Effects of severe heating and rehydration on poro-mechanical properties of a mortar
| Autor: | Franck Agostini, Yan Pei, Frédéric Skoczylas, Shu-cai Li |
|---|---|
| Přispěvatelé: | Laboratoire de Mécanique de Lille - FRE 3723 (LML), Université de Lille, Sciences et Technologies-Centrale Lille-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Mécanique Multiphysique Multiéchelle (LaMcube), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Université de Lille-Centrale Lille-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
[SPI.GCIV.CD]Engineering Sciences [physics]/Civil Engineering/Construction durable Biot number 0211 other engineering and technologies Internal pressure 02 engineering and technology Building and Construction engineering.material 021001 nanoscience & nanotechnology Decomposition Portlandite Material Degradation 021105 building & construction engineering Compressibility General Materials Science Mortar Composite material 0210 nano-technology Porosity [SPI.GCIV.GCN]Engineering Sciences [physics]/Civil Engineering/Génie civil nucléaire ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Cement and Concrete Research Cement and Concrete Research, 2019, 115, pp.460-471. ⟨10.1016/j.cemconres.2018.09.020⟩ Cement and Concrete Research, Elsevier, 2019, 115, pp.460-471. ⟨10.1016/j.cemconres.2018.09.020⟩ |
| ISSN: | 0008-8846 |
| DOI: | 10.1016/j.cemconres.2018.09.020⟩ |
| Popis: | A normalized mortar was severely heated at different temperatures up to 600 °C that led to a strong material degradation linked to its loss of water and to the Portlandite decomposition. These heating were followed by pure water rehydration as these operations have proven to be efficient as regards the recovery in the transfer properties. The present study is based on the main material's poromechanical property measurements with gas as the pressurized porous fluid. They are useful to indicate, after heating, the strong increase of the mortar's skeleton compressibility and of its expansion due to internal pressure. These phenomena are due to heating micro-cracking, pore widening and to a material fractioning highlighted with the increase in its Biot's coefficient. Unambiguously, rehydration led to a visible recovery of the mortar's poromechanical properties that is linked to newly formed hydrates. |
| Databáze: | OpenAIRE |
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