement material concerns CO 2 emissions. In this area, research activity is focused on decarbonization strategies for the production of cement materials, for example with the development and optimization of geopolymer-based mixtures [13,35]. Potential methods to create a more sustainable mixture is to replace the concrete contents with other materials such as fly ash or recycle the previously used concrete aggregate [58].…”

Section: Development Of New Printable Materialsmentioning

confidence: 99%

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Extrusion-Based Additive Manufacturing of Concrete Products: Revolutionizing and Remodeling the Construction Industry

2019

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Additive manufacturing is one of the main topics of the fourth industrial revolution; defined as Industry 4.0. This technology offers several advantages related to the construction and architectural sectors; such as economic; environmental; social; and engineering benefits. The usage of concrete in additive technologies allows the development of innovative applications and complexity design in the world of construction such as buildings; housing modules; bridges; and urban and domestic furniture elements. The aim of this review was to show in detail a general panoramic of extrusion-based additive processes in the construction sector; the main advantages of using additive manufacturing with the respect to traditional manufacturing; the fundamental requirements of 3D printable material (fresh and hardened properties), and state-of-the-art aesthetic and architectural projects with functional properties.

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Section: Composition Of the Printable Mixturementioning

confidence: 99%

Section: Development Of New Printable Materialsmentioning

confidence: 99%

Extrusion-Based Additive Manufacturing of Concrete Products: Revolutionizing and Remodeling the Construction Industry

2019

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“…The foaming of geopolymers, by frothing, relies on the significant increase of viscosity caused by the progressive curing of oligomers, dispersed in aqueous suspensions, in turn due to alkali activation. More precisely, alkali activated suspensions exhibit a marked pseudoplastic behavior, so that air bubbles, incorporated by intensive mechanical stirring (with the help of surfactants), at high shear rates and low viscosity, are effectively “frozen” when stirring stops, at low shear rate and high viscosity . Since this behavior does not depend on the introduction of any organic gelling additive (typically adopted for gel casting of ceramic and glass‐ceramic foams), we can define the process as “inorganic gel casting”.…”

Section: Introductionmentioning

confidence: 99%

Highly porous mullite ceramics from engineered alkali activated suspensions

Romero

Bernardo

2017

J Am Ceram Soc

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Air may be easily incorporated by vigorous mechanical stirring, with the help of surfactants, of activated geopolymer-yielding suspensions. The cellular structure is stabilized by the viscosity increase caused by curing reactions, configuring an "inorganic gel casting". The present paper is aimed at extending this approach to mullite foams, obtained by the thermal treatment of engineered alkali activated suspensions. "Green" foams were first obtained by gel casting of a suspension for Na-geopolymer enriched with reactive c-Al 2 O 3 powders. Sodium was later extracted by ionic exchange with ammonium salts. In particular, the removal of Na + ions was achieved by immersion in ammonium nitrate solution overnight, with retention of the cellular structure. Finally, the ion-exchanged foams were successfully converted into pure mullite foams by application of a firing treatment at 1300°C, for 1 hour. Preliminary results concerning the extension of the concept to mullite three-dimensional scaffolds are presented as well.

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“…Improvements in conventional processing methods and the development of innovative fabrication approaches are required because of the increasing specific demands on properties and morphology (cell size, size distribution and interconnection) for these materials, which strictly depend on the application considered 8 . Accordingly, combining a new fabrication method (3D printing) with foaming techniques can be considered an innovative approach in the production of graded porous ceramic foams [9][10][11] .…”

mentioning

confidence: 99%

Process strategy to fabricate a hierarchical porosity gradient in diatomite-based foams by 3D printing

Capasso

Liguori

Verdolotti

et al. 2020

Sci Rep

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Motivated by the hierarchical micro and nanoscale features in terms of porosity of diatomite, the production of ceramic-graded porous foams with tailored porosity, obtained by using it as raw material, has been proposed. the main challenge during the foam-production process has been the preservation of diatomite nanometric porosity and the addition of other levels of hierarchical porosity. the coupled use of two techniques of direct foaming (chemical and mechanical), combined with the use of 3D printing inverse replica method, assured the achievement of porosity of, respectively, microscopic and macroscopic dimensions. optical and scanning electron microscopies have been performed for an in-depth characterization of the final microstructure. XRD analysis has been carried out to check the influence of sacrificial templates on the matrix mineralogical composition. The porosity of the diatomite-based foams has been investigated by means of nitrogen-adsorption analysis and mercuryintrusion porosimetry. The experimental tests confirmed the presence of different porous architectures ranging over several orders of magnitudes, giving rise to complex systems, characterized by hierarchical levels of porosity. The presence of porosity of graded dimensions affects the final mechanical performances of the macroporous diatomite-based foams, while their mineralogical composition does not result to be affected by the addition of templates.

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Direct ink writing of geopolymeric inks

Cited by 134 publications

References 14 publications

Extrusion-Based Additive Manufacturing of Concrete Products: Revolutionizing and Remodeling the Construction Industry

Extrusion-Based Additive Manufacturing of Concrete Products: Revolutionizing and Remodeling the Construction Industry

Highly porous mullite ceramics from engineered alkali activated suspensions

Process strategy to fabricate a hierarchical porosity gradient in diatomite-based foams by 3D printing

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