The aim of this study was to analyze the influence of adding recycled gypsum waste as an aggregate on the heat of hydration of gypsum mortar for use in internal plastering. The water/plaster ratio was set at 0.66, a value obtained through a natural consistency test, and comparative tests were carried out on natural gypsum and gypsum with 5% to 10% addition of waste. The results for plaster with 5 and 10% added waste showed a decrease in the setting time (initial and final) directly correlated with the increase in the addition of waste. That was clearly seen in the hydration heat curves, but without a proportional reduction in the useful time of the mortars, indicating an alternative to decrease the share of unproductive time in the mixing of gypsum mortar.
Recycling; Gypsum; Waste; Plastering
