EN 524-3:1997

• Abstract:

  This European Standard lays down the procedure for determining the flexibility of sheaths for prestressing tendons which comply with prEN 523.

• Status: Published
• Publication Date: 18-Mar-1997
• ICS: 77.140.75 - Steel pipes and tubes for specific use
• ICS: 91.080.40 - Concrete structures
• Technical Committee: CEN/TC 104 - Concrete ( performance, production, placing and compliance criteria )
• Drafting Committee: CEN/TC 104/WG 7 - Sheaths for prestressing tendons
• Current Stage: 9020 - Submission to 2 Year Review Enquiry - Review Enquiry
• Start Date: 15-Jul-2026
• Completion Date: 15-Jul-2026
• Directive: Harmonized Standard305/2011 - Regulation (eu) No 305/2011 of the European Parliament and of the Council of 9 march 2011 laying down harmonised conditions for the marketing of construction products and repealing council directive 89/106/eec
• Directive:

  ---

  Not Harmonized89/106/EEC - Construction products
• Mandate: M/115 - Mandate to CEN/CENELEC concerning the execution of standardization work for harmonized standards on reinforcing and prestress. steel for concrete
• Ref Project: SIST EN 524-3:1999 - Steel strip sheaths for prestressing tendons - Test methods - Part 3: To-and-fro bending test

• Referred By: EN 523:2003 - Steel strip sheaths for prestressing tendons - Terminology, requirements, quality control
• Effective Date: 28-Jan-2026
• Referred By: EN ISO 389-5:2006 - Acoustics - Reference zero for the calibration of audiometric equipment - Part 5: Reference equivalent threshold sound pressure levels for pure tones in the frequency range 8 kHz to 16 kHz (ISO 389-5:2006)
• Effective Date: 28-Jan-2026
• Referred By: EN ISO 389-6:2007 - Acoustics - Reference zero for the calibration of audiometric equipment - Part 6: Reference threshold of hearing for test signals of short duration (ISO 389-6:2007)
• Effective Date: 28-Jan-2026
• Referred By: EN ISO 389-8:2004 - Acoustics - Reference zero for the calibration of audiometric equipment - Part 8: Reference equivalent threshold sound pressure levels for pure tones and circumaural earphones (ISO 389-8:2004)
• Effective Date: 28-Jan-2026
• Referred By: EN ISO 389-9:2009 - Acoustics - Reference zero for the calibration of audiometric equipment - Part 9: Preferred test conditions for the determination of reference hearing threshold levels (ISO 389-9:2009)
• Effective Date: 28-Jan-2026

Overview

EN 524-3:1997 is a CEN European standard that defines a test method for assessing the flexibility of steel strip sheaths for prestressing tendons. Titled “Steel strip sheaths for prestressing tendons - Test methods - Part 3: To-and-fro bending test”, the standard lays down the procedural requirements used to determine how sheaths behave under repeated bending (to-and-fro motion). It applies to sheaths that comply with prEN 523 and is classified under ICS 77.140.75 (steel pipes and tubes for specific use) and 91.080.40 (concrete structures).

Key topics and requirements

The standard focuses on measurable characteristics and repeatable procedures rather than product design. Key technical topics include:

• To-and-fro bending test procedure: a defined method to subject steel strip sheaths to back-and-forth bending cycles to evaluate flexibility and mechanical performance.
• Flexibility assessment: criteria and observations used to determine whether a sheath maintains integrity and functional performance under bending stresses.
• Test setup and execution: requirements for preparing specimens, selecting test parameters, and carrying out the bending cycles (as specified in the standard).
• Acceptance and evaluation: guidelines on how to interpret test outcomes to judge compliance with prEN 523 requirements.
• Documented reporting: requirements for recording test conditions, results and any failures or deformations observed during testing.

Note: EN 524-3 establishes the method and reporting expectations; specific numeric limits, cycle counts or dimensional tolerances are referenced in the standard text and in the related product standard (prEN 523).

Applications

This standard is practical for anyone involved in the manufacture, testing, selection or specification of ducting and sheathing used with prestressing tendons in concrete structures:

• Manufacturers of steel strip sheaths - to validate product performance and demonstrate compliance with European test procedures.
• Third‑party testing laboratories - to perform standardized to-and-fro bending tests and generate reproducible test reports.
• Structural and prestressing engineers - to understand sheath flexibility characteristics when specifying tendon systems for bridges, buildings and other reinforced concrete works.
• Quality assurance and specification writers - to reference a harmonized method for acceptance testing in procurement and contract documents.

Related standards

• prEN 523 - product conformity standard referenced by EN 524-3 (sheath compliance).
• Other parts of the EN 524 test-method series (see CEN catalog) and national implementations (e.g., SIST EN 524-3:1999).

Keywords: EN 524-3, steel strip sheaths, prestressing tendons, to-and-fro bending test, flexibility test, CEN standard, test methods.

SLOVENSKI STANDARD
01-oktober-1999
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Steel strip sheaths for prestressing tendons - Test methods - Part 3: To-and-fro bending
test
Hüllrohre aus Bandstahl für Spannglieder - Prüfverfahren - Teil 3: Hin- und
Herbiegeversuch
Gaines en feuillard d'acier pour câbles de précontrainte - Méthodes d'essai - Partie 3:
Essai de flexion dans les deux sens
Ta slovenski standard je istoveten z: EN 524-3:1997
ICS:
77.140.75 Jeklene cevi in cevni profili Steel pipes and tubes for
za posebne namene specific u
...