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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Van Tittelboom, Kim
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (36/36 displayed)
- 2024Early-age shrinkage assessment of cementitious materials : a critical reviewcitations
- 2024Non-destructive evaluation of ductile-porous versus brittle 3D printed vascular networks in self-healing concretecitations
- 2023Assessment of pore structure characteristics and tortuosity of 3D printed concrete using mercury intrusion porosimetry and X-ray tomographycitations
- 2023Assessment of pore structure characteristics and tortuosity of 3D printed concrete using mercury intrusion porosimetry and X-ray tomography
- 2023Production of calcium carbonate-precipitating biomass powder as self-healing additive in concrete and performance evaluation in mortarcitations
- 2023Development of a calcium sulfoaluminate-Portland cement binary system for twin-pipe 3D concrete printingcitations
- 2023Recent progress and technical challenges in using calcium sulfoaluminate (CSA) cementcitations
- 2023Bacteria-based self-healing concrete exposed to frost salt scalingcitations
- 2023Extending 3D concrete printing to hard rock tunnel linings : adhesion of fresh cementitious materials for different surface inclinationscitations
- 2023Influence of retarders on the hydration and rheology of calcium sulfo aluminate cement
- 2022Properties and testing of printed cement-based materials in hardened statecitations
- 2022Influence of 3D printed vascular networks in self-healing cementitious materials on water absorption studied via neutron imaging
- 2022Mechanical and microstructural properties of 3D printable concrete in the context of the twin-pipe pumping strategycitations
- 2022Stiffening controllable concrete modified with redispersible polymer powder for twin-pipe printingcitations
- 2022Stiffening controllable concrete modified with redispersible polymer powder for twin-pipe printingcitations
- 2022Transport properties of 3D printed cementitious materials with prolonged time gap between successive layerscitations
- 2022Transport properties of 3D printed cementitious materials with prolonged time gap between successive layerscitations
- 2022Adhesive properties of fresh cementitious materials as measured by the tack test
- 2022Using limestone powder as a carrier for the accelerator in extrusion-based 3D concrete printingcitations
- 2021An investigation of suitable healing agents for vascular-based self-healing in cementitious materialscitations
- 2021Manual application versus autonomous release of water repellent agent to prevent reinforcement corrosion in cracked concretecitations
- 20213D printing of cementitious materials with superabsorbent polymers : a durable solution?
- 2021Treatment with nano-silica and bacteria to restore the reduced bond strength between concrete and repair mortar caused by aggressive removal techniquescitations
- 2021Evaluation of test methods for self-healing concrete with macrocapsules by inter-laboratory testing
- 2021Evaluation of test methods for self-healing concrete with macrocapsules by inter-laboratory testing
- 2020Addressing the need for standardization of test methods for self-healing concrete : an inter-laboratory study on concrete with macrocapsulescitations
- 2020Effect of limestone powder substitution on fresh and hardened properties of 3D printable mortarcitations
- 2020Addressing the need for standardization of test methods for self-healing concrete: an inter-laboratory study on concrete with macrocapsules.
- 2020Addressing the need for standardization of test methods for self-healing concrete: an inter-laboratory study on concrete with macrocapsulescitations
- 2019Microstructural characterization of 3D printed cementitious materialscitations
- 2019Microstructural characterization of 3D printed cementitious materialscitations
- 2019Bond improvement between concrete substrates and repair systems by bacterial CaCO3 precipitation
- 2019Stiffening control of printable cement paste with flash setting admixture
- 2018Effect of Polyurethane Viscosity on Self-Healing Efficiency of Cementitious Materials Exposed to High Temperatures from Sun Radiationcitations
- 2018Poly(methyl methacrylate) capsules as an alternative to the ‘’proof-of-concept’’ glass capsules used in self-healing concrete
- 2016The microstructure of capsule containing self-healing materials: A micro-computed tomography studycitations
Places of action
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article
Microstructural characterization of 3D printed cementitious materials
Abstract
Three-dimensional concrete printing (3DCP) has progressed rapidly in recent years. With the aim to realize both buildings and civil works without using any molding, not only has the need for reliable mechanical properties of printed concrete grown, but also the need for more durable and environmentally friendly materials. As a consequence of super positioning cementitious layers, voids are created which can negatively affect durability. This paper presents the results of an experimental study on the relationship between 3DCP process parameters and the formed microstructure. The effect of two different process parameters (printing speed and inter-layer time) on the microstructure was established for fresh and hardened states, and the results were correlated with mechanical performance. In the case of a higher printing speed, a lower surface roughness was created due to the higher kinetic energy of the sand particles and the higher force applied. Microstructural investigations revealed that the amount of unhydrated cement particles was higher in the case of a lower inter-layer interval (i.e., 10 min). This phenomenon could be related to the higher water demand of the printed layer in order to rebuild the early Calcium-Silicate-Hydrate (CSH) bridges and the lower amount of water available for further hydration. The number of pores and the pore distribution were also more pronounced in the case of lower time intervals. Increasing the inter-layer time interval or the printing speed both lowered the mechanical performance of the printed specimens. This study emphasizes that individual process parameters will affect not only the structural behavior of the material, but they will also affect the durability and consequently the resistance against aggressive chemical substances.