Early and precise prediction of corrosion-induced deterioration plays a crucial role in designing robust Reinforced Concrete (RC) structures with reduced carbon footprints. In light of the aforementioned, a blend of Portland Slag Cement (PSC) and alccofine concrete is considered to exhibit a durable performance even in the presence of extremely high chloride levels. By ASTM C876-91 standards, concrete cube samples with centrally positioned bars and different alccofine levels (0, 5, 10, 15, and 20%) were subjected to accelerated corrosion in a 5% NaCl solution for seven stages extending up to 105 days. Findings reveal that corrosion initiation occurred within 30–45 days in samples containing 0, 5, 10, and 20% of alccofine. Conversely, specimens with 15% alccofine replacement exhibited a passive state for up to 45 days, with corrosion initiation noted after this period. Between days 45 and 75 of testing, all specimens remained in an uncertain probability region. Following an extended testing period surpassing 90 days, the samples transitioned to active corrosion with a probability of 0.9. Notably, the 15% alccofine replacement samples displayed notable resistance against corrosion compared to other replacement percentages throughout the testing intervals. Based on the experimental findings, adjusting the optimal dosage within the 10–15% range is recommended. The pozzolanic properties of alccofine contribute to the formation of dense and compact structures within the concrete, thereby reducing permeability and enhancing durability.