Published online by Cambridge University Press: 28 February 2011
The state of knowledge concerning the internal constitution of cement systems is reviewed. It is concluded that many properties relevant to radwaste immobilization are strongly influenced by the presence of thermodynamically metastable phases. In order to ascertain cement properties at long ages, models have been developed which include compositional and time-dependant factors. These require a validated data base. Progress in developing models and creating the data base are reviewed. In the course of accumulating data, specific radwaste species -cement interactions can also be quantified.