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

¹ Central Department of Chemistry, Tribhuvan University, Kirtipur 44618, Nepal
² Department of Chemistry, Tribhuvan M Campus, Tribhuvan University, Tansen 32500, Nepal

^* Corresponding author: neutan08@gmail.com
^† Corresponding author: bhatttari_05@yahoo.com

Abstract

Synthetic water repellent (WRep) generally blocks the ingress of corrosive factors like moisture and various gases to the reinforced steel (RS) surface through the concrete pores. Mixing such WReps in the concrete mix did not affect the anti-corrosive response to the RS infrastructures. Considering such consequences, the present work explored the uses of two synthetic water repellents (e.g., WRep-A & WRep-B) and plant-derived green inhibitors to control the corrosion stability level of the RS in the concrete matrix. The broader question of the work is to know whether the water-repellent affects the anti-degradation response to the steel in concrete at the same patterns as commonly practiced in the concrete matrix or differently when the cast reinforced concretes exposed to water-repellent suspension for a certain curing time. The concrete slab exposed for one week to the suspension mixture of 1000 ppm WRep-B+Mangifera indica (WRep-B+MILE) and 1000 ppm WRep-B+Psidium guajava (WRep-B+PGLE) extracts exhibited maximum anti-corrosive response, which is justified by corrosion potential shifting to a more positive potential zone where the reinforced steel corrosion damage state rated as <10% probability and anticipated more effective corrosion inhibiting activities compared to other concentrations used in this work.