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Grouting Of Tendons In Prestressed Concrete

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Grouting Of Tendons In Prestressed Concrete

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Author : fib Fédération internationale du béton
language : en
Publisher: fib Fédération internationale du béton
Release Date : 2002-01-01

Grouting Of Tendons In Prestressed Concrete written by fib Fédération internationale du béton and has been published by fib Fédération internationale du béton this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002-01-01 with Technology & Engineering categories.

Prestressed Concrete is a very efficient form of construction; it takes advantage of the strength of concrete in compression. Developed mainly over the second part of the 20th century, it has proven to be reliable and durable. However, in the 1990's some cause for concern was discovered, first in the UK and followed by many other countries of the world. It appeared that the grout, an important means of protection of the steel against corrosion for internally ducted tendons, was in some cases inadequate. Major investigations followed including physical intrusive examination of ducts, mainly in bridges, and re-writing of procedures, processes and specifications, and in 1998 FIP launched a Task Group to review their advice note "Guidelines for Grouting" which had first been published in 1990. The merger of FIP and CEB in 1998 brought this under the auspices of fib. Structural deficiencies have only been found in a small number of bridges and in most of these cases the cause is clearly identifiable as either design detailing, workmanship or materials. In the UK, the Concrete Society report TR47 "Durable Post-tensioned Concrete Bridges" had been published in 1996, which was the culmination of four years of investigative research, and contained major new specifications and procedures aimed at improving the quality of grouting. In the USA, the Post Tensioning Institute published in 2001 their guide "Specification for Grouting of Post-Tensioned Structures", which also represented major steps forward in materials and testing requirements. The American Segmental Bridge Institute has set up a Committee to re-examine their guidelines, as have many other National Bodies worldwide. In Europe, France has issued a "Fascicule No. 65A" covering requirements for grouting and there are many developments in hand in other countries. Also in Europe, a European Technical Approval Guideline (ETAG) has been published for approval of post-tensioning systems which covers several aspects of grout and grouting. In November 2001 an international workshop was held in Ghent, Belgium on "Durability of Post-Tensioning Tendons" [see fib Bulletin 15] at which international experience was exchanged. The theme was clearly apparent; those bridge owners that have looked, have found some problems with a few of their post-tensioned bridges. In most cases steps are being taken to repair existing bridges, where considered necessary, and to improve future construction by reviewing national specifications. Emphasis is being put on a multi-layer protection strategy whereby protection against corrosion is provided by waterproofing, dense impermeable concrete, sealed ducts and good quality grout. Design detailing and rain water management are seen as important aspects. It was, therefore, timely for fib to publish state-of-the-art guidelines to assist in developing and improving the quality of a major line of defence against corrosion, the cement grout. This document represents a consensus view of current practitioners of what is a rapidly developing awareness of some of the shortcomings of previous practice and suggests improvements. This document is a major update of the previous FIP Guidelines and may be taken as a future basis for updating EN 445-447. New areas include understanding of the deleterious effects of an unstable grout, bleeding and how to avoid it, the importance of training and proper procedures, mix design and testing/trials and some new test procedures. It is now understood and generally accepted that the properties of common grout made from cement and water can be very variable and sometimes unpredictable and such grout is not recommended.

Grouting Of Tendons In Prestressed Concrete

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Author : FIB – International Federation for Structural Concrete
language : en
Publisher: FIB - International Federation for Structural Concrete
Release Date : 1990-01-01

Grouting Of Tendons In Prestressed Concrete written by FIB – International Federation for Structural Concrete and has been published by FIB - International Federation for Structural Concrete this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990-01-01 with Technology & Engineering categories.

This guide deals with the grouting of tendons inside concrete members, using cement grout, and tackles the essential day to day practical matters which produce good grouting. Afer a review of objectives, it looks at ducts, inlets and outlets, grout materials and grout properties, equipment, site preparations, the grouting operation, site control and after-measures.

Grouting Of Tendons In Prestressed Concrete

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Author :
language : en
Publisher:
Release Date : 1990

Grouting Of Tendons In Prestressed Concrete written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Grouting categories.

Deals with the grouting of tendons inside concrete members using cement grout, and tackles the day to day matters, which produce good grouting. After a review of objectives, this guide looks at ducts, inlets and outlets, grout materials and grout properties, equipment, site preparations, the grouting operation, site control, and after-measures.

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.

Grout For Prestressing Tendons Grouting Procedures

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Author : British Standards Institute Staff
language : en
Publisher:
Release Date : 1912-11-30

Grout For Prestressing Tendons Grouting Procedures written by British Standards Institute Staff and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1912-11-30 with categories.

Grouting, Construction operations, Tendons, Prestressed concrete, Construction equipment, Construction materials, Temperature, Quality control, Inspection

Extending Span Ranges Of Precast Prestressed Concrete Girders

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Author : Reid W. Castrodale
language : en
Publisher: Transportation Research Board
Release Date : 2004

Extending Span Ranges Of Precast Prestressed Concrete Girders written by Reid W. Castrodale and has been published by Transportation Research Board this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Technology & Engineering categories.

At head of title: National Cooperative Highway Research Program.

Prestressed Concrete Designer S Handbook

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Author : P.W. Abeles
language : en
Publisher: CRC Press
Release Date : 1981-01-01

Prestressed Concrete Designer S Handbook written by P.W. Abeles and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981-01-01 with Architecture categories.

The third edition of this authoritative handbook provides the structural designer with comprehensive guidance on prestressed concrete and its effective use, covering materials, behaviour, analysis and design of prestressed elements. It includes numerous examples, design charts and details of post-tensioning systems.

Durability Of Post Tensioning Tendons

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Author : fib Fédération internationale du béton
language : en
Publisher: fib Fédération internationale du béton
Release Date : 2001-01-01

Durability Of Post Tensioning Tendons written by fib Fédération internationale du béton and has been published by fib Fédération internationale du béton this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001-01-01 with Technology & Engineering categories.

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.

Structural Grouts

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Author : P.L.J. Domone
language : en
Publisher: CRC Press
Release Date : 1993-12-09

Structural Grouts written by P.L.J. Domone and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993-12-09 with Architecture categories.

This book considers the properties of grouts, and how they may be formulated for different purposes, and application areas where the advantages of grouts have been assessed and ratified. Case studies illustrate benefits, problems and future potential. The book gathers together a substantial amount of information on grout properties, utilisation and

Durability Of Post Tensioning Tendons

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Author : fib Fédération internationale du béton
language : en
Publisher: fib Fédération internationale du béton
Release Date : 2006

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.

Grouting Of Tendons In Prestressed Concrete

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