On Grouts And Grouting Of 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.

On Grouts And Grouting Of Prestressed Concrete

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Author : I. Soroka
language : en
Publisher:
Release Date : 1963

On Grouts And Grouting Of Prestressed Concrete written by I. Soroka and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1963 with categories.

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

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Author :
language : en
Publisher: Thomas Telford
Release Date : 1989

Prestressed Concrete written by and has been published by Thomas Telford this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Technology & Engineering categories.

Post-tensioning and grouting operations can be dangerous if the required care is not taken in planning, in site preparations and in execution. For prestressed concrete a good working environment is also a prerequisite for high quality. Many accidents in this type of work may be attributed to a lack of training, poor supervision, poor planning or over-familiarity with the process. This guide to good practice highlights important safety measures which are particularly applicable to prestressed concrete, dealing with precautions necessary for post-tensioning and grouting operations on site.

Cement Grouts And The Grouting Of Post Tensioned Prestressed Concrete

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Author : Itzhak Soroka
language : en
Publisher:
Release Date : 1966

Cement Grouts And The Grouting Of Post Tensioned Prestressed Concrete written by Itzhak Soroka and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with Grouting categories.

Grout For Prestressing Tendons Grouting Procedures

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Author : British Standards Institute Staff
language : en
Publisher:
Release Date : 2007-11-30

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 2007-11-30 with categories.

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

Grout For Prestressing Tendons Basic Requirements

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Author : British Standards Institute Staff
language : en
Publisher:
Release Date : 2007-11-30

Grout For Prestressing Tendons Basic Requirements 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 2007-11-30 with categories.

Grouting, Prestressed concrete, Tendons, Construction materials, Compressive strength, Volume, Dimensional changes, Viscosity, Mixing, Accuracy, Composition, Conformity

Grout For Prestressing Tendons Test Methods

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

Grout For Prestressing Tendons Test Methods 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 materials, Tendons, Prestressed concrete, Testing conditions, Compression testing, Moulding (process), Test specimens, Volume measurement, Physical property measurement

Admixtures For Concrete Mortar And Grout Admixtures For Grout For Prestressing Tendons Definitions Requirements Conformity Marking And Labelling

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Author : British Standards Institute Staff
language : en
Publisher:
Release Date : 2001-09

Admixtures For Concrete Mortar And Grout Admixtures For Grout For Prestressing Tendons Definitions Requirements Conformity Marking And Labelling 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 2001-09 with Concrete categories.

Concrete admixtures, Cement and concrete technology, Concretes, Mortars, Grouting, Prestressed concrete, Tendons, Composition, Quality control, Marking