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.
Highlights
Both aviculture and aquaculture demonstrated growth in recent years [1–3]
This study provides a systematic report concern to the porous electrode modeling using distinctive and previously methods reported (e.g., De Levie theory) [48]
We found that an excessive corrosion products formation provokes crack propagation from steel bar to paste
Summary
Both aviculture and aquaculture demonstrated growth in recent years [1–3]. Associated with this, an ecological pressure to dispose millions of tons of shell wastes and other skeletal wastes is provoked [3]. These residues are dumped in landfills or deposited along coastal regions that create environmental hazards and serious health risks [1]. In order to contribute to the disposal of these wastes and to establish a bridge between ecological and economic interests, it is essential to convert the wastes into products with some additional added value that are utilizable. Jinshan et al [3] and Islam et al [4] have reported that shells are calcium carbonate-rich sources. Investigations demonstrating the conversion of shells into limestone content to be used as promising building materials have been reported [5,6]
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