Super-retarded concrete for pile foundation and preparation method of super-retarded concrete

The invention relates to the technical field of concrete processing, and particularly discloses super-retarded concrete for a pile foundation and a preparation method of the super-retarded concrete. The super-retarded concrete is prepared from the following raw materials in parts by weight: 240 to 250 parts of water, 250 to 270 parts of cement, 1350 to 1540 parts of sand, 1940 to 2150 parts of stone, 30 to 35 parts of fly ash, 70 to 90 parts of slag powder, 9 to 10.5 parts of polycarboxylic acid water reducing agent, 3 to 4 parts of a thickening agent and 5.5 to 7.5 parts of a retarder. The retarder is prepared from the following raw materials in parts by weight: 18-22 parts of sodium tripolyphosphate, 20-30 parts of white granulated sugar and 4-6 parts of sodium hydroxide modified N,N-bis(phosphonomethyl)glycine. Through the synergistic effect of the raw materials, the super-retarded concrete has the advantages of long setting time, high compressive strength and high breaking strength, the practicability of