Study on the Effect of Three Types of Calcium Sulfate on the Early Hydration and Workability of Self-Compacting Repair Mortar

Despite having a high early mechanical strength and using sulfoaluminate cement as the primary cementitious material, self-compacting repair mortar (SCRM) suffers from rapid hydration rates leading to construction time constraints. This study examined how several forms of calcium sulfate, including hemihydrate gypsum, anhydrite, dihydrate affected SCRM’s workability, process, microstructure. The outcomes demonstrated that adding gypsum sped up rate boosted its expansion rate. For with 8% 6 h after water, flexural compressive increased by 39.02% 34.08%, respectively. SCRM can be efficiently delayed although result is subpar. material exhibited lowest fluidity loss in 20 min, setting was extended, 28-day strengths were raised 26.56% 28.08%, respectively, 8 percent anhydrite.