scholarly journals Localisation and characterisation of corrosion damage in reinforced concrete by means of acoustic emission and X-ray computed tomography

2019 ◽  
Vol 197 ◽  
pp. 21-29 ◽  
Author(s):  
Charlotte Van Steen ◽  
Lotfollah Pahlavan ◽  
Martine Wevers ◽  
Els Verstrynge
Keyword(s):  
Computed Tomography ◽  
Acoustic Emission ◽  
Reinforced Concrete ◽  
Corrosion Damage ◽  
X Ray ◽  
X Ray Computed

Use of acoustic emission and X-ray computed tomography for damage evaluation of freeze-thawed concrete

2010 ◽  
Vol 24 (12) ◽  
pp. 2347-2352 ◽  
Author(s):  
Tetsuya Suzuki ◽  
Hidehiko Ogata ◽  
Ryuichi Takada ◽  
Masao Aoki ◽  
Masayasu Ohtsu
Keyword(s):  
Computed Tomography ◽  
Acoustic Emission ◽  
Damage Evaluation ◽  
X Ray ◽  
X Ray Computed

scholarly journals A Comparative Study of Localized Corrosion and Stress Corrosion Cracking of 13Cr Martensitic Stainless Steel Using Acoustic Emission and X-ray Computed Tomography

Materials ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 2569 ◽  
Author(s):  
Kaige Wu ◽  
Kaita Ito ◽  
Ippei Shinozaki ◽  
Pornthep Chivavibul ◽  
Manabu Enoki
Keyword(s):  
Computed Tomography ◽  
Stainless Steel ◽  
Acoustic Emission ◽  
Stress Corrosion ◽  
Martensitic Stainless Steel ◽  
Localized Corrosion ◽  
X Ray ◽  
X Ray Computed ◽  
Ae Signals

An accurate evaluation of stress corrosion cracking (SCC) in 13Cr martensitic stainless steel (MSS) is still missing due to the lack of an in-situ insight into the process evolution and full characterization of the corrosion morphology. In this work, two main regimes involved in the SCC progression, including localized corrosion and cracking, were comparatively studied using in-situ acoustic emission (AE) monitoring and three-dimensional (3D) X-ray computed tomography (XCT) scanning. The stress corrosion tests were conducted with u-bent smooth specimens subjected to a single droplet of 1 μL 1% neutral NaCl solution. Localized corrosion and cracking evolution were controlled in tempered and quenched steel specimens, respectively. From XCT scanning, localized corrosion was featured by an irregular corrosion pit with deposited corrosion products containing cracks. The single dominant SCC crack was observed to initiate from corrosion pit and propagate with a 3D tortuous and discontinuous morphology. AE signals were detected in both cases. Correlated with in-situ observations and clustering analysis, source identification of AE signals was proposed. AE signals during localized corrosion were assessed to be mainly from cracking within the deposited corrosion products. Comparatively, hydrogen-bubble evolution, plastic deformation, and crack-branches coalescence were proposed as the AE sources of cracking evolution.

scholarly journals The influence of defects at the steel/concrete interface for pitting corrosion initiation studied through X-ray Computed Tomography and image analysis

2019 ◽  
Vol 289 ◽  
pp. 10011
Author(s):  
Emanuele Rossi ◽  
Timo Nijland ◽  
Oğuzhan Çopuroğlu ◽  
Rob Polder ◽  
Branko Šavija
Keyword(s):  
Computed Tomography ◽  
Image Analysis ◽  
Reinforced Concrete ◽  
Pitting Corrosion ◽  
Ct Scans ◽  
Volume Loss ◽  
Air Voids ◽  
X Ray ◽  
X Ray Computed ◽  
Concrete Interface

Although corrosion of reinforcement is a well-known issue for the construction industry, there are still open questions about some fundamentals of corrosion in reinforced concrete. These points include, among others, which are the most sensitive locations of the steel/concrete interface for pitting corrosion to initiate and to propagate. In this study, X-ray computed tomography (CT-scan) is used to characterize eight 20-years-old reinforced concrete cores naturally deteriorated due to chloride-induced corrosion. The volume loss due to corrosion of the reinforcement was quantified through image analysis of CT-scans. The volume loss of the steel was found to be higher for steel rebars embedded in Portland cement specimens rather than in blended cement specimens. Furthermore, CT-scans revealed that the deepest and most frequent corrosion pits, as well as the consequent highest volume loss of steel, were present at the portion of the reinforcement closer to the outdoor environment and in proximity to air voids at the steel/concrete interface. As a consequence, the highest decrease of structural performance of the rebars would be likely localized at those locations. Therefore, the presence of interfacial air voids should be considered as relevant factor when assessing the risk of corrosion of reinforced concrete structures.

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