Beams affected by corrosion influence of reinforcement placement in the cracking

Ortega, Néstor F.; Rivas, Irene E.; Aveldaño, Raquel R.; Peralta, María

doi:10.12989/sem.2011.37.2.163

Cited by 5 publications

(2 citation statements)

References 12 publications

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“…For accelerating corrosion, in most studies, a corrosion cell is created and the corrosion is driven by passing a direct current through the reinforcement. To create the corrosion cell, a wet sponge (Silva 2013, Hansson, Poursaee, and Laurent 2006, Jung, Yoon, and Sohn 2003, Ortega et al 2011 or direct immersion inside a saline solution was adopted (Yu et al 2010, Johnson 2010, Okba, El-Dieb, and Reda 1997, Shayanfar and Ghalehnovi 2007. Passing current is an effective approach for accelerating corrosion; however, it comes with various challenges for real-size structures related to creating the electrochemical cell and achieving uniform corrosion in reinforcement distributed throughout the structure.…”

Section: Accelerated Agingmentioning

confidence: 99%

Probabilistic Multi-Hazard Assessment of Dry Cask Structures

Bencturk¹,

Padgett²,

Uddin³

2017

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This study is focused on vertical concrete dry casks and their structural performance in seismic and tip-over events, aiming for risk estimation of large seismically induced motions (large sliding and tip-over) and structural damage due to the tip-over loads. Both numerical and experimental work was conducted to investigate the long-term performance of the concrete outerpacks with an exposed surface. Material level studies provided additional data to the existing literature on how to accelerate the corrosion and alkali-silica reactivity (ASR) in concrete without altering the key properties of the material to observe significant levels of deterioration in a short period of time. The developed methods are specifically geared towards large-scale applications of structural systems. Detailed thermal analysis was performed to determine the temperature distributions in both prototype and scaled casks. Tip-over experiments were performed on both intact and aged physical models of concrete casks to compare the structural performance in terms under combined aging and mechanical loading. The influence of shrinkage, creep and gravity loading in the long-term and combined ASR and tip-over impact were investigated using detailed numerical simulations. In the probabilistic assessments, the effect of different sources of aleatory and epistemic uncertainties on the structural performance of the dry casks are studied, and probabilistic models are developed for some of the key structural responses. Fragility curves are developed for seismic sliding motion and tip-over, as well as large acceleration in case of tip-over, and effect of different parameters' variations on the response is studied herein. Probabilistic seismic analysis on a portfolio of vertical concrete dry casks is performed in this study considering common cask configurations in the United States. Probabilistic seismic demand models for the maximum sliding distance and maximum angle of rotation of the casks are developed, and seismic fragility analysis and parameter study are performed. Seismic risk of large sliding motions and tip-over is estimated. In addition, finite element models are developed to analyze the structural response of a dry cask to impact tip-over loads considering the influence of material and structural parameter variations. Impact fragility curves are developed for the mean maximum acceleration of the cask in tip-over events, and effect of geometric and material properties on the response is investigated. 2 2 Volume V 3 3 Mass M 3 3 2.5. REFERENCES

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Section: Accelerated Agingmentioning

confidence: 99%

Probabilistic Multi-Hazard Assessment of Dry Cask Structures

Bencturk¹,

Padgett²,

Uddin³

2017

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“…For accelerating corrosion, in most studies, creating a corrosion cell and driving the corrosion by passing a direct current through the reinforcement is used. To create the 3 corrosion cell, a wet sponge (Ortega et al, 2011) or direct immersion inside a saline solution was adopted (Okba et al, 1997;Shayanfar et al, 2007;Johnson, 2010). Passing current is an effective approach for accelerating corrosion; however, it comes with various challenges for real-size structures related to creating the electrochemical cell and achieving uniform corrosion in reinforcement distributed throughout the structure.…”

Section: Introductionmentioning

confidence: 99%

Material Durability Performance of Reinforced Concrete Dry Cask Storage Systems for Nuclear Waste

Gencturk¹,

Attar²

2015

Structures Congress 2015

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Dry cask storage systems (DCSS) are currently the only means of waste nuclear storage in the United States. Although these structures are designed for temporary use with an intended service-life of 20 years, in the absence of a long-term storage solution, it is highly likely that DCSS will be used for a period exceeding 50 years. Approximately 40% of all the DCSS employ a reinforced concrete (RC) outerpack for protecting nuclear waste against manmade and natural hazards as well as for radiation shielding. As such, it is essential to investigate the durability performance of the RC under environmental and mechanical conditions specific to DCSS. One of the main durability issues is identified as the corrosion of reinforcement. High temperature from the nuclear waste, ambient humidity and potential airborne chloride at the storage site increases the risk of corrosion in these structures. In this paper, two different mixtures are studied, a control mixture meeting the current specifications for DCSS and a mixture with added calcium chloride. The second mixture is intended to accelerate the corrosion for the two-year period of the experimental program. As a part of an ongoing experimental program, specimens are being tested at different ages to measure compressive, tensile and flexural strength, and mass loss due to corrosion, among others. It is expected that the results from this experimental program will help understand the long term behavior of RC DCSS.

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Behavior of concrete elements subjected to corrosion in their compressed or tensed reinforcement

Aveldaño¹,

Ortega²

2013

Construction and Building Materials

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Beams affected by corrosion influence of reinforcement placement in the cracking

Cited by 5 publications

References 12 publications

Probabilistic Multi-Hazard Assessment of Dry Cask Structures

Probabilistic Multi-Hazard Assessment of Dry Cask Structures

Material Durability Performance of Reinforced Concrete Dry Cask Storage Systems for Nuclear Waste

Behavior of concrete elements subjected to corrosion in their compressed or tensed reinforcement

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