Mechanisms of Corrosion-Induced Cracks in Concrete at Meso- and Macro-Scales

Ohtsu, Masayasu; Uddin, Farid A. K. M.

doi:10.3151/jact.6.419

Cited by 23 publications

(6 citation statements)

References 11 publications

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“…It is easily realised that AE hits arising out of concrete cracking is detected at the stage, because the expansion of corrosion products could occur. By applying the two‐domain boundary‐element method (BEM), extension of the corrosion‐induced crack in an arbitrary direction was analysed [23]. Here, experiments were conducted by simulating corrosion‐induced cracks in expansion tests.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Process and Mechanisms of Corrosion‐Induced Cracks in Reinforced Concrete identified by AE Analysis

Ohtsu

Mori

Kawasaki

2011

Strain

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Concrete structures could suffer from the corrosion of reinforcing steel bars (rebars) because of the penetration of chloride ions. For crack detection and damage evaluation in concrete, acoustic emission (AE) techniques have been extensively applied to concrete and concrete structures. In the corrosion process of reinforced concrete, it is demonstrated that continuous AE monitoring is available to identify the onset of corrosion and the nucleation of concrete cracking because of the expansion of corrosion products. At the latter stage, the expansion of corrosion products generates corrosion-induced cracks in concrete. The generating mechanisms of these cracks are studied in accelerated corrosion tests of reinforced concrete beams. Kinematics of microcracks are identified by SiGMA (Simplified Green's functions for Moment tensor Analysis) analysis of AE. It is demonstrated that AE activity at the onset of corrosion and at the nucleation of corrosion-induced cracks is in remarkable agreement with the phenomenological model of the corrosion process in steel. Then, mechanisms of corrosion-induced cracks are visually and quantitatively investigated by the SiGMA analysis.

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Section: Introductionmentioning

confidence: 99%

Corrosion Process and Mechanisms of Corrosion‐Induced Cracks in Reinforced Concrete identified by AE Analysis

Ohtsu

Mori

Kawasaki

2011

Strain

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“…Very little research has focused on nondestructive and continuous monitoring of the cracking process caused by reinforcement corrosion. Lately, non-destructive techniques, such as acoustic emission [2], x-ray attenuation and digital image correlation [3], have been used. Another non-destructive technique, namely micro-computed tomography (CT scan-ning), has been used recently for studying concrete fracture (e.g.…”

Section: Introductionmentioning

confidence: 99%

Cracking of SHCC due to reinforcement corrosion

Šavija¹,

Luković²,

Pacheco³

et al. 2016

Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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Abstract. Reinforcement corrosion is the most important deterioration mechanism affecting reinforced concrete infrastructures. After corrosion starts, expansive pressures are exerted onto the surrounding concrete, causing cracking and spalling of the cover concrete. The amount of cover cracking can possibly be reduced by using strain hardening cementitious composites (SHCCs). In this work, the ability of strain hardening cementitious composite to resist cracking due to corrosion of reinforcement is studied. An accelerated corrosion experiment is performed to speed up the corrosion process. Micro-computed X-ray tomography technique (CT-scanning) was used for monitoring rust formation during accelerated corrosion of reinforcement and subsequent cover cracking. Development of cracks in SHCC specimen was compared to a reference specimen. While the SHCC specimen developed a large number of small cracks, the reference specimen exhibited extensive spalling due to corrosion. The SHCC specimen showed superior performance compared to the reference specimen due to its multiple microcracking ability. SHCC proved to be an excellent alternative to brittle cementitious materials when corrosion induced cracking of the cover is a concern.

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“…Even though the impact-echo method was developed for detecting defects in plate-like structures, this method was successfully applied to detect flaws in other members of structures [17]. The dominant frequencies in the response signal are considered as the main key to reveal information about material characteristics and internal defects [28][29]. Fig.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of Steel Corrosion in Concrete Structures Using Impact-Echo Method

Alhawat

Khan

Ashour

2020

AMR

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The impact-echo method is commonly used for detection of flaws in concrete elements based on the shift in the thickness frequency of a plate-like member. However, there is a need to develop this efficient technique for other applications. This paper investigates the feasibility of using the impact echo-method for identifying corrosion of steel reinforcement in concrete structures. For this purpose, 180 reinforced concrete cubes were cast and tested. The main parameters studied were the amount of recycled aggregate (i.e. 0%, 25%, 50% and 100%), nanosilica (1.5% and 3%) and the steel bar diameter (12 and 20mm). Different levels of corrosion were electrochemically induced by applying impressed voltage technique for 2, 5, 10 and 15 days. The impact-echo results were correlated against the actual corrosion levels obtained by the mass loss method. The experimental results showed that the response of impact echo in terms of frequency peaks is found to be sensitive to the high and moderate levels of corrosion. However, no clear trend was observed at the initial stage of corrosion. It is demonstrated that the impact-echo testing can be effectively used to qualitatively detect the damage caused by corrosion phenomenon in reinforced concrete structures.

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Mechanisms of Corrosion-Induced Cracks in Concrete at Meso- and Macro-Scales

Cited by 23 publications

References 11 publications

Corrosion Process and Mechanisms of Corrosion‐Induced Cracks in Reinforced Concrete identified by AE Analysis

Corrosion Process and Mechanisms of Corrosion‐Induced Cracks in Reinforced Concrete identified by AE Analysis

Cracking of SHCC due to reinforcement corrosion

Evaluation of Steel Corrosion in Concrete Structures Using Impact-Echo Method

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