Study on the effects of green-based plant extracts and water-proofers as anti-corrosion agents for steel-reinforced concrete slabs

Abstract

Widespread applications of reinforced concrete structures have been practiced since the 20th century because of their excellent properties despite their early corrosion degradation. For the control of such a problem, a design strategy of corrosion-resistant environments of the reinforced concrete structures is highly desirable for extending of a lifetime. The present research work was focused to investigate the effects of the green plant extract-based inhibitors from Vitex negundo and Catharanthus roseus leaves, and one waterproofing chemical (PtS) for controlling the corrosion susceptibility of concrete rebar using a half-cell potential method following the ASTM C876-91 standard. Both plant extracts have good anti-corrosion properties, and hence could be applied as green concrete additives to increase the corrosion resistance of the steel reinforcing bars. The anti-corrosion performance of the steel rebars in concrete is remarkably higher with the additions of 1000 and 2000 ppm plant extracts than the additions of waterproofing chemicals used, based on the shifting of corrosion potential (ϕcorr.) values to a more positive direction than −126 mV (SCE). The results agreed that both the plant extracts could be promising for the formulation of effective, ecofriendly anti-corrosion additives to delay the corrosion susceptibility of the concrete infrastructures.

A comparative study of the anticorrosive response ofTinospora cordifoliastem extract for Al and Cu in biodiesel-based fuels

“…The METcS extract from stem powder of the T. cordifolia plant was acquired by soxhlet extraction using the rotatory evaporation technique, as explained elsewhere [34]. Then, the methanol extract was dried and stored at 4 °C before its use as biofuel additives.…”

Evaluation of Corrosion Condition of Some Steel-Reinforced Concrete Infrastructures Available In Pokhara Valley of Nepal

“…Then, the ϕ corr value of each reinforcing concrete structure at the randomly fixed four points named as 1, 2, 3, 4, was recorded using a Hong Kong made UNI-T model digital voltmeter against the saturated calomel electrode (SCE), and recorded ϕ corr value is the average of four points. The SCE (reference) and the reinforced steel rod (working electrode) were connected to the voltmeter for recording potential values using the HCPM method, as described elsewhere (Bhattarai et al 2021). It is meaningful to note that, all the ϕ corr are expressed in SCE scale hereafter.…”

Comparative Studies on the Anti‐Corrosive Action of Waterproofing Agent and Plant Extract to Steel Rebar

“…[27] As a result of these constraints of the waterproofing agents, a careful design of new anti-corrosive bio-components extracted from green parts of plants especially leaves, and their uses have proven to be an effective for the protection of different steels in aggressive environments, [28,29] and in concrete infrastructures. [30][31][32][33] Besides, Nepal origin Vitex negundo, [34] and Areca catechu [35] plant extracts proved as efficient corrosion inhibitors to upgrade anti-corrosion properties of mild steel in different corrosive environments, even in concrete slab, [36] which is presumably owing to the presence of abundant amounts of hetero-atoms and aromatic ring compounds as the major phytoconstituents in the plant extracts. [37] However, little is known about the inhibiting aspects of leaf extract of Mangifera indica plant on the steel corrosion.…”