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Although recycled aggregate concrete (RAC) has been extensively studied, several critical problems about its fundamental behaviors are still urgent to be figured out. Therefore, this series of two reviews re-think fundamental behaviors of RAC based on the latest literature. In the last review (Part I), the mechanical and deformation behaviors of RAC have been intensively discussed. Here for Part II, the relationships between the replacement ratio of recycled aggregates (RA) and the durability of RAC are further presented. It is found that, due to the increase of total porosity, the resistance of RAC to freeze-thaw cycles, carbonation, and chloride ion penetration is usually decreased with the increasing replacement ratio of RA. As a result, the steel corrosion and corrosion-induced cracking in RAC are more serious than those in natural aggregate concrete (NAC). The prediction models for carbonation and chloride ion penetration of RAC and the corrosion-induced crack patterns are also presented. For addressing the degradation on the performance of RAC, several enhancement technologies such as the combined/optimization pre-treatment on RA and fiber reinforcement are put forward. Finally, the prospects of the high-performance/efficiency methodologies and applications of RAC are also shown.