The hydration processes of mixtures containing calcined gypsum, blastfurnace slag or fly ash, portland cement and/or hydrated lime, able to generate calcium trisulphoaluminate and silicate hydrates, have been studied by means of differential thermal analysis. Samples were aged at 55°,70° and 85°C for 16, 24 and 48 hours, followed by a further curing at room temperature and humidity up to 28 days.In the case of the systems containing slag, the optimum pre-curing temperature is 55°C and increasing the pre-curing time from 16 to 48 hours leaves the hydration degree almost unchanged.In the case of the systems containing fly ash the optimum pre-curing temperature is 85°C. Increasing the pre-curing time from 16 to 24 hours enhances the hydration degree. The further increase to 48 hours reduces the selectivity towards calcium trisulphoaluminate hydrate.In all the systems investigated the post-curing at room temperature and humidity has no significant effect on the hydration degree.Finally, the influence of the nature of raw materials depends not only on the characteristics of each component, but also on those of the others.