<p>Corrosion of reinforcement steel in concrete is a major cause of infrastructure failure, particularly in marine environments where chloride ions penetrate the concrete, destroy the passive iron oxide film and initiating corrosion. While concrete's alkaline pH naturally protects rebar, chloride ingress combined with oxygen and moisture can exceed critical thresholds, leading to severe corrosion. Effective and economical solutions are urgently needed to mitigate this issue. This study investigates the efficacy of&#xa0;1-Butoxy propan-2-ol (C₇H₁₆O₂), a non-ionic surfactant, as a corrosion inhibitor for rebar in a&#xa0;simulated concrete pore solution (SPS)&#xa0;under aggressive 3.5% NaCl conditions. Unlike previous studies, this work evaluates the inhibitor’s performance over an extended period of&#xa0;60&#xa0;days, providing critical insights into its long-term stability and effectiveness in chloride-rich environments. The scientific results from gravimetric weightloss, electrochemical testing and surface morphological studies reveal the potential of the employed surfactant as an effective corrosion inhibiting admixture. Gravimetric weight loss tests revealed that rebar samples in inhibited solutions experienced 80% less weight loss compared to uninhibited samples. Electrochemical techniques demonstrated a 90% reduction in corrosion current density and a 90% increase in charge transfer resistance for inhibited samples. Scanning Electron Microscopy (SEM) confirmed improved passivation and surface protection in the presence of the inhibitor. The numerical results on 1-Butoxy propan-2-ol revealed a&#xa0;corrosion inhibition efficiency of 97%, highlighting its exceptional ability to mitigate rebar corrosion in chloride-rich environments. With its high efficiency, environmental viability, and cost-effectiveness,&#xa0;1-Butoxy propan-2-ol&#xa0;shows great potential as a corrosion inhibitive admixture for protecting rebar in marine concrete structures.</p> Graphical Abstract <p></p>