Corrosion Processes of Steel Reinforcement in Concrete Structures Based on Secondary Resources of Metallurgical Production

Abstract:

The study of the influence of the physical and mechanical properties of concrete on various hydraulic binders on the corrosion resistance of steel reinforcement has been carried out. As a binder, the following were considered: CEM I 42.5 N and a slag-alkaline binder (SAB) based on ground granulated blast-furnace slag of Novolipetsk Metallurgical Plant (NMP). For comparative tests, concretes of class B 25 (M300) were used on granite aggregate with a fraction of 2,5-7,5 mm. Indicators of physical and mechanical properties such as: compressive strength, porosity, water absorption coefficient and weight loss coefficient of reinforcement at the age of 28, 90 and 180 days are criterial. 5 % aqueous solutions of NaCl, Na₂S0₄ were used as working media in assessing the corrosion resistance of reinforcing steel; MgS0₄. It has been established that steel reinforcement in slag-base concrete (SBC) has high corrosion resistance, both in an aqueous solution of NaCl and in solutions of Na₂S0₄ and MgSO₄. Slag-alkali concretes are characterized by low porosity, lower water absorption coefficient in comparison with concretes based on Portland cement.

• Periodical: Key Engineering Materials (Volume 910)
• Pages: 648-656
• DOI: https://doi.org/10.4028/p-83k3bn
• Online since: February 2022
• Authors: Igor Romanenko*, Maria Romanenko, Irina Petrovnina, Konstantin Elichev
• Keywords: Alkaline Medium, Concrete, Electrochemical Reaction, Electrolyte, Ions, Metal Corrosion, Reinforced Concrete Structures, Slags

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