Effect of pitting corrosion on capacity of prestressing wires

Darmawan, Muhammad Sigit; Stewart, Mark G.

doi:10.1680/macr.2007.59.2.131

Cited by 76 publications

(41 citation statements)

References 16 publications

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“…The testing by Darmawan and Stewart (2007) suggests this is not the case and failure is a ductile necking-down process somewhat similar to that occurring in non-corroded strands, although the ductility capacity (i.e., ability to reach high ultimate strain capacity) is significantly less.…”

Section: Delaware Lake Spillway Anchor Corrosion Testingmentioning

confidence: 98%

“…5.5 Effect of pitting corrosion on capacity of prestressing wires Darmawan and Stewart (2007) performed comprehensive corrosion testing for prestressed beams and slabs. The approach used was considered comprehensive because:…”

Section: Delaware Lake Spillway Anchor Corrosion Testingmentioning

confidence: 99%

“…This generally occurs when unprotected steel is exposed to the environment. Darmawan and Stewart (2007) derive relationships between pit depths and cross-sectional loss. Further, they derive stress intensity factors for both stress corrosion cracking and brittle fracture.…”

Section: Overview Of Post-tensioning Corrosion and Defectsmentioning

confidence: 99%

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Assessing Corrosion Damage and Corrosion Progression in Multistrand Anchor Systems in Use at Corps Projects

Ebeling¹,

Strom²,

Hite³

et al. 2013

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Stressed steel tendons have been used to strengthen hydraulic structures and to improve their serviceability and stability. Over the past three decades, the US Army Corps of Engineers has worked to upgrade its projects by installing high-capacity, post-tensioned foundation anchors. The goal has been to achieve structural stability for Corps hydraulic concrete structures and/or to remediate cracked concrete monoliths. Substantial improvements to protect multistrand anchor systems from corrosion have been made since they were first used at Corps projects more the 50 years ago. Corrosion of older multistrand units is of concern.Researchers at the US Army Engineer Research and Development Center (ERDC) are looking to develop engineering procedures to estimate the current state of load-carrying capacity of the ground anchorage, to estimate remaining life of the tendon, and to establish the deterioration of anchorage capacity (with time) so costly replacement of ground anchorage can be delayed until absolutely needed. Analytical, laboratory, and field-testing efforts will be used to develop a methodology and analytical models. Probabilistic procedures will be used to quantify uncertainties for the primary variables and will be carried into the analytical model. Procedures to extend the life of deteriorating multistrand tendons also will be investigated.A review of Corps projects using multistrand anchors and a literature review of corrosion of the anchors are summarized in this report. Also included are the history and performance of the multistrand anchors at the John Day Navigation Lock (Columbia River, Portland District), along with postinstallation lift-off test results. A summary of a review of nondestructive testing (NDT) to identify defects in the anchors is part of this report, too.

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Section: Delaware Lake Spillway Anchor Corrosion Testingmentioning

confidence: 98%

Section: Delaware Lake Spillway Anchor Corrosion Testingmentioning

confidence: 99%

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Assessing Corrosion Damage and Corrosion Progression in Multistrand Anchor Systems in Use at Corps Projects

Ebeling¹,

Strom²,

Hite³

et al. 2013

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“…For uniform corrosion (carbonation) Rcorr = 1, for pitting corrosion (chlorides) Rcorr = <2; 4> according to [9] or Rcorr = <4; 5.5> according to [10]. Effective bar diameter for both types of corrosion is obtained from:…”

Section: Carbonation During Propagation Phasementioning

confidence: 99%

Reinforcement Corrosion in Concrete Due to Carbonation and Chloride Ingress Up and Beyond Induction Period

Hájková¹,

Jendele²,

Šmilauer³

et al. 2016

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)

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“…Various methods and criteria have been used to assign a numerical value to the pitting factor: for Gonzalez et al (1995) the value of R ranges from 4 to 8; for Darmawan and Stewart (2007), R = 8 ÷ 11; for Tuutti (1982), R = 4 ÷ 10. In addition, the cavity generated by the pitting attack, may have a variety of geometries.…”

Section: Corrosion Model For Prestressing Reinforcementmentioning

confidence: 99%

The influence of degradation phenomena on collapse modes in prestressed concrete beams

Sgambi

Malerba

Gotti

et al. 2012

IJLCPE

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Abstract:The static capacities of reinforced and prestressed concrete beams are characterised through their failure modes, which describe the internal force redistribution as well as the kinematic evolution which leads to the collapse of the structure. For a given structural element, a change in material and/or sectional characteristics due, for instance, to damaging effects induced by environmental aggressive agents, may change the element behaviour. In this paper, a computational approach, suitable to deal with the analysis of R.C. and P.C. concrete elements with steel bars and/or tendons subjected to corrosion is presented. The effects of the diffusion of aggressive agents, of the onset and of the development the corrosion state in the reinforcement and the corresponding mechanical response are studied. The damage development and the mechanical behaviours are dealt as coupled phenomena. A set of comparative applications shall demonstrate how in P.C. beams, the corrosion could switch a collapse of flexural type to one of shear type.

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Effect of pitting corrosion on capacity of prestressing wires

Cited by 76 publications

References 16 publications

Assessing Corrosion Damage and Corrosion Progression in Multistrand Anchor Systems in Use at Corps Projects

Assessing Corrosion Damage and Corrosion Progression in Multistrand Anchor Systems in Use at Corps Projects

Reinforcement Corrosion in Concrete Due to Carbonation and Chloride Ingress Up and Beyond Induction Period

The influence of degradation phenomena on collapse modes in prestressed concrete beams

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