Effect Of Voids In Grouted Post Tensioned Concrete Bridge Construction
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Effect Of Voids In Grouted Post Tensioned Concrete Bridge Construction
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Author : David Trejo
language : en
Publisher:
Release Date : 2009
Effect Of Voids In Grouted Post Tensioned Concrete Bridge Construction written by David Trejo and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Concrete categories.
Effect Of Voids In Grouted Post Tensioned Concrete Bridge Construction
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Author : United States. Federal Highway Administration
language : en
Publisher:
Release Date : 2009
Effect Of Voids In Grouted Post Tensioned Concrete Bridge Construction written by United States. Federal Highway Administration and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Concrete categories.
Post-tensioned (PT) bridges have several advantages over other bridge types: they can span longer distances, can be constructed relatively fast, and are economical. The tendons of PT bridges are critical components, essentially the backbone of the PT bridge system. Tendons consist of strands, ducts, and grout that fill the interstitial space between the strands and ducts. Grout is intended to protect the strands from corrosion, especially when the duct is damaged or water or other deleterious substances infi ltrate the tendon. However, past construction practices and materials have resulted in voids in tendons. Corrosion of the strands in these tendons has resulted in bridge failures in Europe. More recently, voids have been detected in PT bridges in the United States with some of the strands in these voids exhibiting corrosion. In fact, tendon failures have been reported on PT bridges, especially in Florida, that are exposed to aggressive environments. This history has raised concerns about conditions in PT bridges in Texas. A recent inspection of tendons in PT bridges in Texas identified voids. However, all environments in Texas may not be classified as aggressive. Research was needed to assess how the environmental and other conditions, especially the conditions inside the voids in tendons, affect the corrosion of strands and how this corrosion influences the structural reliability of PT bridges. In addition, economical and high-performance grout materials and effi cient inspection and repair methods needed to be defined.
Effect Of Voids In Grouted Post Tensioned Concrete Bridge Construction
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Author :
language : en
Publisher:
Release Date : 2009
Effect Of Voids In Grouted Post Tensioned Concrete Bridge Construction written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Concrete categories.
The objective of this research was to evaluate the corrosion activity of strands for post-tensioned (PT) structures and to correlate this corrosion activity with general environmental and void conditions. To achieve this objective, time-variant probabilistic models were developed to predict the tension capacity of PT strands subjected to different environmental and void conditions. Using these probabilistic models, time-variant structural reliability models were developed. The probability of failure of a simplified PT structure subjected to HS20 and HL93 loading conditions was assessed. Both flexural failure and serviceability were assessed. Results indicate that the presence of water and chlorides can lead to significant corrosion rates and failure is dependent on this corrosion activity and the number of strands exposed to these conditions. These results are presented in Volume 1 of this report. To assist TxDOT with developing a plan to mitigate this corrosion, studies were performed to assess repair grout materials, inspection methods, and repair methods. In addition, a general methodology is presented on optimizing repairs. These topics are presented in Volume 2 of this report.
Effect Of Voids In Grouted Post Tensioned Concrete Bridge Construction
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Author :
language : en
Publisher:
Release Date : 2009
Effect Of Voids In Grouted Post Tensioned Concrete Bridge Construction written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Concrete categories.
The objective of this research was to evaluate the corrosion activity of strands for post-tensioned (PT) structures and to correlate this corrosion activity with general environmental and void conditions. To achieve this objective, time-variant probabilistic models were developed to predict the tension capacity of PT strands subjected to different environmental and void conditions. Using these probabilistic models, time-variant structural reliability models were developed. The probability of failure of a simplified PT structure subjected to HS20 and HL93 loading conditions was assessed. Both flexural failure and serviceability were assessed. Results indicate that the presence of water and chlorides can lead to significant corrosion rates and failure is dependent on this corrosion activity and the number of strands exposed to these conditions. These results are presented in Volume 1 of this report.
Corrosion Of Steel In Concrete Structures
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Author : Amir Poursaee
language : en
Publisher: Woodhead Publishing
Release Date : 2016-02-17
Corrosion Of Steel In Concrete Structures written by Amir Poursaee and has been published by Woodhead Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-02-17 with Technology & Engineering categories.
Corrosion of reinforcing steel is now recognized as the major cause of degradation of concrete structures in many parts of the world. Despite this, infrastructure expenditure is being unreasonably decreased by sequestration and the incredible shrinking discretionary budget. All components of our infrastructure including highways, airports, water supply, waste treatment, energy supply, and power generation require significant investment and are subjected to degradation by corrosion, which significantly reduces the service life, reliability, functionality of structures and equipment, and safety. Corrosion of Steel in Concrete Structures provides a comprehensive review of the subject, in addition to recent advances in research and technological developments, from reinforcing materials to measurement techniques and modelling. This book contains not only all the important aspects in the field of corrosion of steel reinforced concrete but also discusses new topics and future trends. Part One of the book tackles theoretical concepts of corrosion of steel in concrete structures. The second part moves on to analyse the variety of reinforcing materials and concrete, including stainless steel and galvanized steel. Part Three covers measurements and evaluations, such as electrochemical techniques and acoustic emission. Part Four reviews protection and maintenance methods, whilst the final section analyses modelling, latest developments and future trends in the field. The book is essential reading for researchers, practitioners and engineers who are involved in materials characterisation and corrosion of steel in concrete structures. Provides comprehensive coverage on a broad range of topics related to the corrosion of steel bars in concrete Discusses the latest measuring methods and advanced modeling techniques Reviews the range of reinforcing materials and types of concrete
Bridge Maintenance Safety Management Life Cycle Sustainability And Innovations
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Author : Hiroshi Yokota
language : en
Publisher: CRC Press
Release Date : 2021-04-20
Bridge Maintenance Safety Management Life Cycle Sustainability And Innovations written by Hiroshi Yokota and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-04-20 with Technology & Engineering categories.
Bridge Maintenance, Safety, Management, Life-Cycle Sustainability and Innovations contains lectures and papers presented at the Tenth International Conference on Bridge Maintenance, Safety and Management (IABMAS 2020), held in Sapporo, Hokkaido, Japan, April 11–15, 2021. This volume consists of a book of extended abstracts and a USB card containing the full papers of 571 contributions presented at IABMAS 2020, including the T.Y. Lin Lecture, 9 Keynote Lectures, and 561 technical papers from 40 countries. The contributions presented at IABMAS 2020 deal with the state of the art as well as emerging concepts and innovative applications related to the main aspects of maintenance, safety, management, life-cycle sustainability and technological innovations of bridges. Major topics include: advanced bridge design, construction and maintenance approaches, safety, reliability and risk evaluation, life-cycle management, life-cycle sustainability, standardization, analytical models, bridge management systems, service life prediction, maintenance and management strategies, structural health monitoring, non-destructive testing and field testing, safety, resilience, robustness and redundancy, durability enhancement, repair and rehabilitation, fatigue and corrosion, extreme loads, and application of information and computer technology and artificial intelligence for bridges, among others. This volume provides both an up-to-date overview of the field of bridge engineering and significant contributions to the process of making more rational decisions on maintenance, safety, management, life-cycle sustainability and technological innovations of bridges for the purpose of enhancing the welfare of society. The Editors hope that these Proceedings will serve as a valuable reference to all concerned with bridge structure and infrastructure systems, including engineers, researchers, academics and students from all areas of bridge engineering.
Prestressed Concrete Bridges
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Author : Nigel R. Hewson
language : en
Publisher: Thomas Telford
Release Date : 2003
Prestressed Concrete Bridges written by Nigel R. Hewson and has been published by Thomas Telford this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Technology & Engineering categories.
Prestressed concrete decks are commonly used for bridges with spans between 25m and 450m and provide economic, durable and aesthetic solutions in most situations where bridges are needed. Concrete remains the most common material for bridge construction around the world, and prestressed concrete is frequently the material of choice. Extensively illustrated throughout, this invaluable book brings together all aspects of designing prestressed concrete bridge decks into one comprehensive volume. The book clearly explains the principles behind both the design and construction of prestressed concrete bridges, illustrating the interaction between the two. It covers all the different types of deck arrangement and the construction techniques used, ranging from in-situ slabs and precast beams; segmental construction and launched bridges; and cable-stayed structures. Included throughout the book are many examples of the different types of prestressed concrete decks used, with the design aspects of each discussed along with the general analysis and design process. Detailed descriptions of the prestressing components and systems used are also included. Prestressed Concrete Bridges is an essential reference book for both the experienced engineer and graduate who want to learn more about the subject.
Evaluation Of Strand To Grout Bond In Post Tensioned Tendons With Corrosion Inhibiting Penetrants
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Author : Kurt Kupselaitis
language : en
Publisher:
Release Date : 2019
Evaluation Of Strand To Grout Bond In Post Tensioned Tendons With Corrosion Inhibiting Penetrants written by Kurt Kupselaitis and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Bridges categories.
Post tensioning bridges is an efficient way of construction where segments of a bridge are strung together using small diameter high strength strands. The steel strands are passed through internal and/or external ducts within the concrete segments, jacked to high levels of stress, anchored using steel wedges, and then filled with a corrosion inhibiting filler. A cementitious material called grout has been widely used for over 50 years as this filler. The Federal Highway Administration design and construction manual provides recommendations in the properly filling techniques to ensure the tendons are full of grout. Despite the level of detail the manual provides, several Florida bridges that used this construction technique have seen severe corrosion related failures due to poor grout quality. Oil based products have been developed for the express purpose of reducing the corrosion rate in previously grouted tendons. Utilizing the interstitial spaces in the steel strands, low viscosity fluid is pumped through the strand which can also penetrate the surrounding grout and fill unintentional voids. However, by doing so, there is the concern that the bond strength could be compromised and increase the risk of failure. This study presents the findings of small scale grouted mono-strand tendons which determined the bond effects of defective grout, evaluated the injection capabilities of various penetrants, and determined whether or not the penetrant adversely affects bond after impregnation. No appreciable variation in bond was found.
Non Destructive Diagnostics Of Concrete Floors
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Author : Łukasz Sadowski
language : en
Publisher: CRC Press
Release Date : 2022-08-08
Non Destructive Diagnostics Of Concrete Floors written by Łukasz Sadowski and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-08-08 with Technology & Engineering categories.
Concrete floors should be diagnosed in order to obtain the proper durability. Non-destructive testing (NDT) methods, which have numerous advantages and are very effective for in situ testing, are recommended for this purpose. Non-Destructive Diagnostics of Concrete Floors: Methods and Case Studies offers useful NDT methods, test methodologies, and case studies. This book contains classifications of NDT methods, examines their areas of usefulness in floor diagnostics, and explains the complementarity and reliability of NDT methods as well as the need to calibrate research equipment. It presents interesting case studies of concrete floors, such as dowelled floors, floors with a top layer made of stone slabs, industrial floors, industrial floors with a top layer of polyurethane-cement, layered floors, post-tensioned floors, and cement screeds. The authors have drawn on many years of experience in both academia and the practical diagnosis of concrete floors using NDT methods.
Structural Materials Technology
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Author : Robert J. Scancella
language : en
Publisher: CRC Press
Release Date : 1994-01-01
Structural Materials Technology written by Robert J. Scancella and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994-01-01 with Technology & Engineering categories.