Preparation methods of chemical micro-corroded coral aggregate and geopolymer-based ultrahigh-strength coral concrete

The invention discloses preparation methods of chemical micro-corroded coral aggregate and geopolymer-based ultrahigh-strength coral concrete, and relates to the technical field of concrete. The preparation method of the aggregate specifically comprises the steps that coral coarse aggregate is placed and soaked in a phosphoric acid solution, taken out and directly dried to obtain chemical micro-corroded coral coarse aggregate; and after ball milling and sieving, compounding is performed by adopting a directional grading compounding method to obtain chemical micro-corroded coral sand. The coral coarse aggregate is subjected to micro-corrosion by using phosphoric acid, so that phosphate grows on the surface of the coral aggregate and in communicated pores in situ, and the porosity of the coral coarse aggregate is reduced. The chemical micro-corroded coral coarse aggregate is subjected to ball milling and screening to obtain chemical micro-corroded coral fine aggregate, and then the coral aggregate is compounded