Weak bond strength between successive layers in extrusion-based additive manufacturing : measurement and physical origin
| Autor: | Emmanuel Keita, Patrick Belin, Wenqiang Zuo, Nicolas Roussel, Hela Bessaies-Bey |
|---|---|
| Přispěvatelé: | Laboratoire Navier (NAVIER UMR 8205), École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Université Gustave Eiffel, Comportement Physico-chimique et Durabilité des Matériaux (MAST-CPDM), Université Gustave Eiffel |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Thixotropy
IMAGERIE 3D IMAGE 0211 other engineering and technologies 02 engineering and technology 3D PRINTING [SPI.MAT]Engineering Sciences [physics]/Materials CONCRETE RHEOLOGIE 021105 building & construction BETON SECHAGE General Materials Science Composite material Porosity LAYER ADHESION REPRODUCTIBILITE Bond strength Drop (liquid) COMPORTEMENT RHEOLOGIQUE Building and Construction PATE DE CIMENT 021001 nanoscience & nanotechnology COUCHE DRYING Free surface TRAITEMENT D&apos Extrusion Cementitious 0210 nano-technology Material properties |
| Zdroj: | Cement and Concrete Research Cement and Concrete Research, Elsevier, 2019, 123, 7 p. ⟨10.1016/j.cemconres.2019.105787⟩ |
| ISSN: | 0008-8846 |
| DOI: | 10.1016/j.cemconres.2019.105787⟩ |
| Popis: | Requirements on material properties for extrusion-based additive manufacturing mostly focus on the rheological behavior of the cementitious material being printed. The layer interface strength is therefore often considered to result from a proper mixing or remixing of two consecutive layers induced by the deposition process itself and therefore from the material thixotropic behavior. We show however here that, in the case of smooth interfaces, the drop in interface strength finds its origin in the water evaporation from the free surface occurring during the short time interval between two successive layers. Our results and their analysis within the framework of drying physics suggest that the water loss is localized in a dry region at the free surface leading to an incomplete cement hydration and high local porosity. We moreover compare here various experimental protocols allowing for the assessment of a drop in bond strength. |
| Databáze: | OpenAIRE |
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