Corrosion resistance of HRB500 steel rebar coated with glass fiber reinforced magnesium phosphate cement composite in 3.5% sodium chloride solution

Abstract

Electrochemical impedance spectroscopy and polarization techniques were used to assess the impact of the addition of glass fibers (GFs) in a range of concentrations to magnesium phosphate cement (MPC) on the electrochemical corrosion resistance of HRB500 steel reinforced concrete while it was immersed in a 3.5wt.% NaCl solution to simulate a marine environment. Due to the reduction in water absorption and chloride ion permeability, reinforced concrete containing 4wt% GFs was most successful in improving the corrosion resistance of reinforcement bars. The SEM micrograph of the samples showed that the addition of GFs improved the separation and irregularity structure of the steel rebar. The findings show that the GFs as an admixture improve concert durability and stop corroding ions from penetrating the surfaces of the steel rebars, suggesting that it may be a substitute material in the growth of the construction sector.