Method for recycling waste concrete

The invention belongs to the technical field of construction waste disposal and discloses a method for recycling waste concrete to cemented soil. The method comprises the following steps: breaking thewaste concrete, and separating and sieving, wherein the waste concrete fine aggregate with particle size of less than 4.75mm is adopted as an admixture of cemented soil; performing air drying of natural silty soil, grinding, and sieving with a 5mm sieve; adding 15-20% of the waste concrete fine aggregate and 15-18% of ordinary Portland cement into the silty soil, mixing with water to obtain a component, and maintaining for 90 days, wherein the compressive strength of the cemented soil is about 6.5MPa. The mass of each material is as follows: silty soil: 2,575-2,381kg; cement: 466-699kg; wasteconcrete fine aggregate: 582-776kg; water: 1,039-950kg. By adding 15-20% of the waste concrete fine aggregate into the cemented soil, the compressive strength is improved by 38.09% on average in comparison with the cemented s