Previous studies of the non-ideal behavior of condensed explosives with metal particle additives have shown that the explosives' behavior is different than that predicted by equilibrium codes. Generally lower detonation velocities and pressure are measured, although under many circumstances an increase in performance of metallized explosives is measured. Little to date has been measured regarding the complex kinetics mechanism that is present in these flows under extreme conditions in excess of 30 GPa and 5000 K, respectively. To investigate these phenomena, an unsteady, one-dimensional model is presented that simulates the build-up toward steady detonation of an organic explosive, HMX, containing dispersed aluminum particles. Results indicate that under certain combinations of heat transfer rate and chemical release rate, the measured behavior (data) can be reproduced with a generalized model. The results indicate that these phenomena have a significant effect on the detonation structure, suggesting future models which would include detailed more complex heterogeneous physical chemistry.