EN 13491:2018

Geosynthetic barriers - Characteristics required for use in the construction of tunnels and associated underground structures

This document specifies the characteristics of geosynthetic barriers, including polymeric geosynthetic barriers, clay geosynthetic barriers and bituminous geosynthetic barriers, when used as fluid barriers and separation layer in the construction of tunnels and associated underground structures, and the appropriate test methods to determine these characteristics.
The intended use of these products is to control the leakage of fluid through the construction.
This document is not applicable to geotextiles or geotextile-related products as defined in EN ISO 10318 1.
This document provides for the assessment and verification of constancy of performance (AVCP) of the product to this European Standard including factory production control procedures.
This document defines characteristics to be considered with regard to the presentation of performance.
This document does not cover applications where the geosynthetic barrier is to be in contact with water that has been treated for human consumption.
NOTE   Where potable water is or can be in direct contact with the product, other relevant standards, requirements and/or regulations can be considered for the design.

Geosynthetische Dichtungsbahnen - Eigenschaften, die für die Anwendung beim Bau von Tunneln und damit verbundenen Tiefbauwerken erforderlich sind

Dieses Dokument legt die Eigenschaften von geosynthetischen Dichtungsbahnen, einschließlich geosynthetische Kunststoff-, Ton- und Bitumendichtungsbahnen, die als Abdichtung und Trennschicht beim Bau von Tunneln und damit verbundenen Tiefbauwerken verwendet werden, und die geeigneten Prüfverfahren zur Bestimmung dieser Eigenschaften fest.
Die bestimmungsgemäße Anwendung dieser Produkte ist das Durchsickern von Flüssigkeiten durch das Bauwerk zu kontrollieren.
Dieses Dokument ist nicht anwendbar auf Geotextilien oder geotextilverwandte Produkte im Sinne der Definition von EN ISO 10318 1.
Dieses Dokument behandelt die Bewertung und Überprüfung der Leistungsbeständigkeit (AVCP) des Produkts nach dieser Europäischen Norm, einschließlich der Verfahren für die werkseigene Produktions-kontrolle.
Dieses Dokument legt die Eigenschaften fest, die in Bezug auf die Darstellung der Leistung eingehalten werden müssen.
Dieses Dokument umfasst nicht die Anwendungen, bei denen die geosynthetische Dichtungsbahn in Kontakt mit Trinkwasser kommt, das für den unmittelbaren menschlichen Gebrauch behandelt wurde.
ANMERKUNG   Wo Trinkwasser in direkten Kontakt mit dem Produkt kommt oder kommen kann, können einschlägige Normen, Anforderungen und/oder Bestimmungen bei der Planung berücksichtig werden.

Géomembranes et géosynthétiques bentonitiques - Caractéristiques requises pour l'utilisation dans la construction de tunnels et des structures souterraines associées

Le présent document spécifie les caractéristiques applicables aux géosynthétiques d'étanchéité incluant les géomembranes polymériques, les géosynthétiques bentonitiques et les géomembranes bitumineuses utilisés comme barrière aux fluides ou couche de séparation dans la construction des tunnels et des structures souterraines associées, ainsi que les méthodes d'essai appropriées pour déterminer ces caractéristiques.
Ces produits sont destinés à contrôler les fuites de fluides à travers la construction.
Le présent document ne s'applique pas aux géotextiles ou produits apparentés, tels que définis dans l'EN ISO 10318-1.
Le présent document permet d'évaluer et de vérifier la constance des performances (AVCP) du produit à la présente Norme européenne et les procédures de contrôle de la production en usine.
Le présent document établit les caractéristiques à considérer au regard des performances à vérifier.
Le présent document ne couvre pas les applications pour lesquelles les géosynthétiques d’étanchéité sont en contact avec de l’eau potable ayant fait l’objet d’un traitement pour la consommation humaine.
NOTE   Si de l'eau potable est ou peut être en contact direct avec le produit, il convient que le concepteur se réfère également aux normes, exigences et/ou règlements applicables.

Geosintetične zapore - Zahtevane lastnosti pri uporabi za zaščito pred tekočinami pri gradnji predorov in pripadajočih podzemnih konstrukcij

Ta dokument določa ustrezne lastnosti geosintetičnih zapor, vključno s polimernimi, opečnati in bitumenskimi geosintetičnimi zaporami, če se uporabljajo za zaščito pred tekočinami pri gradnji predorov in podzemnih gradnjah, in ustrezne preskusne metode za določanje teh lastnosti. Ti proizvodi se predvidoma uporabljajo za nadzor uhajanja vode skozi steno konstrukcije. Ta dokument ne velja za geotekstilije ali sorodne izdelke. Ta dokument omogoča vrednotenje skladnosti izdelka s tem dokumentom. Ta dokument določa zahteve, ki jih morajo izpolniti proizvajalci in distributerji glede predstavitve lastnosti izdelka. Ta dokument ne zajema uporabe, kjer bodo geosintetične zapore v stiku s pitno vodo, ki je namenjena ljudem.  OPOMBA: Če je oz. bo lahko proizvod v stiku s pitno vodo, mora projektant upoštevati tudi druge ustrezne standarde, zahteve in/ali predpise.

General Information

• Status: Published
• Publication Date: 13-Mar-2018
• Withdrawal Date: 30-Dec-2019
• ICS: 59.080.70 - Geotextiles
• ICS: 91.100.50 - Binders. Sealing materials
• Technical Committee: CEN/TC 189 - Geotextiles and geotextile-related products
• Drafting Committee: CEN/TC 189/WG 6 - Geomembranes and geosynthetic clay liners - General and specific requirements
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 06-Oct-2023
• Completion Date: 14-Apr-2025
• Directive: 305/2011 - 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: 89/106/EEC - Construction products
• Mandate: M/107 - Mandate to CEN/CENELEC concerning the execution of standardization work for harmonized standards on geotextiles
• Ref Project: SIST EN 13491:2018 - Geosynthetic barriers - Characteristics required for use as a fluid barrier in the construction of tunnels and associated underground structures

Relations

• Replaces: EN 13491:2013 - Geosynthetic barriers - Characteristics required for use as a fluid barrier in the construction of tunnels and associated underground structures
• Effective Date: 21-Mar-2018

Overview

EN 13491:2018 (EN 13491) defines the required characteristics and test methods for geosynthetic barriers used as a fluid barrier and separation layer in the construction of tunnels and associated underground structures. It covers polymeric geosynthetic barriers, clay geosynthetic barriers and bituminous geosynthetic barriers intended to control leakage through tunnel linings and underground works. The standard also sets out procedures for assessment and verification of constancy of performance (AVCP) including factory production control (FPC).

Not applicable: geotextiles and geotextile‑related products as defined in EN ISO 10318‑1, and applications where the barrier is in direct contact with potable (treated) water.

Key topics and technical requirements

• Scope of use: Specifies intended use as a fluid-tight and separating layer in tunnels and related underground structures.
• Types of barriers: Polymeric (geomembranes), clay geosynthetic barriers (bentonitic), and bituminous geosynthetic barriers.
• Performance characteristics: Declared characteristics relevant to leakage control (e.g., permeability, tensile and puncture resistance, dimensional and thermal properties) and characteristics relevant to specific site conditions.
• Test methods: References standardized test methods for permeability, tensile properties, burst strength, mass/thickness, durability and chemical/root resistance (examples include EN 14150, EN 14151, EN ISO 10319, EN 14196 and EN 16416 among others).
• Durability: Annex A addresses long‑term behavior and accelerated ageing-weathering, oxidation, freezing/thawing and wetting/drying effects-relevant to design life (temporary vs permanent installations).
• Conformity and AVCP: Procedures for type testing and factory production control to demonstrate constancy of performance in line with EU requirements (see informative Annex ZA regarding Regulation (EU) No. 305/2011).

Practical applications and users

Who uses EN 13491:

• Manufacturers of geomembranes, bentonite geosynthetic liners and bituminous barrier sheets for product specification and CE marking.
• Designers and tunnel engineers selecting barrier systems for groundwater control, seepage management and separation layers in tunnels, shafts and underground structures.
• Contractors and specifiers writing procurement documents and acceptance criteria.
• Testing laboratories performing the referenced standardized tests to evaluate declared performance.
• Certification bodies and authorities verifying AVCP and FPC documentation.

Practical benefits:

• Ensures consistent, test‑based performance declarations for leakage control.
• Supports selection of appropriate barrier type and durability expectations for design life.
• Aligns product conformity assessment with European regulatory frameworks.

Related standards (examples referenced)

• EN 14150 - Geosynthetic barriers: permeability to liquids
• EN 14151 - Determination of burst strength
• EN 16416 - Geosynthetic clay barriers: water flux index
• EN ISO 10319 / EN ISO 527 - Tensile testing of geosynthetics and plastics
• EN ISO 10318‑1 - Terms and definitions (geosynthetics)

Keywords: EN 13491, geosynthetic barriers, geomembrane, geosynthetic clay barrier, bituminous geosynthetic barrier, tunnel waterproofing, fluid barrier, AVCP, factory production control, permeability, durability.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Geosynthetische Dichtungsbahnen - Eigenschaften, die für die Anwendung beim Bau von Tunneln und damit verbundenen Tiefbauwerken erforderlich sindBarrières géosynthétiques - Caractéristiques requises pour l'utilisation comme barrière contre les liquides dans la construction des tunnels et des structures souterrainesGeosynthetic barriers - Characteristics required for use as a fluid barrier in the construction of tunnels and associated underground structures93.060Gradnja predorovTunnel construction59.080.70GeotekstilijeGeotextilesICS:Ta slovenski standard je istoveten z:EN 13491:2018SIST EN 13491:2018en,fr,de01-maj-2018SIST EN 13491:2018SLOVENSKI
STANDARDSIST EN 13491:20131DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 13491
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s u v { sã t r s uEnglish Version
Geosynthetic barriers æ Characteristics required for use in the construction of tunnels and associated underground structures Géomembranes et géosynthétiques bentonitiques æ Caractéristiques requises pour l 5utilisation dans la construction de tunnels et des structures souterraines associées
Geosynthetische Dichtungsbahnen æ Eigenschaftená die für die Anwendung beim Bau von Tunneln und damit verbundenen Tiefbauwerken erforderlich sind This European Standard was approved by CEN on
t u October
t r s yä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Serbiaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Rue de la Science 23,
B-1040 Brussels
t r s z CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
s u v { sã t r s z ESIST EN 13491:2018

European foreword . 3 Introduction . 4 1 Scope . 5 2 Normative references . 5 3 Terms, definitions and abbreviations . 8 3.1 Terms and definitions . 8 3.2 Abbreviations . 9 4 Characteristics and corresponding methods of test . 10 4.1 General . 10 4.2 Types of application . 10 4.3 Relevant characteristics . 14 4.4 Characteristics relevant to specific conditions of use . 20 4.5 Release of dangerous substances . 21 5 Assessment and verification of constancy of performance (AVCP) . 21 5.1 General . 21 5.2 Type testing . 21 5.3 Factory production control (FPC) . 25 Annex A (normative)
Durability of geosynthetic barriers . 33 A.1 General . 33 A.2 Weathering . 34 A.3 Products used with a service life up to 5 years . 36 A.4 Other applications and service life of 25 and 50 years . 36 A.5 Durability tests on GBR-P . 42 A.6 Evaluation tests on GBR-P and GBR-C . 50 A.7 Durability tests on GBR-B . 51 A.8 Evaluation tests on GBR-B . 55 Annex ZA (informative)
Relationship of this European Standard with Regulation (EU) No. 305/2011 . 57 ZA.1 Scope and relevant characteristics . 57 ZA.2 System of Assessment and Verification of Constancy of Performance (AVCP) . 58 ZA.3 Assignment of AVCP tasks . 59 Bibliography . 61
The list of normative references has been updated;
In 3.1 three terms have been added;
In 3.2 list of abbreviations has been updated;
In 4.3, Table 1, has been modified to comply with the modified mandate M/386 (inclusion of elongation in separation and filtration functions) and has been technically revised, all H-coded characteristics have been replaced by “A”;
Figures and keys have been revised;
Clause 5 “Evaluation of conformity” has been superseded by new Clause 5 “Assessment and verification of constancy of performance (AVCP)”;
Annex A “Factory production control – Factory production control scheme” has been deleted;
Former Annex B “Durability” becomes Annex A, which has been totally revised;
Annex ZA has been updated according to new template to fulfil requirements of CPR, also examples for CE-marking have been deleted. According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 13491:2018

preferably standardized
test methods, if they are technically relevant and not conflicting with European Standards. The design life of the product should be determined, since its function can be temporary, as construction expediency, or permanent, for the lifetime of the structure. SIST EN 13491:2018

¯ y v °C and 30 °C ASTM D1434, Standard Test Method for Determining Gas Permeability Characteristics of Plastic Film and Sheeting ASTM D4603, Standard Test Method for Determining Inherent Viscosity of Poly(Ethylene Terephthalate) (PET) by Glass Capillary Viscometer
ASTM D5890, Standard test method for swell index of clay mineral component of geosynthetic clay liners ASTM D7409, Standard Test Method for Carboxyl End Group Content of Polyethylene Terephthalate (PET) Yarns 3 Terms, definitions and abbreviations 3.1 Terms and definitions For the purposes of this document, the terms and definitions given in EN ISO 10318-1 and the following apply. 3.1.1 product geosynthetic barrier, including polymeric, bituminous and clay barriers 3.1.2 geosynthetic barrier barrier with at least one of whose components is made from a synthetic or natural polymer, in the form of a sheet, a strip or a three dimensional structure, used in contact with soil and/or other materials in geotechnical and civil engineering applications 3.1.3 project specification document in which the works, functions, specific conditions and required material property values of the geosynthetic barrier are described 3.1.4 underground structure constructed void below ground which belongs to the tunnel construction 3.1.5 tunnel underground passageway, completely enclosed except for openings for entrance and exit, commonly at each end 3.1.6 moisture barrier barrier used to prevent the ingress of liquids and water vapours, without external hydrostatic pressure, to a tunnel or underground structure SIST EN 13491:2018

Key 1 soil or rock drilled tunnel 2 Shotcrete (optional) 3 protection/drainage geosynthetic (optional) 4 geosynthetic barrier 5 concrete (optional with protection geosynthetic layer) Figure 1 — Geosynthetic barrier in a drilled seepage water tunnel SIST EN 13491:2018

Key 1 rock 2 shotcrete 3 protection/drainage geosynthetic (optional) 4 geosynthetic barrier 5 concrete Figure 2 —Geosynthetic barrier in a drilled pressurized water tunnel SIST EN 13491:2018

Key 1 soil 2 concrete (optional) 3 protection/drainage geosynthetic (optional) 4 geosynthetic barrier 5 concrete (optional with protection geosynthetic layer) Figure 3 — Geosynthetic barrier in a cut and cover seepage water tunnel SIST EN 13491:2018

Key 1 soil 2 concrete (optional) 3 geosynthetic barrier 4 protection geosynthetic (optional) 5 concrete 6 protection/drainage geosynthetic (optional) Figure 4 — Geosynthetic barrier in a cut and cover pressurized water tunnel 4.3 Relevant characteristics The characteristics, their relevance to the conditions of use, and the test methods to be used, are specified in Table 1. The list of characteristics in Table 1 includes those relevant to all conditions of use (A) (essential characteristics are listed in Table ZA.1), and those relevant to specific conditions of use (S). The indication “–” means that the characteristic is not relevant for that function. Where, for the same property, data for more than one function shall be provided, the following ranking order shall be observed: A overrules S, and S overrules “–”. The functions and conditions of use, corresponding with the S-coded characteristics in Table 1, are specified in 4.4.The performances of characteristics shall be given on basis of the results of tests specified in this document and, where relevant, in accordance with 5.1. Information on how functioning joints can be made should be provided. Where products are jointed in the factory liquid tightness and if relevant the strength of the joints shall be tested and data presented. SIST EN 13491:2018

Geosynthetic barrier Test methods Remarks No Property to be testeda GBR-P GBR-B GBR-C GBR-P GBR-B GBR-C
Physical properties
1 Thickness A A — EN ISO 9863-1 EN 1849–1 — For products which cannot be tested according to EN ISO 9863-1, such as geotextile backed GBR-P, EN 1849–2 is applicable 2 Mass per unit area A A A EN 1849–2 EN 1849–1 EN 14196
Hydraulic properties
3 Liquid tightness A A A EN 14150 EN 14150 EN 16416 Test liquid is water. Report value index flux for GBR-C and permeability for GBR-P and GBR-B. 4 Swell Index — — A — — ASTM D5890
5 Gas permeability S S S ASTM D1434 ASTM D1434 EN ISO 10773
Mechanical properties
Geosynthetic barrier Test methods Remarks No Property to be testeda GBR-P GBR-B GBR-C GBR-P GBR-B GBR-C
6 Tensile strength A A A PE-HD and PE-LLD EN ISO 527-3, specimen type 5 FPO, PVC-P homogenous EN ISO 527-3, specimen type 5 (reference test method) equivalent to EN 12311–2, method B FPO, PVC-P multicomponent EN 12311–2 method A (reference test method) equivalent to EN ISO 527-4; specimen type 2; width: 50 mm,
EPDM homogenous EN 12311–2, method B EPDM multicomponent EN 12311–2, method A EN 12311–1 EN ISO 10319 PE-HD and PE-LLD v = 100 mm/min Tensile stress at break in N/mm2 to be reported FPO, PVC-P homogenous v = 100 mm/min if elongation at break is > 400 % the test speed is 500 mm/min maximum tensile strength in N/mm2 to be reported FPO, PVC-P multicomponent v = 100 mm/min maximum tensile force in N/50 mm to be reported EPDM homogenous v = 100 mm/min if elongation at break is > 400 % the test speed is 500 mm/min maximum tensile strength in N/mm2 to be reported EPDM multicomponent v = 100 mm/min max tensile force in N/50 mm to be reported SIST EN 13491:2018

Geosynthetic barrier Test methods Remarks No Property to be testeda GBR-P GBR-B GBR-C GBR-P GBR-B GBR-C
7 Elongation A A A PE-HD and PE-LLD EN ISO 527-3, specimen type 5 FPO, PVC-P homogenous EN ISO 527-3, specimen type 5 (reference test method)equivalent to EN 12311–2, method B FPO, PVC-P multicomponent EN 12311–2 method A (reference test method)equivalent to EN ISO 527-4; specimen type 2;
width: 50 mm EPDM homogenous EN 12311–2, method B EPDM multicomponent EN 12311–2, method A
EN 12311–1 EN ISO 10319 PE-HD and PE-LLD with reference length
(l0)50 mm,
v = 100 mm/min Elongation at break to be reported FPO, PVC-P homogenous v = 100 mm/min if elongation at break is > 400 % the test speed is 500 mm/min – Elongation at break to be reported FPO, PVC-P multicomponent v = 100 mm/min Elongation at maximum tensile force
in % to be reported EPDM homogenous v = 100 mm/min if elongation at break is > 400 % the test speed is 500 mm/min Elongation at break to be reported EPDM multicomponent v = 100 mm/min Elongation at maximum tensile force
in % to be reported 8 Static puncture A A A EN ISO 12236 EN ISO 12236 EN ISO 12236
9 Burst strength and elongation S S S EN 14151 EN 14151 EN 14151 This test applies to GBR-C only if they contain a polymeric or bituminous barrier element. 10 Tear strength S S — ISO 34-1 EN 12310–1 — For GBR-P use ISO 34-1:2015, method B, angle specimen (Figure 2) without nick at a speed of 50 mm/min. SIST EN 13491:2018

Geosynthetic barrier Test methods Remarks No Property to be testeda GBR-P GBR-B GBR-C GBR-P GBR-B GBR-C
Thermal properties
11 Low temperature behaviour (flexure) S S — EN 495–5 EN 1109 —
12 Thermal expansion A —
ASTM D696 — —
Durability
13 Weathering S S — EN 12224 EN 12224 — In accordance with Annex A. 14 Microorganisms S S S EN 12225 EN 12225 EN 12225 In accordance with Annex A. 15 Oxidation A A A EN 14575 EN 14575 EN ISO 13438 EN ISO 13438 is applicable for the geotextile elements and reinforcement yarns of GBR-C.
In accordance with Annex A. 16 Environmental stress cracking A — S EN 14576 — EN 14576 EN 14576 is applicable to GBR-P with a semi-crystalline structure. If GPR-P is greater 0,5 mm and less 1,0 mm the test EN 14576 shall be performed with the same composition at a thickness between 1,0 mm and 1,5 mm. In order to estimate exposure durability of thermoset elastomers, as semi-crystalline materials cannot be tested following the environmental stress cracking test (EN 14576), the ozone stress cracking test shall be performed according to EN 1844 and evaluated with tensile strength measurements of the reference and the exposed specimen in accordance with Annex B. In accordance with Annex A. SIST EN 13491:2018

Geosynthetic barrier Test methods Remarks No Property to be testeda GBR-P GBR-B GBR-C GBR-P GBR-B GBR-C
17 Chemical resistance S S S EN 14414 EN 14414 EN 14414 In accordance with Annex A. Chemical resistance testing should be conducted in line with site specific circumstances. This should be restricted to a consideration of the substrate onto which the material is laid and/or chemicals contained. 18 Wetting/drying — — S — — CEN/TS 14417 In accordance with Annex A. 19 Freezing/thawing — — S — — CEN/TS 14418 In accordance with Annex A. 20 Root penetration S S S CEN/TS 14416 CEN/TS 14416 CEN/TS 14416 In accordance with Annex A. 21 Reaction to fire A A A EN ISO 11925-2 EN ISO 11925-2 EN ISO 11925-2 GBR should be tested in metal frame only. In accordance with Annex A. a NOTE The 95 % confidence level corresponds to the mean value minus (and/or plus) a tolerance value (see Annex ZA, Table ZA.1 column Notes). Both the mean value and the tolerance value are defined by the manufacturer to be representative of the performance of the product for the corresponding characteristic (these two values are not necessarily based on a statistical calculation). Relevance of codes: A: relevant to all conditions of use S: relevant to specific conditions of use “—”: indicates that the characteristic is not relevant for that product. Particular site-specific application cases may contain requirements for additional properties and - preferably standardized - test methods, if they are technically relevant and not conflicting with European Standards. The design life of the product should be determined, since its function may be temporary, as construction expediency, or permanent, for the lifetime of the structure. SIST EN 13491:2018

for use in the construction of tunnels and associated underground structures design, in the raw material or in the supplier of the components, or in the method of production (subject to the definition of a product family), which would affect significantly one or more of the characteristics. Where components are used whose characteristics have already been determined, by the component manufacturer, on the basis of assessment methods of other product standards, these characteristics need not be re-assessed. The specifications of these components shall be documented. Products bearing regulatory marking in accordance with appropriate harmonized European specifications may be presumed to have the performances declared in the DoP, although this does not replace the responsibility on geosynthetic barriers,
for use in the construction of tunnels and associated underground structures manufacturer to ensure that the geosynthetic barriers for use in the construction of tunnels and associated underground structures as a whole is correctly manufactured and its component products have the declared performance values. 5.2.2 Test samples, testing and compliance criteria The number of samples of geosynthetic barriers,
for use in the construction of tunnels and associated underground structures to be tested/assessed shall be in accordance with Table 2. SIST EN 13491:2018

(CBR test) 4.3, Table1 According to 4.3, Table 1 5 Not defined Liquid tightness (Water permeability respective water flux index) 4.3, Table 1 According to 4.3, Table 1 1 Not defined Elongation 4.3, Table 1 According to 4.3, Table 1 5 MD/5 CMD Not defined Durability 4.3, Table 1 and Annex A According to 4.3, Table 1 and Annex A See Annex A See Annex A 5.2.3 Test reports The results of the determination of the product type shall be documented in test reports. All test reports shall be retained by the manufacturer for at least 10 years after the last date of production of the geosynthetic barriers for use in the construction of tunnels and associated underground structures to which they relate. 5.2.4 Shared other party results A manufacturer may use the results of the product type determination (in consistency with this standard) obtained by someone else (e.g. by another manufacturer, as a common service to manufacturers, or by a product developer), to justify his own declaration of performance regarding a product that is manufactured according to the same design (e.g. dimensions) and with raw materials, constituents and manufacturing methods of the same kind, provided that: — the results are known to be valid for products with the same essential characteristics relevant for the product performance; — in addition to any information essential for confirming that the product has such same performances related to specific essential characteristics, the other party who has carried out the determination of the product type concerned or has had it carried out, has expressly accepted 1) to transmit to the manufacturer the results and the test report to be used for the latter’s product type determination, as well as information regarding production facilities and the production control process that can be taken into account for FPC; — the manufacturer using other party results accepts to remain responsible for the product having the declared performances and he also: a) ensures that the product has the same characteristics relevant for performance as the one that has been subjected to the determination of the product type, and that there are no significant
1) The formulation of such an agreement can be done by licence, contract, or any other type of written consent. SIST EN 13491:2018
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