Abstract
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.
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