Method for detecting water-reducing rate of building gypsum

The invention discloses a method for detecting the water-reducing rate of building gypsum, and belongs to the technical field of building gypsum detection. The method comprises the following steps: S1, respectively weighing a certain amount of building gypsum powder, and respectively adding a certain amount of retarder into the weighed building gypsum powder to adjust the initial setting time and the final setting time; s2, respectively weighing a certain amount of the building gypsum powder doped with the retarder in the step S1, respectively adding a certain amount of water, respectively measuring the fluidity of the building gypsum after stirring, and respectively recording the water consumption w2 when the fluidity is 180 +/-5mm; s3, respectively weighing a certain amount of the building gypsum powder doped with the retarder in the step S1, respectively adding a certain proportion of a water reducing agent, respectively adding a certain amount of water, respectively measuring the fluidity of the building