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

Abstract

Reinforcement of steel rebar in concrete infrastructure practices for a long time, mostly to improve tensile strength as well their service time. However, shortcomings related to damage of reinforced concrete (RfC) infrastructures becomes the business of corrosion researchers over the past few years, primarily from a safety and economic perspective. In general, the steel‐reinforced concrete (SRC) infrastructures are porous, and thence water as well different atmospheric pollutant gases penetrate it, causing the corrosion damages of the rebar, which shorten the prolonged existence of the RfC structures. The research aims to differentiate the efficacy and prosperity of waterproofing chemicals and methanol extract of Mangifera indica plant leaves for controlling the RfC susceptibility using a half‐cell corrosion potential measurement method following ASTM standard. The methanolic extract of M. indica leaves and waterproofing agents show high anti‐corrosion characteristics and can prescribe for the protection of the RfC infrastructures. The corrosion controlling performance level of 1000 and 2000 ppm M. indica extracts on the steel rebars in concrete has higher than the additions of alike concentration of both the water‐repellents depend on open‐circuit corrosion potential (CoP) shifting values to a noble direction.

The anti-degradation consequences of water repellent-based inhibitors for controlling mild steel corrosion in concrete composite

“…As reported in the previous works, mixing sufficient concentrations of the commercially available two synthetic WReps in concrete matrixes did not potentially affect the anticorrosive response of the reinforced steel in concrete slabs after three months or more exposure periods in an ambient atmosphere [19]. The additions of 500−4000 mg/L of both the waterproofing additives did not show an effect to shift the corrosion potential in the areas of less corrosion zone of steel bar in the reinforced concrete slab [20].…”

“…The mild steel rod [Fig. 1(a)] used herein as a reinforced metal has the elements (in weight %); carbon (0.17 to 0.25), silicon (0.4), manganese (0.9), sulfur (0.05), phosphorus (0.05), and remained Fe [20]. The cement, sand, and gravel were mixed in a ratio of 1:2:3 [Fig.…”

Performance of Anticorrosive Measures of Steel in Concrete Infrastructure by Plant‐Based Extracts

“…indica, as noticed elsewhere. [ 49 ] The presence of abundant amounts of the anti‐corrosion secondary metabolites with aromatic ring and O, N, S atoms containing functional groups are confirmed in the methanol extract of the P. guajava and M. indica leaves from the results of the FTIR analysis. Phenols, alkaloids, flavonoids, saponins, steroids, tannins, and terpenoids so on inhibit the corrosion of the reinforced steel rod in concrete infrastructures.…”

“…The principal chemical compounds contained in the LEPG and LEMI are alkaloids, flavonoids, phenols, tannins, and terpenoids, while the LEMI showed negative tests for carbohydrates and glycosides [ 49 ] in contrast with a positive test for LEPG from the tests, as summarized in Table 2 . Similarly, the LEPG showed a negative test for saponin and steroids in contrast with the positive test for the LEMI.…”