Search Results - "Kruger, Jacques"

Evaluating the effects of porosity on the mechanical properties of extrusion-based 3D printed concrete by van den Heever, Marchant, du Plessis, Anton, Kruger, Jacques, van Zijl, Gideon

“…Elements fabricated by extrusion-based 3D concrete printing (3DCP) display anisotropic mechanical properties when subject to loading conditions orientated in…”
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Investigating the Poisson Ratio of 3D Printed Concrete by Kruger, Jacques, van der Westhuizen, Jean-Pierré

“…Poisson’s ratio, defining the lateral to longitudinal strain of a material under uniaxial load, is an extensively used material property in engineering…”
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On the emergence of 3D printable Engineered, Strain Hardening Cementitious Composites (ECC/SHCC) by Li, Victor C., Bos, Freek P., Yu, Kequan, McGee, Wes, Ng, Tsz Yan, Figueiredo, Stefan Chaves, Nefs, Karsten, Mechtcherine, Viktor, Nerella, Venkatesh Naidu, Pan, Jinlong, van Zijl, Gideon P.A.G., Kruger, P. Jacques

“…While interest in 3D printing of concrete (3DCP) and structures has been growing, a major obstacle for implementation of 3DP construction method is the need…”
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An ab initio approach for thixotropy characterisation of (nanoparticle-infused) 3D printable concrete by Kruger, Jacques, Zeranka, Stephan, van Zijl, Gideon

“…•Rthix, the re-flocculation rate, is up to one order of magnitude larger than Athix.•Addition of an optimum quantity nano-silica increases thixotropy.•Optimum…”
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Plastic shrinkage cracking in 3D printed concrete by Moelich, Gerrit M., Kruger, Jacques, Combrinck, Riaan

“…In concrete, early age pore water evaporation results in volumetric shrinkage that, if restrained, can cause plastic shrinkage cracking (PSC). 3D printed…”
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Modelling the interlayer bond strength of 3D printed concrete with surface moisture by Moelich, Gerrit Marius, Kruger, Jacques, Combrinck, Riaan

“…Providing additional water to the hydrating cementitious particles is essential to achieve the optimal mechanical performance of the low w/b concrete mixes…”
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A compendious review on lack-of-fusion in digital concrete fabrication by Kruger, Jacques, van Zijl, Gideon

“…Lack-of-fusion (LOF) in digital concrete fabrication is one of the paramount technical issues that must be elucidated before mass industry implementation of…”
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3D concrete printing: A lower bound analytical model for buildability performance quantification by Kruger, Jacques, Zeranka, Stephan, van Zijl, Gideon

“…Concrete structures are 3D printed in the plastic state, therefore emphasis should be placed on the rheological characterisation of these materials to ensure…”
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A rheology-based quasi-static shape retention model for digitally fabricated concrete by Kruger, Jacques, Zeranka, Stephan, van Zijl, Gideon

“…•An analytical filament shape retention model is derived and proposed for digital concrete fabrication.•Only rheology material properties are required as input…”
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An investigation into the porosity of extrusion-based 3D printed concrete by Kruger, Jacques, du Plessis, Anton, van Zijl, Gideon

“…Concrete structures additively manufactured by extrusion-based 3D concrete printing are reportedly orthotropic in mechanical behavior and exhibit relative…”
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Rheology and application of buoyant foam concrete for digital fabrication by Cho, Seung, Kruger, Jacques, van Rooyen, Algurnon, van Zijl, Gideon

“…In the fresh state, conventional lightweight foam concrete (LWFC) has low yield stress which challenges shape retention and buildability in digital…”
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3D concrete printer parameter optimisation for high rate digital construction avoiding plastic collapse by Kruger, Jacques, Cho, Seung, Zeranka, Stephan, Viljoen, Celeste, van Zijl, Gideon

“…This research presents the development and application of a constructability design model, which determines the print speed and filament layer height…”
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Off-site construction with 3D concrete printing by Ter Haar, Bjorn, Kruger, Jacques, van Zijl, Gideon

“…The path to implementing successful, productive, and sustainable off-site 3D concrete printing building systems is unclear. To provide clarity, this paper aims…”
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An experimental study of the behavior of 3D printed concrete at elevated temperatures by Cicione, Antonio, Kruger, Jacques, Walls, Richard S., Van Zijl, Gideon

“…3D printing of concrete (3DPC) is an automated layer-wise construction technique that does not require temporary support, such as formwork, during the…”
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Improving interlayer bond in 3D printed concrete through induced thermo-hydrokinetics by Munemo, Rue, Kruger, Jacques, van Zijl, Gideon P.A.G.

“…•A novel method to improve the interlayer adhesion is proposed.•The interlayer bond strength was improved by 78 % for the control.•The method improved…”
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A mechanistic evaluation relating microstructural morphology to a modified Mohr-Griffith compression-shear constitutive model for 3D printed concrete by van den Heever, Marchant, du Plessis, Anton, Bester, Frederick, Kruger, Jacques, van Zijl, Gideon

“…•The constant compression-shear performance of 3DCP specimens is evaluated.•3DCP elements display non-linear anisotropic behaviour over the entire experimental…”
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Mechanical characterisation for numerical simulation of extrusion-based 3D concrete printing by van den Heever, Marchant, Bester, Frederick, Kruger, Jacques, van Zijl, Gideon

“…Extrusion-based 3DCP is experiencing exponential advancement in process, control, material, and fresh-state analysis technologies, strategically poising 3DCP…”
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The challenges of maintaining non-COVID medicine services at Groote Schuur Hospital, Cape Town, South Africa, during COVID-19 by Sonderup, M, Spearman, W, Ross, I, Gogela, N, Combrinck, M, Setshedi, M, Symons, G, Wearne, N, Hoosain, S, Kruger, J-J, Mbena, B, Boayke, D, Muchenje, T, Masikati, M, Okeyo, E, Makhura, B, Botha, J, Hlongwane, L, Ntusi, N

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Rivet reinforcement for concrete printing by Bester, Frederick, Kruger, Jacques, Zijl, Gideon van

“…This study demonstrates and experimentally evaluates a novel reinforcement strategy capable of rapidly bridging the interlayer interface in printed concrete…”
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Reinforcing digitally fabricated concrete: A systems approach review by Bester, Frederick, van den Heever, Marchant, Kruger, Jacques, van Zijl, Gideon

“…The structural integrity of contemporary structures is dependent on the interaction between a brittle concrete matrix and ductile reinforcement. Therefore,…”
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