Summary of research on pretreatment methods of recycled aggregate

The recycled aggregate obtained by simple crushing and screening of waste concrete has a rough surface many protruding edges corners, most the is attached with old mortar, when directly used as in concrete, water demand large, strength elastic modulus are low, durability poor. Therefore, proper treatment required.This article summarizes research status pretreatment methods mechanical strengthening, heating grinding, solution impregnation, cement slurry carbonization treatment, nano-modification, microbial modification cleaning etc., simply analyzes advantages disadvantages various methods, which provide reference for processing methods.