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The control variable method was used to determine the reasonable amount of cementitious system, water reducing agent and early strength agent in the grouting material. Through orthogonal test, the effect of water-binder ratio, cement-sand ratio and desulfurized building gypsum content on the fluidity, compressive strength and vertical expansion rate of grouting material was studied. The experiment determined the optimal ratio of grouting material. The test results show that the main factor affecting the fluidity of grouting material is the cement-sand ratio; the main factor affecting the 1d and 3d compressive strength is the gypsum, and the main factor of the 28d compressive strength is the water-binder ratio; the main factor affecting the vertical expansion rate of 3h and 24h is the gypsum content. The optimal ratio of grouting material is: water-binder ratio of 0.23, cement-sand ratio of 1.0, the mass ratio of cement to mineral admixture is 4:1, polycarboxylate superplasticizer of 0.3%, calcium formate early strength agent of 0.7%, silicone defoamer of 0.2%, desulfurized building gypsum of 9%.

Study on the preparation and properties of new sleeve grouting material for prefabricated building