Corrosion of reinforcing steel in concrete is the most significant deterioration process that affects reinforced concrete structures and reduces their durability. Due to the nature of corrosion process, long time (i.e., years) is needed to activate corrosion process; therefore many research works targeted providing accelerated approaches to study the corrosion activity of steel. This paper compares between the most common accelerated corrosion approaches. In addition, more than one case of study has been presented in this review study, for applying some of these accelerated approaches in detecting the corrosion activity of steel bars embedded in cementitious material (concrete/mortar). The time period required for testing, test setup and simplicity, and measured data during the test are the main points are considered in this comparison while conclusions for applying some of these methods in case studies are presented. This review paper is the base for research work, implanted currently by the authors, for studying the corrosion activity, of rebar embedded in cementitious materials made of different blended cement, using more than one accelerated corrosion approach.