SIST EN 446:2008

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Grout for prestressing tendons - Grouting proceduresInjekcijska masa za prednapete kable - Postopki injektiranjaCoulis pour câble de précontrainte - Procédures d'injection de coulisEinpressmörtel für Spannglieder - EinpressverfahrenTa slovenski standard je istoveten z:EN 446:2007SIST EN 446:2008en,fr,de91.100.30ICS:SIST EN 446:19981DGRPHãþDSLOVENSKI
STANDARDSIST EN 446:200801-marec-2008







EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 446October 2007ICS 91.100.30Supersedes EN 446:1996
English VersionGrout for prestressing tendons - Grouting proceduresCoulis pour câble de précontrainte - Procédures d'injectionde coulisEinpressmörtel für Spannglieder - EinpressverfahrenThis 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 EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards 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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial 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.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2007 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 446:2007: E



EN 446:2007 (E) 2 Contents Page Foreword.3 Introduction.4 1 Scope.6 2 Normative references.6 3 Terms and definitions.6 4 Documentation.6 4.1 Execution specification.6 4.2 Quality plan.7 4.3 Execution documentation.7 5 Materials.7 6 Grout assessment.8 6.1 Suitability testing.8 6.2 Project specific grouting tests.8 7 Equipment.9 7.1 General.9 7.2 Mixer.9 7.3 Pump.9 7.4 Hoses.9 7.5 Inlet connections.10 7.6 Stand-by and emergency equipment.10 8 Grouting procedures.10 8.1 Inlets, outlets and tendon anchorages.10 8.2 Precautions before grouting.10 8.3 Temperature at grouting.11 8.4 Grouting operations.11 8.5 Precautions after grouting.11 9 Quality Management.12 9.1 General.12 9.2 Personnel.12 9.3 Inspection.12 9.4 Conformity criteria.15 9.5 Action in the event of a non-conformity.16 Bibliography.17



EN 446:2007 (E) 3 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.



EN 446:2007 (E) 4 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: (1) Initial type and audit testing in accordance with EN 447; (2) Suitability testing for confirmation of the selected grout for a specific project in accordance with this standard; (3) 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.



EN 446:2007 (E) 5
System of CEN and EOTA documents as basis for design, execution and materials selection for protective measures of prestressing systems (only main modules). EN 1992 Eurocode 2:Design of concrete structures prEN 13670 Execution of concrete structures ETAG 013 Post-tensioning kits for prestressing
of structuresEN 446 Grout for prestressing tendons Grouting proceduresEN 447 Grout for prestressing tendonsBasic requirementsEN 445 Grout for prestressing tendonsTest methods CEN Workshop Agreement CWA 14646 Requirements for the installation of post-tensioning kits for prestressing of structures and qualification of specialist company and its personnel.



EN 446:2007 (E) 6
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 The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 445, Grout for prestressing tendons – Test methods EN 447, Grout for prestressing tendons – Basic requirements prEN 13670, Execution of concrete structures
3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 grout homogeneous mixture of cement and water, it may contain admixtures and additions 3.2 grouting injection of grout into ducts in a continuous operation 3.3 tendon assembly of prestressing steel and sheath with anchorages and all necessary auxiliary components to permit grouting, either placed internally or externally to the concrete structure 3.4 specialist contractor contractor or construction enterprise which carries out grouting of tendons 4 Documentation 4.1 Execution specification Before starting any part of the grouting works, the execution specification relevant to that part of the works shall be complete and available.
The following items shall be included in the execution specification:  reference to this European standard;



EN 446:2007 (E) 7  reference to other relevant European standards;
 reference to ETAs for the post-tensioning kit;
 reference to other relevant national regulations and standards;  information and requirements for the particular project prepared to supplement and qualify the requirements of the above listed documents;  drawings and other technical documents needed for the execution. In addition where relevant, procedures shall be established for:  making alterations to previously agreed requirements;  distribution, the filing and recording of technical documents used for the works.
4.2 Quality plan If a quality control procedure for grouting works is required by the execution specification, it shall be available at the site. 4.3 Execution documentation The specialist contractor shall keep available on site written method statements covering materials, equipment, grouting procedures and inspection all adapted to the extent and complexity of the project. Provisions for the case of unusually low or high temperatures or delayed grouting, if likely to occur during the project duration, shall be specified.
The specialist contractor shall have shop drawings showing the position and details of the inlets and outlets, and the details of the sealing of the tendon anchorages. The specialist contractor shall keep available on site documented records of:  materials and grout used;  initial type testing according to EN 447;  suitability testing according to this European standard;  results of the project specific grouting tests, if specified. The specialist contractor shall keep documented records of the conformity of the materials, equipment, grout, grouting operations, and inspection with this standard and the execution specification according to Table 2, Table 3 and Table 4. These records shall be kept for the duration, as required by national provisions. Any eventual corrective actions taken shall also be recorded. If special documentation beyond the requirements of this European standard is required for grouting works, the type and extent of the documentation shall be stated in the execution specification. 5 Materials The individual materials and the grout to be used shall comply with EN 447.



EN 446:2007 (E) 8 6 Grout assessment 6.1 Suitability testing The suitability of the grout shall be assessed for each project sufficiently in advance of grouting operations, to enable any necessary adjustments to be made in the use of the materials, equipment or personnel. The extent of suitability testing and number of tests shall be in accordance with Table 1.
Suitability testing may be waived for structures in Inspection Class 2 subject to there being documented testing during production in accordance with EN 447. Table 1 – Extent of suitability testing
Test in accordance with EN 445 2) Suitability testing Number of tests Sieve 9999 1 test Fluidity
9999 1 test immediately after mixing
2 tests 30 min after mixing Inclined tube Only required if not already subject to initial type testing with the same type of mixer intended to be used on the project 1 test if required Wick-induced bleed 1) 9999 3 tests Volume change 1) 9999 3 tests Compressive strength 9999 3 tests Density 9999 1 test 1) Tests for bleeding and volume change are performed on the same sample. 2)
Other test methods may be used if the correlation or safe relationship between the results of these test methods and the reference methods in EN 445 have been established.
The grout assessment shall consist of the preparation of the grout using the materials, equipment and personnel proposed for the project, and testing in accordance with EN 445. The preparation of the grout shall be carried out under the conditions expected on site for the project. The assessed grout properties shall comply with EN 447. The range of acceptable temperatures specified for the particular grout shall be compatible with the expected conditions of the project. 6.2 Project specific grouting tests If required by the execution specification, project specific grouting tests on tendons in representative forms of the project shall be performed.
NOTE Such tests should be planned and carried out well in advance of the site operations. Such project specific grouting tests may be advisable, e.g. when tendon geometry and details are specified on the project for which no prior experience for successful grouting is available. Experience has shown that full-scale tests of grout and grouting procedures can be valuable to prove adequacy.



EN 446:2007 (E) 9 7 Equipment 7.1 General Grouting equipment shall consist of a mixer and a pump with all the necessary connection hoses, valves, measuring devices for water, cement, admixtures and additions and testing equipment as required to perform the grouting of the project.
The grouting equipment shall be such that the ducts can be filled without interruption and at the anticipated speed.
Grouting equipment shall include a storage reservoir if required for continuous filling of the tendons on the project. Such storage reservoirs shall have an agitator to keep the grout moving continually before it is pumped into the ducts. The grouting equipment shall be compatible with the post-tensioning kit provided for the project. 7.2 Mixer The mixing equipment shall be capable of producing grout, which possesses an even distribution of cement, and an even dispersal of admixtures, additions,
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