Concrete　technology　has　significantly　advanced　towards　alternative　sustainable　and　eco-friendly　cement-based　materials.　Accordingly,　the　durability　of　real-life　blended　concrete　under　realistic　exposure　aggressive　conditions　needs　to　be　explored　in　depth.　This　study　evaluates　the　effect　of　local　raw　clay　on　the　durability　performance　of　underground　reinforced　concrete　in　a　simulated　real-life　aggressive　environment　with　combined　chloride-sulfate　attack.　Blended　limestone　cement　(LC)　containing　calcined　clay　(LC3)　or　fly　ash　(LCF)　with　40%　replacement　by　cement　mass,　were　prepared　concurrently　to　compare　the　results　with　the　traditional　OPC.　Assessment　of　durability　performance　of　reinforced　blended　concrete　was　performed　using　non-destructive　electrochemical　impedance　spectroscopy　technique　(EIS),　and　compressive　strength.　Characterization　and　elaboration　of　electrochemical　phases　were　monitored　by　X-ray　diffraction　(XRD),　thermo-gravimetric　analysis　(TGA),　and　SEM/EDS　analysis.　Electrochemical　measurements　showed　that　the　diameter　of　the　impedance　semi-circle　in　both　high　and　low-frequency　regions　of　LC3-based　reinforced　concrete　increases　as　corrosion　progresses,　while　that　of　LCF　and　OPC　decreases.　LC3　showed　the　best　corrosion　resistance　marked　by　a　lower　corrosion　rate　and　comparable　strength.　Furthermore,　LC3　binder　exhibited　a　good　hydration　degree,　with　higher　CH　and　Friedel＇s　salt　content.　Ultimately,　the　LC3　technology　improves　the　durability　performance　of　reinforced　concrete　structures　in　simulated　real-life　conditions　which　could　advance　its　application　on　the　industrial　scale.　©　2022　Elsevier　Ltd