Method for preparing high-performance concrete by using construction waste recycled aggregate

The invention provides a method for preparing high-performance concrete by using construction waste recycled aggregate, which comprises the following steps: S1, preparation of recycled coarse aggregate: taking waste concrete blocks, crushing into old concrete particles, and screening; treating the carbon nano tube with chitosan to obtain a modified carbon nano tube; adding the modified carbon nano tube and methoxypropyltrimethoxysilane into the old concrete particles together, uniformly stirring, and drying, so as to obtain recycled coarse aggregate; s2, preparing a powder material: mixing the recycled coarse aggregate prepared in the step S1 with the fine aggregate to prepare the powder material; s3, concrete preparation: treating palm fibers with chitosan to obtain modified palm fibers; s2, taking water, adding a water reducing agent, cement, slag powder, palm ash, methoxypropyltrimethoxysilane and modified palm fibers, then adding the powder prepared in the step S2, and uniformly stirring to prepare the co