The corrosion of steel reinforcement has been a prime concern for concrete users. Chloride ingress into the concrete matrix disturbs the passive layers in the vicinity of steel, which results in corrosion initiation. Cementitious materials were successfully implemented in concrete mixtures to enhance their properties and minimize chloride permeability into concrete. Although numerous tests and techniques have been developed over the past years, reliable assessment of chlorides remains a challenging task. Th.is study aims at enhancing the understanding of techniques used for the assessment of chloride ingress and investigating potential correlation between these techniques. The study comprised eighteen mixtures made with various water-to-cementitious materials ratios, with and without organic and inorganic corrosion inhibitors. Mixtures incorporated ordinary cement, high-slag cement and silica fume. Together with conventional fresh and hardened concrete testing, the assessment techniques included rapid chloride permeability test, ponding test, permeability index and macrocell potential technique. Steel bars were removed from concrete after exposure to chlorides and were visually inspected. A computer model, which was developed at the University of Toronto by Thomas and Bentz, was also utilized to predict the duration for corrosion initiation associated with the various mixtures in order to compare the output with the experimental results. The study highlights the discrepancy between various test results and the level of reliability associated with each assessment technique. It also pinpoints potential correlation between these techniques. The study reveals that the cementitious materials play a more pronounced rule in miniizing corrosion risk when compared with the corrosion inhibitors. The organic inhibitor herein exhibited better performance than the inorganic inhibitor. The study shows that combining specific assessment techniques strengthens the reliability of results and enhances the assessment of chloride ingress and hence the assessment of corrosion risk.
School of Sciences and Engineering
Interdisciplinary Engineering Program
Date of Award
Online Submission Date
Mohamed Nagib Abou-Zeid
Committee Member 1
Mounir Mohamed Kamal
Committee Member 2
Committee Member 3
Library of Congress Subject Heading 1
Library of Congress Subject Heading 2
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(2003).Assessment of chloride ingress into concrete [Thesis, the American University in Cairo]. AUC Knowledge Fountain.
Bassuoni, Mohamed Tamer Farouk. Assessment of chloride ingress into concrete. 2003. American University in Cairo, Thesis. AUC Knowledge Fountain.
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