This research paper provides a comprehensive review of pre-treatment techniques for enhancing recycled coarse aggregate (RCA) by removing adhered mortar (A-M) and strengthening A-M. The paper examines various techniques and their effects on different properties of RCA. Autogenous cleaning, ball milling treatment, acid treatment, thermal treatment, and microwave treatment were found effective for A-M removal. These techniques improved properties such as water absorption, density, and strength of RCA, but some treatments caused minor cracks. Slurry impregnation, polymer impregnation, carbonation treatment, sodium silicate impregnation, and bio-deposition treatment were discussed for A-M strengthening. These techniques enhanced the water absorption, crushing value, and strength of RCA, but polymer impregnation could decrease compressive strength of recycled aggregate concrete.