National foreword

This British Standard is the UK implementation of EN 446:2007. It supersedes BS EN 446:1997 which is withdrawn.

The UK participation in its preparation was entrusted by Technical Committee B/525, Building and civil engineering structures, to Subcommittee B/525/2, Structural use of concrete.

A list of organizations represented on this committee can be obtained on request to its secretary.

This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.

Compliance with a British Standard cannot confer immunity from legal obligations.

This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2007

This European Standard was approved by CEN on 21 June 2007.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

Foreword

This document (EN 446:2007) has been prepared by Technical Committee CEN/TC 104 “Concrete and related products”, the secretariat of which is held by DIN.

This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by April 2008, and conflicting national standards shall be withdrawn at the latest by April 2008.

This document supersedes EN 446:1996.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

Introduction

In post-tensioned prestressed concrete construction, the grouting of tendons is an important operation. The intention of this European Standard is to provide a specification for grouting, compliance with which will satisfy the requirements in prEN 13670.

The main function of grouting is to

Provide protection to the prestressing steel against corrosion;
Provide a bond between the prestressing steel and the ducts where required for the design of the structure;
Allow the transfer of compressive stresses in the structure in a direction transverse to the internal tendons;
Fill all voids where water may accumulate and cause frost damage.

The testing regimes anticipated by this European Standard include three levels:

Initial type and audit testing in accordance with EN 447;
Suitability testing for confirmation of the selected grout for a specific project in accordance with this standard;
Inspection during the production of grout on a specific project in accordance with this standard.

The test methods for each of the regimes are given in EN 445.

System of CEN and EOTA documents as basis for design, execution and materials selection for protective measures of prestressing systems (only main modules).

1 Scope

This European Standard gives the procedures to be used for grouting of tendons in post-tensioned prestressed concrete. It is applicable to all types of structures including bridges and buildings.

This standard also covers suitability testing and inspection testing for grouts and their component materials used on a project.

2 Normative references

3 Terms and definitions

4 Documentation

4.1 Execution specification

4.2 Quality plan

4.3 Execution documentation

5 Materials

6 Grout assessment

6.1 Suitability testing

6.2 Project specific grouting tests

7 Equipment

7.1 General

7.2 Mixer

7.3 Pump

7.4 Hoses

7.5 Inlet connections

7.6 Stand-by and emergency equipment

8 Grouting procedures

8.1 Inlets, outlets and tendon anchorages

8.2 Precautions before grouting

8.3 Temperature at grouting

8.4 Grouting operations

8.5 Precautions after grouting

9 Quality Management

9.1 General

9.2 Personnel

9.3 Inspection

9.4 Conformity criteria

9.5 Action in the event of a non-conformity

Bibliography

BS EN 446:2007

Grout for prestressing tendons. Grouting procedures

Current

Published:

30 Nov 2007