C80 solid waste concrete and preparation method thereof

The invention relates to C80 solid waste concrete and a preparation method thereof, and the concrete is prepared from the following components in parts by weight: 134 to 140 parts of water, 265 to 277 parts of cement, 184 to 200 parts of composite admixture, 780 to 800 parts of tailing machine-made sand, 215 to 230 parts of tailing machine-made coarse aggregate with grading of 5 to 15, 863 to 875 parts of tailing machine-made coarse aggregate with grading of 5 to 25 and 4.6 to 5.0 parts of polycarboxylate superplasticizer. Wherein the composite admixture is formed by compounding mineral powder, steel slag, desulfurized gypsum and a nanocrystalline nucleus type early strength agent in proportion. The C80 solid waste concrete has excellent strength, is doped with a large amount of composite admixture, fully utilizes smelting slag solid wastes such as steel slag, mineral powder and desulfurized gypsum, replaces 40% of cement in the concrete with the composite admixture prepared by a gun machine with nano crystal