Grading design method for seawater-sea sand concrete

The invention relates to the technical field of building materials, and discloses a grading design method for seawater-sea sand concrete. The grading design method specifically comprises the following steps: S1, crushing a collected seawater-sea sand mixture to eliminate particulate impurities in seawater-sea sand mixture, thereby allowing the particle size of the crushed seawater-sea sand mixture to be 0.12-0.25 mm; S2, pouring the crushed seawater-sea sand mixture into a regulating tank, regulating a temperature in the regulating tank to 30-50 DEG C and a pH value to 7.5-8.5, and soaking the seawater-sea sand mixture in the regulating tank for 5-8 hours after regulation is finished; and S3, discharging the seawater-sea sand mixture soaked in the step S2 into an anaerobic fermentation tank for fermentation, adjusting a temperature to 50-55 DEG C, conducting fermentation time for 3-5 hours, and recovering gas discharged from the fermentation tank. Under the action of ion exchange resin and an amphoteric compo