Effect of Resins / Exudates Inhibited Steel on the Flexural strength of Reinforced Concrete Beam under Corrosive Environment

Abstract

Experimental research work was performed and investigated on uncoated and corrosion inhibitors (Symphonia globulifera linn) resins / exudates paste coated steel reforcing bar. This was to determine the coating effects of corrosion on flexural load and midspan deflection on structural capacity of reinforced concrete beam members under harsh saline marine environment, represented in the laboratory with sodium chloride (NaCl) as corrosion accelerator. Corrosion test was performed on uncoated and coated concrete beam members with varying coating thickness of 150μm, 250μm and 350μm , embedded into concrete and cured for 90 days. Results obtained confirmed corrosion potential with the presence of stress within the steel and concrete surrounding, spalling and cracking. Further results obtained on comparison between uncoated (corroded) and coated are flexural failure load 22.50% to 29.50%, midspan deflection 39.30% to 31.14%, tensile strength 10.17% to 11.84% and elongation 46.30% to 32.40% respectively. Thus, results showed decreased in failure load and tensile strength of corroded members while increased in midspan deflection and elongation. This attributes was due to effect of corrosion and reduction in strength from degradation properties. Resins / exudates coated members showed higher failure load with low deflection.