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51315-5461-Wire/Strand Slippage in Anchorages—A Potential Failure Mode for Corroding Post-Tensioning Tendons

Picture for Wire/Strand Slippage in Anchorages—A Potential Failure Mode for Corroding Post-Tensioning Tendons
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Product Number: 51315-5461-SG
ISBN: 5461 2015 CP
Author: William Hartt
Publication Date: 2015
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A forensic investigation of unbonded post-tensioning (PT) tendons on a large structure revealed relatively advanced levels of strand corrosion within and inboard of anchorages. In addition to concerns that this corrosion could result in wire and strand fractures and hence tendon failures instances were disclosed where corrosion in anchorages was sufficiently advanced that wires had disengaged from the wedge grips and elastically contracted with consequent stress reduction. While this apparently transpired in conjunction with contiguous tendon removal activities it is probable that the disengagements and resultant slippages were on the verge of occurring anyways. Such slippage constitutes a potential failure mechanism for corroding PT systems either unbonded or bonded that has not previously been disclosed.
A forensic investigation of unbonded post-tensioning (PT) tendons on a large structure revealed relatively advanced levels of strand corrosion within and inboard of anchorages. In addition to concerns that this corrosion could result in wire and strand fractures and hence tendon failures instances were disclosed where corrosion in anchorages was sufficiently advanced that wires had disengaged from the wedge grips and elastically contracted with consequent stress reduction. While this apparently transpired in conjunction with contiguous tendon removal activities it is probable that the disengagements and resultant slippages were on the verge of occurring anyways. Such slippage constitutes a potential failure mechanism for corroding PT systems either unbonded or bonded that has not previously been disclosed.
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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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51316-7121-Corrosion Induced Bridge Tendon Failures Resulting from Deficient Grout: Part I – Model Development

Product Number: 51316-7121-SG
ISBN: 7121 2016 CP
Author: William Hartt
Publication Date: 2016
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There are advantages to Post-tensioned (PT) concrete construction compared to conventional reinforcement.  However, corrosion caused tendon failures have recently been reported d/t chemically and/or physically deficient grout. A predictive model has been developed that projects onset and rate of wire and strand fractures.
Picture for Investigation & Mitigation of Corroding Bonded Post Tension Tendons
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51318-10557-Investigation & Mitigation of Corroding Bonded Post Tension Tendons

Product Number: 51318-10557-SG
Publication Date: 2018
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Evaluation of Post-Tensioned (PT) structures and the PT impregnation technique to mitigate corrosion of grouted PT tendons. Project case studies and laboratory research will be presented to demonstrate the technique and its effectiveness.
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