Impact of combined organic chemical inhibitor on mechanical properties of cement pastes and steel reinforcement corrosion in concrete upon exposure to aggressive environment

Evaluation of the effect of corrosion inhibitor organic polyamines on the characteristics of cement pastes, concrete and steel reinforcement corrosion behavior. To achieve this objective, the mixtures were prepared by the addition corrosion inhibitor organic polyamines by 0%, 0.5%, 0.75%, 1%, 1.25%, 1.5%, 1.75%, 2% and 3% of Portland cement (CEMI). The rheological performance, setting times, physicomechanical characteristics, were investigated. The Various hydration products were evaluated using X-ray diffraction [XRD] and thermo-gravimetric analysis [TGA/DTG]. The localized corrosion of steel reinforcements was studied using electrochemical measurements and characterization methods (XPS) to determine the layer development and assess the efficiency of the inhibition. The results confirmed that the additions of corrosion inhibitor organic polyamines (SEDREEN-SS) up to 2% improvement the physico-mechanical characteristic of hardened cement pastes and concrete. It has been found that the addition of SEDREEN-SS inhibitor with concentration 1.25% was the optimum ratio of inhibition efficacy. The XPS results demonstrate that SS-inhibitor had migrated in through the concrete pores, and formed a protective film on the steel rebar surface. These results are promising for the SS-inhibitor in its ability to protect steel rebar in concrete in aggressive environments.