The construction of huge concrete structures with gradually complex designed forms that have congested reinforcement has been increased. Therefore, the need to improve the current practices of concrete technology to introduce new kinds of concrete with superior properties has attracted the researchers to conduct more studies in this regard. As a result, the researchers achieved their goal and developed a new kind of concrete which is known as self-compacting concrete (SCC). Meanwhile, one of the biggest challenges facing the industry of the civil engineering is how to be eco-friendly. One way is by using the natural resources judiciously in construction practices. Another way is by utilization of recycled materials in the production of concrete. The amount of the destructed and demolished waste that has been increased due to the great request of materials of construction in current years put an enormous pressure on nature. So, this has made the use of recycled aggregate in concrete a vital step towards eliminating the depletion of the natural resources of aggregate, sustainability enhancement and protecting the environment. This paper presents a review on the effect of recycled concrete aggregate (RCA) on the mechanical properties of self-compacting. Despite the reduction in its mechanical properties, SCC made with RCA can be easily used in constructing structural elements and help in enhancing the sustainability of concrete.
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