Influence of calcination temperature on hydration behavior, strength, and weathering resistance of traditional gypsum plaster

The mineralogical composition, microstructure, and reactivity of traditional gypsum, a multiphase product, is closely connected to its calcination temperature, but systematic studies which relate those features mechanical properties weathering resistance plasters are scarce. Here we examined the hydration behavior gypsum calcined between 100 1000 °C, contained varying amounts uncalcined bassanite, and/or anhydrite II. Detailed textural allowed identification underlying mechanisms leading differences in plaster performance related (i) delayed II along with modifications pore system; (ii) filler effect exerted by gypsum; (iii) disruption matrix (iv) seeded crystallization presence Findings this study further understanding open opportunities for development sustainable building materials designing optimized gypsum-based mixtures specific application.