A thermo-hygro computational model to determine the factors dictating cold joint formation in 3D printed concrete
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866929378410102784 |
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| author | Hlobil, Michal Michel, Luca Pundir, Mohit Kammer, David S. |
| author_facet | Hlobil, Michal Michel, Luca Pundir, Mohit Kammer, David S. |
| contents | Cold joints in extruded concrete structures form once the exposed surface of a deposited filament dries prematurely and gets sequentially covered by a layer of fresh concrete. This creates a material heterogeneity which lowers the structural durability and shortens the designed service life. Many factors concurrently affect cold joint formation, yet a suitable tool for their categorization is missing. Here, we present a computational model that simulates the drying kinetics at the exposed structural surface, accounting for cement hydration and the resulting microstructural development. The model provides a time estimate for cold joint formation as a result. It allows us to assess the drying severity for a given structure's geometry, its interaction with the environment, and ambient conditions. We evaluate the assessed factors and provide generalized recommendations for cold joint mitigation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_05238 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A thermo-hygro computational model to determine the factors dictating cold joint formation in 3D printed concrete Hlobil, Michal Michel, Luca Pundir, Mohit Kammer, David S. Soft Condensed Matter Cold joints in extruded concrete structures form once the exposed surface of a deposited filament dries prematurely and gets sequentially covered by a layer of fresh concrete. This creates a material heterogeneity which lowers the structural durability and shortens the designed service life. Many factors concurrently affect cold joint formation, yet a suitable tool for their categorization is missing. Here, we present a computational model that simulates the drying kinetics at the exposed structural surface, accounting for cement hydration and the resulting microstructural development. The model provides a time estimate for cold joint formation as a result. It allows us to assess the drying severity for a given structure's geometry, its interaction with the environment, and ambient conditions. We evaluate the assessed factors and provide generalized recommendations for cold joint mitigation. |
| title | A thermo-hygro computational model to determine the factors dictating cold joint formation in 3D printed concrete |
| topic | Soft Condensed Matter |
| url | https://arxiv.org/abs/2406.05238 |