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Flexible Filler Corrosion Protection Of Unbonded Post Tension Tendons
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Book Synopsis Flexible Filler Corrosion Protection of Unbonded Post-tension Tendons by : Carlos F. Castaneda
Download or read book Flexible Filler Corrosion Protection of Unbonded Post-tension Tendons written by Carlos F. Castaneda and published by . This book was released on 2017 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flexible fillers has recently been implemented as corrosion protection for post-tensioning tendons used in bridge structures in Florida. There are two different explanations why corrosion could take place: 1. water is able to reach the steel 2. Microbiologically Influenced Corrosion. The aim of this research is to evaluate corrosion protection effectiveness of five different microcrystalline waxes under different environmental conditions. Specimens tested ranged from 7-wire steel strands to single wires (12-16 cm). Another aim is the appraisal of wax degradation by fungi species. Single wires coated with each of the investigated protection materials, were sprayed with suspensions of three different fungi species and a mix of them. For single wires, independent of the environmental condition the specimen with more corrosion was Nontribos, as well as the filler coated wires contaminated with Fungi. Fungi species investigated were able to utilize the waxes as carbon source and caused different extents of MIC.
Author :fib Fédération internationale du béton Publisher :fib Fédération internationale du béton ISBN 13 :9782883940734 Total Pages :84 pages Book Rating :4.9/5 (47 download)
Book Synopsis Durability of Post-tensioning Tendons by : fib Fédération internationale du béton
Download or read book Durability of Post-tensioning Tendons written by fib Fédération internationale du béton and published by fib Fédération internationale du béton. This book was released on 2006 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: The durability of post-tensioning tendons depends undoubtedly on the durability of the materials used, but there are design concept specifics which are also of major importance: the post-tensioning layout and layers of protection such as concrete cover and selected materials in view of the aggressivity of the environment for instance. It is well known that sustainability principles guide the Engineer from the very beginning, at the project conception, during construction and the service life of a structure. Decisions made during conceptual and design stage have the largest influence on the durability and sustainability of post-tensioning tendons. fibBulletin 33 addresses the specifics for prestressed concrete structures: the durability of post-tensioning tendons. It should be noted that it does not repeat topics that have been addressed in other fib bulletins and which is common for both reinforced concrete and prestressed concrete structures. Pre-tensioning, which is used extensively in the precast industry, is not considered here, although conclusions and recommendations herein may, in many cases, also be applicable. This recommendation was prepared by Working Party 5.4.2, Durability specifics for prestressed concrete structures, in cooperation with fib Commission 9,Reinforcing and prestressing materials and systems. A preliminary version of this recommendation served as the basic document for the second workshop on "Durability of post-tensioning tendons", held on 11-12 October 2004 in Zurich. This workshop was a follow-up to the first workshop held in Ghent in 2001. Bulletin 33 includes revisions corresponding to the agreed results of the Zurich workshop.
Author :FIB – International Federation for Structural Concrete Publisher :FIB - International Federation for Structural Concrete ISBN 13 :0727702688 Total Pages :12 pages Book Rating :4.7/5 (277 download)
Book Synopsis Corrosion protection of unbonded tendons by : FIB – International Federation for Structural Concrete
Download or read book Corrosion protection of unbonded tendons written by FIB – International Federation for Structural Concrete and published by FIB - International Federation for Structural Concrete. This book was released on 1986-01-01 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unbonded tendons are popular in certain types of structure for reasons of economy and speed of construction. The FIP Commission on Pre-stressing Steels and Systems accordingly appointed an ad hoc committee to investigate available knowledge and experience and to instigate research if necessary.
Author :fib Fédération internationale du béton Publisher :fib Fédération internationale du béton ISBN 13 :288394055X Total Pages :279 pages Book Rating :4.8/5 (839 download)
Book Synopsis Durability of Post-tensioning Tendons by : fib Fédération internationale du béton
Download or read book Durability of Post-tensioning Tendons written by fib Fédération internationale du béton and published by fib Fédération internationale du béton. This book was released on 2001-01-01 with total page 279 pages. Available in PDF, EPUB and Kindle. Book excerpt: In some countries durability problems with post-tensioning tendons have in the past led to fairly restrictive regulations. Improvements to execution procedures have been developed since, and new or improved prestressing systems have been proposed, too. This development was, of course, subject of discussions in fib Commission 9 Reinforcing and Prestressing Materials and Sytems and in IABSE Working Commission 3 Concrete Structures. It was decided to organise a workshop with the aim to review the different aspects of the problems encountered and to discuss solutions available today. Keynote speakers from various countries were invited to contribute. Their papers are published in this bulletin, grouped together under the following themes: Inventory and condition (6 papers) Investigation and repair (5 papers) Technical progress (4 papers) Strategies for improvement (6 papers) Supported by the international federation for structural concrete fib, and the international association for bridge and structural engineering IABSE, the workshop took place on 15-16 November 2001 at Ghent University, celebrating the 75th anniversary of the Magnel Laboratory for Concrete Research, whose director also chaired the Scientific Committee and edited the bulletin. It needs to be emphasised that in the bulletin invited experts present their individual views. Although not yet discussed in any of the association's working bodies, the highly topical contents of the bulletin is believed to be of general interest to fib's members and to document a starting point for future work in this field. Therefore, the Council of fib agreed to exceptionally publish these papers within fib's series of Bulletins.
Author :FIB – International Federation for Structural Concrete Publisher :FIB - International Federation for Structural Concrete ISBN 13 :1874266174 Total Pages :25 pages Book Rating :4.8/5 (742 download)
Book Synopsis Tendons by : FIB – International Federation for Structural Concrete
Download or read book Tendons written by FIB – International Federation for Structural Concrete and published by FIB - International Federation for Structural Concrete. This book was released on 1995-08-01 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :FIB – International Federation for Structural Concrete Publisher :FIB - International Federation for Structural Concrete ISBN 13 :2883941459 Total Pages :118 pages Book Rating :4.8/5 (839 download)
Book Synopsis External Tendons for Bridges by : FIB – International Federation for Structural Concrete
Download or read book External Tendons for Bridges written by FIB – International Federation for Structural Concrete and published by FIB - International Federation for Structural Concrete. This book was released on 2020-12-01 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: The concept of post-tensioning has been recognized for over a century. Interestingly, early developments started with external tendons, but failed to be recognized as a major construction technique for two main reasons: - Low tensile performance of early steels in combination with a poor knowledge of concrete creep and shrinkage properties, - Lack of a durable corrosion protection. With the technological progress, external tendons became increasingly popular in the 1980’s, as a post-tensioning method enabling inspection and, if necessary, replacement of tendons without demolition of structural members. Towards the end of the last century, more than 50 bridges have been built with external tendons, first in France and soon gaining traction in other countries. FIP published a state-of the-art report in May 1996 to provide a review of the application of external tendons, describing specific material problems and methods for dealing with them. 25 years have passed and, while the engineering principles covered by the FIP report remain unchanged, the context has evolved: - External tendons and construction methods have kept evolving with better materials, ever longer spans, and tighter schedules. - Normalization frame in Europe changed, Severe durability issues have occurred in some countries from which the industry can extract good knowledge of the causes and how to avoid similar problems in the future. This new fib bulletin has been prepared with the aim to reflect the current state of the art and encompass the knowledge amassed in the last quarter of century with chapters covering from the design and approval of systems and materials to installation, quality control and monitoring. The last chapter is a compilation of structures worldwide covering all sorts of materials, typologies and construction methods, which might be a source of inspiration for owners and designers alike.
Book Synopsis CFRP Tendons for the Repair of Post-tensioned, Unbonded Concrete Buildings by : Lucio Roger Amato
Download or read book CFRP Tendons for the Repair of Post-tensioned, Unbonded Concrete Buildings written by Lucio Roger Amato and published by . This book was released on 2009 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: The deterioration of prestressed concrete structures due to corrosion is a costly problem. This problem is accelerated in cold weather climates where de-icing salts are used. These salts accelerate the corrosion of the steel tendons greatly reducing the service life of the structures and leading to constant costly repairs. Recent research has shown composite materials such as Fibre Reinforced Polymers (FRP) to be suitable alternatives to steel, providing similar strength without being susceptible to electrochemical corrosion. Carbon FRP in particular has great promise for prestressed applications, showing resistance to corrosion in environments that might be encountered in concrete and experiencing less relaxation than steel. This thesis outlines the testing and implementation of a post-tensioned system that uses CFRP tendons to replace corroded, unbonded post-tensioned steel tendons. This system was then implemented in a parking garage in downtown Toronto. To the author's knowledge, this is the first example of an unbonded, post-tensioned tendon replacement using FRP tendons. The system used split wedge anchors designed specifically for CFRP tendons at the University of Waterloo. The dead end was anchored by directly bonding the tendon to the concrete slab. Overall, the system was shown to work and provide a durable solution for unbonded post-tensioning systems. The CFRP tendon was successfully inserted in the opening left by the removal of the corroded tendon and stressed. It was found that the current anchorage configuration experienced large load losses of up to 60 % during the transfer. Changing the orientation of the anchor was found to reduce the load lost to a range of 1 % to 9 %.
Author :FIB – International Federation for Structural Concrete Publisher :FIB - International Federation for Structural Concrete ISBN 13 :1874266247 Total Pages :17 pages Book Rating :4.8/5 (742 download)
Book Synopsis Materials and systems for external prestressing by : FIB – International Federation for Structural Concrete
Download or read book Materials and systems for external prestressing written by FIB – International Federation for Structural Concrete and published by FIB - International Federation for Structural Concrete. This book was released on 1996-08-01 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Unbonded Tendons in Post-tensioned Construction by : Arthur E. Andrew
Download or read book Unbonded Tendons in Post-tensioned Construction written by Arthur E. Andrew and published by Thomas Telford Publishing. This book was released on 1987 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: This title provides an assessment of pre-stressed concrete, unbonded tendons, properties of materials, losses in pre-stress, suitable types of structures, design of floor and roof slabs of buildings using unbonded tendons, design of other structures using unbonded tendons, work on site and post-tensioning systems.
Book Synopsis High Tech Concrete: Where Technology and Engineering Meet by : D.A. Hordijk
Download or read book High Tech Concrete: Where Technology and Engineering Meet written by D.A. Hordijk and published by Springer. This book was released on 2017-06-08 with total page 2926 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the proceedings of the fib Symposium “High Tech Concrete: Where Technology and Engineering Meet”, that was held in Maastricht, The Netherlands, in June 2017. This annual symposium was organised by the Dutch Concrete Association and the Belgian Concrete Association. Topics addressed include: materials technology, modelling, testing and design, special loadings, safety, reliability and codes, existing concrete structures, durability and life time, sustainability, innovative building concepts, challenging projects and historic concrete, amongst others. The fib (International Federation for Structural Concrete) is a not-for-profit association committed to advancing the technical, economic, aesthetic and environmental performance of concrete structures worldwide.
Download or read book Heron written by C. F. Etienne and published by . This book was released on 1981 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Specification for Unbonded Single Strand Tendons by : Post-Tensioning Institute
Download or read book Specification for Unbonded Single Strand Tendons written by Post-Tensioning Institute and published by . This book was released on 2000 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Specifications are given for tendons in both normal and aggressive (corrosive) environments.
Book Synopsis Replaceable Unbonded Tendons for Post-tensioned Bridges by :
Download or read book Replaceable Unbonded Tendons for Post-tensioned Bridges written by and published by . This book was released on 2017 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: University of Florida researchers investigated the use of flexible fillers with post-tensioned tendons, including performance testing of the materials and methods of installation and inspection.
Book Synopsis Post-tensioning Manual by : Post-Tensioning Institute
Download or read book Post-tensioning Manual written by Post-Tensioning Institute and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Structural Engineer written by and published by . This book was released on 1998 with total page 996 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Corrosion of Steel in Concrete Structures by : Amir Poursaee
Download or read book Corrosion of Steel in Concrete Structures written by Amir Poursaee and published by Woodhead Publishing. This book was released on 2023-02-20 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: Essential reading for researchers, practitioners, and engineers, this book covers not only all the important aspects in the field of corrosion of steel reinforced concrete but also discusses new topics and future trends. Theoretical concepts of corrosion of steel in concrete structures, the variety of reinforcing materials and concrete, including stainless steel and galvanized steel, measurements and evaluations, such as electrochemical techniques and acoustic emission, protection and maintenance methods, and modelling, latest developments, and future trends in the field are discussed. Comprehensive coverage of the corrosion of steel bars in concrete, investigating the range of reinforcing materials, and types of concrete Introduces the latest measuring methods, data collection, and advanced modeling techniques Second edition covers a range of new, emerging topics such as the concept of chloride threshold value, concrete permeability and chloride diffusion, the role of steel microstructure, and innovations in corrosion detection devices
Book Synopsis ACI Manual of Concrete Practice by : American Concrete Institute
Download or read book ACI Manual of Concrete Practice written by American Concrete Institute and published by . This book was released on 2002 with total page 1222 pages. Available in PDF, EPUB and Kindle. Book excerpt:
