Hydration-drying interactions in a high-volume ground granulated blast-furnace slag mortar
| Autor: | Abdelkrim Trabelsi, Akli Younsi, Abdelkarim Aït-Mokhtar, Ameur El Amine Hamami, Rafik Belarbi, Rachid Cherif |
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| Přispěvatelé: | Laboratoire des Sciences de l'Ingénieur pour l'Environnement - UMR 7356 (LaSIE), Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Carbonation 0211 other engineering and technologies 020101 civil engineering 02 engineering and technology Building and Construction engineering.material Casting Portlandite 0201 civil engineering Corrosion [SPI]Engineering Sciences [physics] Volume (thermodynamics) Ground granulated blast-furnace slag 021105 building & construction engineering General Materials Science Composite material Mortar Porosity ComputingMilieux_MISCELLANEOUS Civil and Structural Engineering |
| Zdroj: | Construction and Building Materials Construction and Building Materials, Elsevier, 2021, 279, pp.122427. ⟨10.1016/j.conbuildmat.2021.122427⟩ |
| ISSN: | 0950-0618 |
| Popis: | An experimental study of interactions between hydration and early drying was carried out on a mortar with a GGBFS volume as high as the OPC volume. 1 day after casting, the mortar was subjected to 6-month unidirectional drying in natural surrounding conditions in laboratory. At the end of the exposure period, Portlandite content, water porosity and pore size distribution were found to be not uniform along the material. When approaching the exposed surface, due to the early drying, the material gradually becomes less hydrated, more porous, and less dense. This causes strong gradients of transfer properties between the exposed surface and the core of the material, which facilitates exchanges with the surrounding environment near the surface and lowers the resistance against the penetration of aggressive agents. For instance, it was shown that considering properties only within the core of the material, sheltered from drying, significantly underestimates the risk of carbonation, and thus the risk of corrosion of reinforcement in concrete. |
| Databáze: | OpenAIRE |
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