Geopolymer local network evolution under time and temperature

This study was undertaken in the context of Cigéo project to investigate use geopolymer for potential applications high level waste cell. The aim evaluate structural evolution potassium metakaolin based as a function time and temperature geological nuclear disposal applications. mechanical properties, local structure, porosity binder composites stored at 0.5 20 months 90 °C were studied. It shown decrease density stability strength over slight °C. Moreover, it evidenced structure nucleation small amount zeolite type phase mesoporosity favored time. However, an increase pore size due coalescence water removal. A model aging proposed order elucidate changes temperature. has been that induces distribution but seems not degrade properties final material.