Delayed Deformations of Na- and K- Sulphates Activated Blast-Furnace Slag Mortars
| Autor: | Li, Lei, Hannawi, Kinda, Darquennes, Aveline |
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| Přispěvatelé: | Laboratoire de Génie Civil et Génie Mécanique (LGCGM), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA) |
| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | International RILEM Conference on Synergising expertise towards sustainability and robustness of CBMs and concrete structures International RILEM Conference on Synergising expertise towards sustainability and robustness of CBMs and concrete structures, 44, Springer Science and Business Media B.V., pp.403-414, 2023, ⟨10.1007/978-3-031-33187-9_38⟩ |
| DOI: | 10.1007/978-3-031-33187-9_38⟩ |
| Popis: | International audience; Alkali sulphates are chemical products that can be used to activate and improve the performance of mineral additions, like Blast-Furnace Slag (BFS) and Fly Ash (FA). This study investigates the effect of two alkali sulphates (sodium sulphate and potassium sulphate) on delayed deformations of mortars containing a high content of BFS. Autogenous shrinkage is monitored after 2 days and basic creep tests are conducted on 28-day-old specimens loaded at 30% of their compressive strength. Their microstructure is characterized by using several experimentations, such as internal relative humidity measurements, thermogravimetry analysis and a water porosity test. A numerical model in terms of C-(A)-S-H content evolution is applied to quantify the degree of hydration advancement. The results show that the use of sodium sulphate leads to a higher autogenous shrinkage, but to a lower specific creep. This is linked to the fact that the mortars activated with sodium sulphate show a faster hydration rate and a lower porosity, which results in higher capillary pressures. However, this also limits the movement of water required for creep development. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG. |
| Databáze: | OpenAIRE |
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