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Study on Effect of the Ternary Composite Retarder on Properties of FGD Gypsum Plaster Material

Each component ratio of the ternary composite retarder was determined through orthogonal test and the effect of the ternary composite retarder on physical properties of FGD gypsum plaster material was studied. The results show that when the dosage of citric acid, admixture 1, admixture 2 were 0.05%, 0.4% and 0.3% respectively in the ternary composite retarder, the FGD gypsum plaster material had the best physical properties. The initial setting time was 118min and the final setting time was 132min respectively. The flexural and compressive strength were 3.15MPa and 6.46MPa, respectively. The microstructure of FGD gypsum hydration products was analyzed by SEM and the action mechanism of the ternary composite retarder was analyzed.