Influence of Micro and Macro Cracks Due to Sustained Loading on Chloride-Induced Corrosion of Reinforced Concrete Beams

Wang, J.; Nanukuttan, Sreejith; Bai, Yaocai

doi:10.5703/1288284315481

Cited by 5 publications

(3 citation statements)

References 15 publications

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“…It has been suggested that the fatigue load process leads to cracks in concrete structures, and the generation of cracks accelerates the corrosion of rebar steel in concrete. Wang et al [31] concluded that the load level directly affected the rate of the corrosion of reinforcement within concrete, and that microcracks generated by the fatigue load had a greater effect on the corrosion of reinforcement in concrete than macro-cracks, but to some extent, micro-cracks could heal and reduce the corrosion. Fu et al [32] also found that the presence of transverse fissures in the tensile surface of RC aggravated the corrosion of the reinforcements.…”

Section: Durability Performance Of Reinforced Concrete Under Fatigue ...mentioning

confidence: 99%

Study on Cl− Erosion of Concrete under the Combined Effect of Fatigue Load and Wet–Dry Cycles: A Review

Zhang

Cui

et al. 2023

Applied Sciences

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The service environment of concrete in the marine environment is harsh, and demands regarding the durability of marine concrete have increased. Marine concrete in harbor and wharf areas suffers from the combined effect of fatigue load, dry–wet cycles, and Cl− erosion, which can result in spalling of the concrete surface, corrosion of the internal reinforcement, and even concrete damage. This paper reviews recent research results on the durability of concrete and reinforced concrete (RC) under the combined effect of fatigue load, dry–wet cycles, and Cl− erosion. We further assess the variation in Cl− transport properties with fatigue load, the causes behind the reduction in the carrying capacity of RC products under fatigue load, the methods of Cl− erosion on concrete under the pressures imposed by dry–wet cycles, and the damage of the protective layer of concrete due to accelerated Cl− erosion caused by the action of dry–wet cycles. Further studies are needed on the durability of concrete under the action of fatigue load, wet and dry cycles, and Cl− erosion, in addition to the testing of the durability of concrete under the combined effects of the afore-mentioned various factors.

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Section: Durability Performance Of Reinforced Concrete Under Fatigue ...mentioning

confidence: 99%

Study on Cl− Erosion of Concrete under the Combined Effect of Fatigue Load and Wet–Dry Cycles: A Review

Zhang

Cui

et al. 2023

Applied Sciences

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“…On the other hand, controversial results have been reported on corrosion rate and corrosion propagation time 10,11 . Reduced corrosion initiation times in cracked RC have been reported in several studies, 12–15 associated to an increase in corrosion rate during propagation stage, 12,13 which could anyway be more marked for short exposure times, decreasing with time 10,14 and become negligible in the long‐term 15 . At this regard, more studies considering natural propagation of corrosion in presence of cracks would be useful to deepen the knowledge on the corrosion propagation phase, since many studies involve accelerated corrosion (through the application of an external current), which anyway may be not fully representative of corrosion in real structures 16 …”

Section: Introductionmentioning

confidence: 98%

Effects of cracks on chloride‐induced corrosion initiation and propagation of carbon and stainless steel rebar

Russo

Gastaldi

Schiavi

et al. 2023

Structural Concrete

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Current durability design models for reinforced concrete structures in chloride‐contaminated environments do not consider the effects of cracks, which in practice are almost inevitable. Literature reports controversial results on corrosion propagation time of carbon steel (CS) in cracked concrete, while fewer information can be found on stainless steel (SS) rebar, which can be employed as additional protection strategy. In this experimental study, corrosion initiation and propagation of CS and SS rebar in uncracked and cracked concrete are presented. Prismatic specimens, reinforced with CS and 304L SS bars were subjected to a loading procedure to induce longitudinal micro‐cracks and exposed to a 3.5% NaCl solution for more than 2 years. Corrosion was monitored with electrochemical techniques and at the end of exposure corrosive attacks were observed. Results demonstrate the fundamental contribution of micro‐cracks in accelerating corrosion phenomena for CS, while SS is still in passive conditions also in cracked concrete.

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“…Micro cracks are the outcome of poor workmanship, low quality material, and inadequate mixing, as well as the environment during the concrete pouring. Though these cracks have a minor impact on natural frequencies and mode shapes, but they can prompt corrosion of reinforced steel [6]. Macro cracks, on the other hand, alter the natural frequencies and mode shapes of the members.…”

Section: Introductionmentioning

confidence: 99%

Automated Vision-Based Loosened Bolt Detection Using the Cascade Detector

Ramana

Cha

2017

Conference Proceedings of the Society for Experimental Mechanics Series

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Numerous damage detection methods that use data obtained from contact sensors, physically attached to structures and human inspection methods have been developed. However, damage sensitive features used for these methods such as modal properties of steel and reinforced concrete structures are sensitive to environmental conditions such as temperature and humidity. Besides, human inspection is cost, labor extensive, and is controlled by the technical understanding of an individual. The uncertainties of the contact sensor methods are difficult to address with a regression model or any other temperature compensation method, and these are primary causes of false alarms. In order to address some of these challenges of the traditional sensing system, a vision-based remote sensing system can be one of the alternatives as it gives the explicit intuitions of structural conditions. In addition, bolted connections are common engineering practices, and very few vision-based techniques are developed for loosened bolt detection. Thus, this thesis proposes an automated vision-based method for detecting loosened structural bolts using the Viola-Jones algorithm and support vector machines. The test images of bolt connections are taken with a digital single lens reflex camera. The Viola-Jones algorithm is trained on two datasets of images with and without bolts. The trained algorithm localizes and crops all the bolts on test images. The SVM is trained on another dataset of loose and tight bolts to generate decision boundary for classification of the loosened and tight bolts. The cropped bolt images are binarized to calculate bolt features as head dimensions and exposed shank length. The extracted features are fed into a trained support vector machine to classify the loosened and tight bolts. We test our method on images taken by digital single lens reflex and smartphone cameras.iii A special feeling of gratitude to my loving parents. Their words of encouragement, support, and prayers helped me to come this far.iv

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Influence of Micro and Macro Cracks Due to Sustained Loading on Chloride-Induced Corrosion of Reinforced Concrete Beams

Cited by 5 publications

References 15 publications

Study on Cl− Erosion of Concrete under the Combined Effect of Fatigue Load and Wet–Dry Cycles: A Review

Study on Cl− Erosion of Concrete under the Combined Effect of Fatigue Load and Wet–Dry Cycles: A Review

Effects of cracks on chloride‐induced corrosion initiation and propagation of carbon and stainless steel rebar

Automated Vision-Based Loosened Bolt Detection Using the Cascade Detector

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