The intricate structure of sluice coupled with the high dosage of binder materials in pumped concrete can lead to various cracks. We examined the performance of pumped concrete mixed with fly ash, slag powder, or both in various dosages. Experimental tests include concrete mixing, mechanical properties, deformation, thermal characteristics, and durability. Findings indicate that mineral admixture combining slag powder and fly ash significantly enhances concrete mix performance. Specifically, concrete incorporating 20% fly ash and 20% slag powder exhibits nearly equivalent strength to concrete with 30% fly ash alone, while reducing the adiabatic temperature rise by 2.9 ℃ and improving crack resistance. This composite admixture could help address the cracking problem for the pumped concrete used in the sluice of the Yangtze River to Huaihe River Diversion Project.