Modified 3D printed powder to cement-based material and mechanical properties of cement scaffold used in 3D printing

Shakor, Pshtiwan; Sanjayan, Jay; Nejadi, Shami

doi:10.1016/j.conbuildmat.2017.02.037

Cited by 171 publications

(71 citation statements)

References 21 publications

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“…The printed part under the uniaxial compression load could be broke in various directions according to the direction of printing. Figure 6b, in the same saturation specimens such as (S100 C100), a shell part under a uniaxial compression load detached their parts from the core part of the specimens (Shakor et al, 2017b). Further, investigations are required to determine the reasons behind the observed results, Figure 6.…”

Section: Saturation Level = V Binder V Envpowdermentioning

confidence: 95%

“…The extrudability and buildability of the printer have been changed according to the mix design variations. Pegna, 1997;Le, 1998;Lee et al, 2007;Gibbons et al, 2010;Rael and San Fratello, 2011;Henke and Treml, 2012;Brown, 2015;Perrot et al, 2015;Shakor et al, 2017b;Dikshit et al, 2018 Selective Zein et al, 2002;Shofner et al, 2003;Lewis et al, 2006;Mueller et al, 2014;Hager et al, 2016;Jianchao et al, 2017;Nerella et al, 2017 Gosselin et al (2016) investigated the 3DP mix proportions of concrete (see Table 3). The materials consist of an ultrahigh performance mortar paste, with an added polymer resin to improve the quality interfaces between layers and accelerating agents in order to attain adequate rheology.…”

Section: Concrete MIX Designmentioning

confidence: 99%

“…In the previous studies by the author Shakor et al (2017b) and Shakor et al (2018) distribution size of the powder that has been used in an inkjet 3D printer (Z-printer150, Z-Corporation, USA) has been analyzed and identified. The data has been acquired from particle size laser analyser (Cilas 1190), Figure 5A.…”

Section: Inkjet Printingmentioning

confidence: 99%

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Review of Emerging Additive Manufacturing Technologies in 3D Printing of Cementitious Materials in the Construction Industry

Shakor

Nejadi

Paul

et al. 2019

Front. Built Environ.

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116

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Additive manufacturing is a fabrication technology that is rapidly revolutionizing the manufacturing and construction sectors. In this paper, a review of various prototyping technologies for printing cementitious materials and selected 3D printing techniques are presented in detail. Benchmark examples are provided to compare three well-known printing techniques; inkjet printing (binder jetting), selected laser sintering (SLS), and extrusion printing (extrusion based process). A comprehensive search in the literature was conducted to identify various mix designs that could be employed when printing cementitious materials. Aspects of concrete mix design are described, and some new experiments are conducted to analyse the printability of new mixes by the authors. Future research in the area of the rheology of cementitious materials and its relationship with the structural performance of finished concretes are highlighted.

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Section: Saturation Level = V Binder V Envpowdermentioning

confidence: 95%

Section: Concrete MIX Designmentioning

confidence: 99%

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Review of Emerging Additive Manufacturing Technologies in 3D Printing of Cementitious Materials in the Construction Industry

Shakor

Nejadi

Paul

et al. 2019

Front. Built Environ.

Self Cite

116

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“…The accelerator was used in dosages of 1L, 2L and 3L for 50 kg of cement, respectively, which for water/binder ratio W/B=0.5 corresponds to 4%, 8% and 12% of water volume. The consumption of materials per 1m 3 of concrete mixture is given in table 1. The samples were hardened in a chamber of normal hardening at a temperature of 20±1 °С and an air humidity not less than 90%.…”

Section: Methodsmentioning

confidence: 99%

Study of strength kinetics of sand concrete system of accelerated hardening

Sharanova

Lenkova

Kogai

2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Methods of calorimetric analysis are used to study the dynamics of the hydration processes of concretes with different accelerator contents. The efficiency of the isothermal calorimetry method is shown for study of strength kinetics of concrete mixtures of accelerated hardening, promising for additive technologies in civil engineering. IntroductionNowadays the use of additive technologies in construction industry is one of the most actual subjects of research. Growth of interest in such technologies in construction is conditioned by a number of factors: high level of production automation, improvement of production quality, acceleration of creation processes, possibility of optimization of CAD models, reduction of production wastes [1]. These factors represent a great interest for the application of additive technologies in civil engineering and use of 3D prototyping in place of the traditional methods of construction.The main problem for the use of additive technologies in construction is the materials used, since the ordinary concrete does not meet the requirements of 3D printing productivity [2]. Special composition for building printing should harden quickly enough to withstand the weight of subsequently deposited layers without deformation. Composites that harden for a long time slow down the process of erecting the building and cannot meet the requirements of 3D printing productivity [1]. There is a need to select and determine the optimal composition of accelerating additives to reduce the setting time of the concrete mixture.A large number of recent works on the control of setting time show the relevance of this subject of research. Shakor P [3] uses a printed composition based on a mixture of ordinary Portland cement (32.2%) and high aluminate cement (67.8%) with the addition of a lithium carbonate accelerator (4.5%). Lithium carbonate provides hardening acceleration, high early strength and good adhesion. Kazemian A et al [4] examine the effect of the accelerating additive based on calcium chloride on the workability of the concrete mixture for the building 3D printer. It is noted that increasing the dose of accelerator from 2% to 3% has no significant effect on the loss of workability of concrete in the first 90 minutes after the preparation of the mixture. In addition to the accelerators, retarders of setting time are also widely used to maintain the concrete mixture in the liquid state for the time necessary for the extrusion of the material. Retarders and accelerators of the setting time are added at different stages of production [5]. Sulphoaluminate cement could be used as an accelerator. In the work [6] a mixture of ordinary Portland cement (93%) with a sulphoaluminate cement additive (7%) is studied as a working

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“…Currently, there are two approaches toward enhancement of the mechanical response of additively manufactured materials: a) elimination of detrimental heterogeneities such as porosities and interfaces present in fabricated metallic, ceramic, and hydrogel materials via optimizing the printing parameters in order to achieve performance comparable to cast counterparts and; b) incorporation of multiscale, hierarchical, and bioinspired design principles over a broad range of architectures of fabricated materials, from nano to micro, in order to engineer the mechanical properties, to significantly enhance the strength and tensile performance, load‐bearing capacity, compliancy, and impact resistance, and to overcome the brittleness and flaw‐sensitivity limitations of these materials . Similar to the trends observed in other additively manufactured materials, the presence of weak interface is considered detrimental for the overall mechanical performance of additively manufactured cement‐based materials, and current research efforts focus mostly on eliminating or strengthening the AM‐induced interfaces as a mean to minimize their effect on the overall strength, bearing capacity and to improve stress transfer across the interfaces in 3D‐printed elements . Contrary to the common approach that suggests elimination of the processing‐induced interfaces in various materials, we present a novel approach that combines harnessing the properties of heterogeneous interfaces with the design of material's architecture that can promote favorable damage mechanisms, allows for achievement of flaw tolerance and unique load–displacement response, and enhances the mechanical response in brittle cement‐based materials.…”

mentioning

confidence: 99%

Additive Manufacturing and Performance of Architectured Cement‐Based Materials

et al. 2018

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There is an increasing interest in hierarchical design and additive manufacturing (AM) of cement-based materials. However, the brittle behavior of these materials and the presence of interfaces from the AM process currently present a major challenge. Contrary to the commonly adopted approach in AM of cement-based materials to eliminate the interfaces in 3D-printed hardened cement paste (hcp) elements, this work focuses on harnessing the heterogeneous interfaces by employing novel architectures (based on bioinspired Bouligand structures). These architectures are found to generate unique damage mechanisms, which allow inherently brittle hcp materials to attain flaw-tolerant properties and novel performance characteristics. It is hypothesized that combining heterogeneous interfaces with carefully designed architectures promotes such damage mechanisms as, among others, interfacial microcracking and crack twisting. This, in turn, leads to damage delocalization in brittle 3D-printed architectured hcp and therefore results in quasi-brittle behavior, enhanced fracture and damage tolerance, and unique load-displacement response, all without sacrificing strength. It is further found that in addition to delocalization of the cracks, the Bouligand architectures can also enhance work of failure and inelastic deflection of the architectured hcp elements by over 50% when compared to traditionally cast elements from the same materials.

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Modified 3D printed powder to cement-based material and mechanical properties of cement scaffold used in 3D printing

Cited by 171 publications

References 21 publications

Review of Emerging Additive Manufacturing Technologies in 3D Printing of Cementitious Materials in the Construction Industry

Review of Emerging Additive Manufacturing Technologies in 3D Printing of Cementitious Materials in the Construction Industry

Study of strength kinetics of sand concrete system of accelerated hardening

Additive Manufacturing and Performance of Architectured Cement‐Based Materials

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