Mechanical Properties and Corrosion Behavior of Dual-Filler-Epoxy-Coated Steel Rebar under a Corrosive Environment

The deterioration of steel rebar in reinforced concrete is a major issue that reduces RC structures’ durability and structural integrity. Significant efforts have been devoted to developing high-performance coatings provide efficient protection the rebar, one promising approach utilize nanofiller as additives improve performance polymer resins. This study aimed corrosion resistance by applying an epoxy coating with graphene nanoplatelets (GNPs) silica nanopowders (NSs) additives. behavior nanocomposite-coated rebars was characterized via electrochemical impedance spectroscopy (EIS) test, salt spray exposure utilized evaluate coated rebars. Investigation abrasion mechanical properties conducted using falling sand test tensile coupon test. In addition, nanocomposites were scanned micro-CT explore effect binary nanofillers on intactness polymeric matrix. GNP-NS hybrid filler reduced void fraction 0.002%, whereas pure 0.07%. reinforcement found properties; addition increased strength 37.1 MPa, 56% increase compared epoxy. Additionally, fillers led improvement 16% Young’s modulus. terms resistance, Rc value about three times greater than ones single-filler during initial this remained undegraded after 200 hr exposure. contrast, group containing displayed lowest thickness loss following testing, 74% reduction loss, showing coating’s high resistance. Hence, results reveal superior wear capabilities, anticorrosion properties, durability. research provides valuable insights into implementing material protect structures, therefore significantly increasing sustainability structures.