Detection of Delamination and Effect of Rebar Corrosion in a Pedestrian Bridge Deck using Microwave Sar Imaging Approach

Abstract

Health and structural integrity of concrete structures are constantly affected by the changes in the environment in which they exist. In colder regions of the country, roadways, bridges, sidewalks and walkways are subjected to de-icing salts, containing chloride icons which aggressively attack embedded steel reinforcing bars (rebars) and break down passivation films to allow corrosion initiation. Corrosion byproducts (i.e., rust) occupy a larger volume than the materials that produced them. This causes internal stresses which over time lead to delamination in concrete at the steel rebar locations. Ultimately, if no rehabilitation is done, spalling of concrete occurs. A nondestructive approach capable of detecting such damage is of great interest. In this paper, we outline the preliminary results of investigating microwave synthetic aperture radar (SAR) based imaging technique for inspecting a pedestaling bridge. A section of this bridge visually showed the effects mentioned above, and as such was a great candidate for this investigation. The results of this investigation, showed the ability to detect the delamination and deterioration caused by moisture permeation into concrete. This preliminary investigation on a real pedestrian bridge shows great promise for follow up investigations.

Department(s)

Civil, Architectural and Environmental Engineering

International Standard Book Number (ISBN)

978-000000000-2

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 Science Direct, All rights reserved.

Publication Date

01 Jan 2019

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