Viscosity-reducing admixture, ultra-high performance concrete material as well as preparation method and application of viscosity-reducing admixture and ultra-high performance concrete material

The invention provides a viscosity-reducing admixture, an ultra-high performance concrete material and a preparation method and application thereof. Relates to the technical field of cement concrete. The viscosity-reducing admixture provided by the invention is prepared from the following preparation raw materials in parts by mass: 19 to 21 parts of gypsum, 19 to 21 parts of lime, 29 to 31 parts of slag, 14 to 16 parts of calcium carbonate, 4 to 6 parts of glass beads, 3 to 5 parts of nano aluminum oxide, 5 to 7 parts of nano calcium silicate and 5 to 7 parts of an additive, the additives are triethanolamine, sodium hexametaphosphate and potassium silicate. The ultra-high performance concrete material prepared by adopting the viscosity-reducing admixture disclosed by the invention has relatively low mixture viscosity, and meanwhile, the ultra-high performance concrete material prepared by adopting the viscosity-reducing admixture disclosed by the invention has relatively low slump loss. 本发明提供了一种降粘掺合料、超高性能混凝土材