Corrosion Depth Monitoring of Sulfate-Attacked Cement using a Remote Fiber-Optic Raman Probe

Abstract

In this study, a developed portable fiber-optic Raman probe was employed alongside Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS) to evaluate corrosion depth in C3S-based cement exposed to magnesium sulfate (MgSO4). Unlike conventional laboratory Raman systems, the portable probe allows direct, on-site inspection of large-scale cement specimens, offering real-time data on microstructural changes. SEM imaging and EDS elemental mapping revealed deterioration in uncarbonated cement samples when subjected to MgSO4, highlighting the threat that sulfate attack poses to concrete in demanding environments. Another key innovation of this research is the use of carbonation as a preventive measure against MgSO4-induced damage. Results indicate that forming a protective calcium carbonate (CaCO3) layer through targeted CO2 exposure significantly reduces sulfate penetration and subsequent microstructural degradation. These findings underscore both the practicality and effectiveness of using a portable Raman probe for on-site corrosion assessment. By integrating Raman spectroscopy with SEM and EDS, this study provides a holistic view of the chemical and structural evolution of cement under sulfate-rich conditions. Moreover, the successful application of carbonation treatment paves the way for future protective measures in infrastructure, particularly in regions with aggressive sulfate environments.

Department(s)

Electrical and Computer Engineering

Second Department

Civil, Architectural and Environmental Engineering

Keywords and Phrases

Carbonation treatment; Corrosion depth monitoring; Durability; Fiber-optic Raman probe; Magnesium sulfate attack; Tricalcium silicate (C3S)

International Standard Book Number (ISBN)

978-151069098-1

International Standard Serial Number (ISSN)

1996-756X; 0277-786X

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2025 International Society for Optics and Photonics, All rights reserved.

Publication Date

16 Sep 2025

Link to Full Text

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