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Projection of 1) Onset and Subsequest Failure Rate of Bridge Post-tensioned Tendons Considering Both Corrosion and Mechanical Overload and 2) Number O

Picture for Projection of 1) Onset and Subsequest Failure Rate of Bridge Post-tensioned Tendons Considering Both Corrosion and Mechanical Overload and 2) Number O
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Post-tensioning (PT) has evolved to become an important technology for affecting integrity of large reinforced concrete structures including bridges. In the case of bridges however tendon failures resulting from wire and strand corrosion have been reported as soon as two years post construction. In response to this a series of recent publications introduced and evaluated an analytical modeling approach that projects timing of such failures given statistics that characterize wire corrosion rate (CJ 72(8) 2016 p. 991; CJ 74(2) 2018 p. 241; and CORROSION/18 paper no. 10496). The present study builds upon this model by considering and incorporating first failures arising not only from corrosion related cross section loss but also tensile overload of remaining wires strands and tendons which may or may not have experienced some corrosion and second the number of strands per tendon given that this parameter may vary from one structure to the next and perhaps within a particular structure. The significance of each of these factors is discussed and results are related to the timing of tendon failures on bridge structures.

Product Number: 51319-12802-SG
Author: William Hartt
Publication Date: 2019
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$20.00
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Practical Galvanic Series for Improved Materials Selection in Sweet Systems

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In oil and gas production and transportation dissimilar materials are frequently combined for technical and economic reasons. However the combination of dissimilar metals can result in corrosion due to galvanic or bimetallic effects. The driving force for this kind of corrosion is the difference of the corrosion potentials of the individual materials in the given environment which causes element currents the magnitude of which depends on the sum of all system resistances (Ohmic Law). Any assessment of the corrosion rates at bimetallic couplings needs the information on the corrosion (rest) potentials of the bimetallic partners in the relevant medium.Due to the lack of consistent literature data a practical galvanic series was established in this work for standard oil country tubular goods (OCTG) steels corrosion resistant alloys (CRA) as well as graphite (as gasket material) in a model sweet upstream environment. From polarization resistance measurements information was obtained on the corrosion rate of the C-steels in the absence of bimetallic coupling. Furthermore the corrosion rates encountered at the partners of bimetallic couples were quantified via mass loss measurements. The results of this work allow better assessment of the severity of bimetallic corrosion and hence a more appropriate selection of materials which prevents corrosion failures increases the integrity of assets and saves costs.
Picture for Modeling and Projecting the Onset and Subsequent Failure Rate of Corroding Bridge Post-Tension Tendo
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Modeling and Projecting the Onset and Subsequent Failure Rate of Corroding Bridge Post-Tension Tendons

Product Number: 51317--8828-SG
ISBN: 8828 2017 CP
Author: William Hartt
Publication Date: 2017
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Reviews a recently proposed predictive model that projects the onset and subsequent rate of wire and strand fractures and tendon failures as a function of time. Includes first fracture onset results for wires and strands, failure onset for tendons, failure rates and testing of simulated tendons.
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Practical Uncertainty Propagation in Corrosion Growth Estimation from Successive In-Line Inspections

Product Number: 51321-16421-SG
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