EIS Investigation of the Corrosion Behavior of Steel Bars Embedded into Modified Concretes with Eggshell Contents

Abstract

This investigation is focused on evaluation of the corrosion behavior of embedded steel bars (SB) into concretes. Conventional and modified concretes with eggshell are prepared. Although the effect of calcium carbonate on mechanical behavior is recognized and reported, their effects as eggshell (ES) particles replacing portions of sand and cement contents are reasonably scarce. Corrosion behavior is evaluated by electrochemical impedance spectroscopy (EIS) and the potentiodynamic polarization technique. Equivalent circuit and porous electrode behavior are also considered. The novelty concerns a promising use of concrete with ES content to maintain corrosion resistance concatenated with reasonable structural properties. For this purpose, three distinct concrete mixtures are proposed, i.e., a reference and two modified concretes. One replaces 10 wt.% with cement and another 10 wt.% with sand content. It is found that porous electrode behavior helps to predict the corrosion mechanism. Finer ES particles in concrete mixture provides a rapidly passivation on rebar. This reflects positively in corrosion current density after long-term immersion. Additionally, an environmentally friendly aspect associated with economical factor constitutes a promise use of the concrete.

Enhanced Eco-Friendly Concrete Nano-Change with Eggshell Powder

“…Regarding the corrosion resistance of concretes with eggshell powder, according to generally accepted facts, concrete with ESP has a large loss in weight and strength when exposed to solutions of sulfates and chlorides [23,24]. For example, in [23], based on the results of experimental studies, it was found that the percentage of weight loss increases with the percentage of eggshell.…”

Corrosion Inhibition of Mild Steel in Hydrochloric Acid Environment Using Terephthaldehyde Based on Schiff Base: Gravimetric, Thermodynamic, and Computational Studies

“…In Figure 9 , is the environment impedance; Rct is the charge-transfer impedance; signifies the double-layer constant-phase element; refers to the adsorbed-layer impedance; is the adsorbed-layer constant-phase element. Because an equivalent circuit is used to determine the simulated values and for comparison with experimental data, a CNLS (complex nonlinear least squares) simulation was used, as previously reported [ 44 , 45 , 46 ].…”

“…The reference electrode was a saturated calomel electrode (SCE). Electrochemical tests were started about 30 min after the working electrode was submerged in the solution in order to maintain the steady-state potential [ 44 , 63 , 64 ].…”

Estudo da corrosão e da microestrutura no compósito cimentício autoadensável com substituição do agregado miúdo por resíduo de vidro

“…Em primeiro lugar, isso ajuda a determinar as reações que ocorrem em um sistema eletroquímico e selecionar um circuito elétrico a b c equivalente e avaliar seus os parâmetros. Estes contribuem para uma análise quantitativa e permitem a participação de cada elemento no mecanismo de corrosão ( Meyer et al, 2022).…”