The invention provides a method for reinforcing recycled coarse aggregate by using a
biotechnology, and belongs to the technical field of recycled aggregate concrete. The recycled coarse aggregate with improved strength is prepared through the steps of crushing, baking and inactivating, soaking treatment,
algae seed
inoculation, culture, maintenance and the like on the waste concrete; wherein the
algae species comprise one or a mixture of more of
coleus, pseudocladosporium,
nostoc,
schizonepeta,
coleus,
oscillatoria and
eyebrow algae, and the algae species comprise one or more of the
coleus, the pseudocladosporium, the
nostoc, the
schizonepeta, the
oscillatoria and the
eyebrow algae. According to the invention, the desert algae are utilized to reinforce the recycled coarse aggregate, reduce the water absorption, improve the compression resistance and increase the compactness, so that the recycled coarse aggregate has better compatibility with new
mortar, the interface transition area of the recycled coarse aggregate and the new
mortar is more compact, and the binding power is obviously improved, thereby further improving the strength of the recycled concrete; the application range of the recycled concrete is wider, so that the application of bulk building waste concrete is realized.