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Evaluation of synergic methods for corrosion protection of reinforced steel

Nivin M. Ahmed (Department of Polymers and Pigments, National Research Centre, Cairo, Egypt)
Essam Abdelfattah Mossalam (Department of Raw Materials, Housing and Building National Research Center, Cairo, Egypt)
Basil El-Sabbagh (Housing and Building National Research Center, Cairo, Egypt)
Eglal M.R. Souaya (Department of Inorganic Chemistry, Ain Shams University, Cairo, Egypt)

Pigment & Resin Technology

ISSN: 0369-9420

Article publication date: 15 December 2021

Issue publication date: 7 February 2022

91

Abstract

Purpose

This study aims to evaluate the effect of pH on the reinforced concrete steel protection for rebars coated with paint formulations containing talc and free from it. As the presence of talc in paints can offer high pH which cordially affects the protection behavior of the coated rebars. Additionally, this study includes evaluating the durability of concrete mixes in presence of some replacements of ordinary cement such as meta-kaolin (MK) and ground granulated blast furnace slag (GGBFS).

Design/methodology/approach

Two paint formulations were prepared containing the same ingredients except that (P1) is free from talc and (P2) contains talc. The anticorrosive behavior of painted steel in the blended concrete mixes containing MK and GGBFS was studied by using different electrochemical techniques in chloride solution. The concrete durability was evaluated by the means of compressive and bond strength beside chloride permeability. Different concrete mixes containing mineral groups or pozzolanic materials were prepared by replacing (10, and 30%) GGBFS and (5, 10 and 15%) MK as binary from cement CEM I with (w/b) 0.45 with superplasticizer ratio (SP) 2% of the binder

Findings

It was found that the presence of talc, in spite of its ability to offer high pH, has affected positively the corrosion behavior of reinforced concrete steel by forming a complex with concrete even if it is present in paint formulation and not free in the medium.

Originality/value

The results revealed that concrete blended with (30% GGBFS and 10% MK) with coated rebars with P2 containing talc showed the highest corrosion protection performance in addition to modified permeability and compression resistance.

Keywords

Citation

Ahmed, N.M., Mossalam, E.A., El-Sabbagh, B. and Souaya, E.M.R. (2022), "Evaluation of synergic methods for corrosion protection of reinforced steel", Pigment & Resin Technology, Vol. 51 No. 2, pp. 149-161. https://doi.org/10.1108/PRT-12-2020-0126

Publisher

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Emerald Publishing Limited

Copyright © 2021, Emerald Publishing Limited

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