Menu
Search
Filters
Close
Menu

Save 20% on select titles with code HIDDEN24 - Shop The Sale Now

51316-7121-Corrosion Induced Bridge Tendon Failures Resulting from Deficient Grout: Part I – Model Development

Picture for Corrosion Induced Bridge Tendon Failures Resulting from Deficient Grout: Part I – Model Development
Available for download

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.

Product Number: 51316-7121-SG
ISBN: 7121 2016 CP
Author: William Hartt
Publication Date: 2016
Industries: Corrosion Monitoring and Control , Science of Corrosion
$0.00
$20.00
$20.00

Grouted post-tensioning has evolved to become the construction method of choice for many structures, including bridges. However, instances of corrosion induced fracture of wires and strands and failure of tendons have occurred as a consequence of either chemically or physically deficient grout (or a combination of these), where the former involves elevated levels of chlorides or free sulfates (or both) and the latter some combination of soft, chalky, separated, segregated grout with free water. In the extreme, there is the possibility of structure collapse. In response to this, a methodology has been developed whereby, first, the initial occurrence of wire and strand fracture and tendon failure and, second, the subsequent rate of fractures/failures can be projected. This was accomplished by relating occurrence of fractures and failures to the extent of wire cross section loss and its progression with time, as affected by severity of a grout deficiency or deficiencies. Primary inputs to the model include the mean and standard deviation of, first, wire corrosion rate and, second, wire fracture strength. Results indicate an initiation period as corrosion progresses for onset of fractures and failures followed by a progressively increasing fracture/failure rate up to an inflection point beyond which these rates moderate. Results from a simulated tendon are presented which serve to qualify the modeling approach.
Key words: downloadable, Post-tensioning, corrosion, bridges, grout, deficiencies, fracture, failure.

Grouted post-tensioning has evolved to become the construction method of choice for many structures, including bridges. However, instances of corrosion induced fracture of wires and strands and failure of tendons have occurred as a consequence of either chemically or physically deficient grout (or a combination of these), where the former involves elevated levels of chlorides or free sulfates (or both) and the latter some combination of soft, chalky, separated, segregated grout with free water. In the extreme, there is the possibility of structure collapse. In response to this, a methodology has been developed whereby, first, the initial occurrence of wire and strand fracture and tendon failure and, second, the subsequent rate of fractures/failures can be projected. This was accomplished by relating occurrence of fractures and failures to the extent of wire cross section loss and its progression with time, as affected by severity of a grout deficiency or deficiencies. Primary inputs to the model include the mean and standard deviation of, first, wire corrosion rate and, second, wire fracture strength. Results indicate an initiation period as corrosion progresses for onset of fractures and failures followed by a progressively increasing fracture/failure rate up to an inflection point beyond which these rates moderate. Results from a simulated tendon are presented which serve to qualify the modeling approach.
Key words: downloadable, Post-tensioning, corrosion, bridges, grout, deficiencies, fracture, failure.

Product tags
Also Purchased
Picture for Concept of Using Physics-Based Models for Real Time Corrosion Monitoring
Available for download

51316-7128-Concept of Using Physics-Based Models for Real Time Corrosion Monitoring

Product Number: 51316-7128-SG
ISBN: 7128 2016 CP
Author: Fengmei Song
Publication Date: 2016
$20.00

 The concept of using physics-based models for corrosion monitoring is still new although corrosion monitoring by use of hardware coupons and probes is well recognized.  This paper describes the application in downstream related to crude unit overhead and demonstrates how the monitoring concept can be used and its benefits.
Picture for Risk Assessment And Downhole Chemical Treatment Program For Production Wells Within The Wafra Field
Available for download

51316-7115-Risk Assessment And Downhole Chemical Treatment Program For Production Wells Within The Wafra Field

Product Number: 51316-7115-SG
ISBN: 7115 2016 CP
Author: Tariq Kamshad
Publication Date: 2016
$20.00

Chemical treatment of reservoir fluids within the wellbore is essential for the control of associated corrosion and scale deposition. The Wafra Risk Assessment was developed with the Likelihood of Failure (LoF) based on historical corrosion well workover failures and the Consequence of Failure (CoF) directly tied to oil daily oil production.
Picture for Considerations on The Selection of Protective and Concrete Weight Coatings for Offshore Pipelines
Available for download

51316-7107-Considerations on The Selection of Protective and Concrete Weight Coatings for Offshore Pipelines

Product Number: 51316-7107-SG
ISBN: 7107 2016 CP
Author: Carlos Fernandez
Publication Date: 2016
$20.00

This study is focused on description, discussion and analysis of the different technologies available against external corrosion in offshore export pipelines and its suitability for the Venezuelan pipeline offshore projects. Several anti-corrosive protective coatings and concrete weight coating were evaluated.
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support