 |
Chemo-mechanical modeling of cement-aggregate composite affected by Delayed Ettringite Formation
The aim of this work is to predict the behavior of mature concrete affected by Delayed Ettringite Formation (DEF) at the aggregate scale. A sample composed of CEM I cement paste bonded to siliceous aggregate have been simulated with the chemo-poromechanical XPER code. The initial degradation at the paste/aggregate interface was studied, and the results show that the initial state influences ettringite precipitation and therefore cracking. Good agreement with crack propagation and swelling evolution is obtained in comparison with experimental data, but kinetics need to be improved.
