Microstructural mechanisms of creep in cementitious systems – Implications for the sustainability of concrete structures
| Quand ? |
Le 12/09/2022, de 11:00 à 12:00 |
|---|---|
| Où ? | Salle Condorcet |
| Participants |
Michael Haist |
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Cementitious building materials show a pronounced longterm increase in deformation when subjected to a sustained loading. This may result in excessive deflection e. g. of bridges or other structures, eventually leading to collapse. Close prediction of such deformations thus is of key importance, however with the microstructural origins of such deformations still not being understood. This lack in basic knowledge makes it even more complicated to predict the deformation behaviour of new, ecologically optimized concretes.
Within the talk, at first, the enormous practical relevance of understanding the creep behaviour in structural design will be outlined. Further, the effect of changing the concretes composition to more ecological (CO2-reduced) compositions onto creep will be shown. The main focus of the talk will be on explaining the microstructural origins of concrete creep considering nano-granular particle interaction concepts. In doing so, it can be shown, that creep is primarily caused by a slippage of hydrate particles and its extend can be directly linked to the packing density of those particles.