SIST EN 12225:2021
(Main)Geosynthetics - Method for determining the microbiological resistance by a soil burial test
Geosynthetics - Method for determining the microbiological resistance by a soil burial test
This document specifies a method for the determination of the microbiological resistance of geosynthetics including those of natural fibres and biodegradable polymers by a soil burial test.
NOTE Experience and exhumation of geosynthetics which had performed successfully, in some cases for more than two decades, indicate that geosynthetics made out of synthetic materials are generally resistant against microbial initiated decay. It can therefore be expected that most of these products commercially available at the present time will pass the soil burial test successfully and it is probably not necessary to submit them all to this test independent of their function. However, if the requirements for appropriate functioning of the geosynthetics demand proof of microbiological resistance or if they are manufactured from newly developed polymers whose resistance is in any doubt, the soil burial test can provide additional information.
Geokunststoffe - Prüfverfahren zur Bestimmung der mikrobiologischen Beständigkeit durch einen Erdeingrabungsversuch
Dieses Dokument legt ein Verfahren zur Bestimmung der mikrobiologischen Beständigkeit von Geokunststoffen, einschließlich denen, die aus Naturfasern und biologisch abbaubaren Polymeren bestehen, durch einen Erdeingrabungsversuch fest.
ANMERKUNG Erfahrungen und die Ausgrabung von Geokunststoffen, die sich in manchen Fällen über mehr als zwei Jahrzehnte als beständig erwiesen haben, zeigen, dass Geokunststoffe aus synthetischen Materialien im Allgemeinen gegenüber mikrobiologisch ausgelöstem Zerfall resistent sind. Es kann deshalb erwartet werden, dass die meisten der gegenwärtigen handelsüblichen Produkte den Erdeingrabungsversuch erfolgreich bestehen werden und dass es wahrscheinlich nicht notwendig ist, sie alle unabhängig von ihrer Funktion dieser Prüfung zu unterziehen. Wenn jedoch die Anforderungen an ausreichende Funktion der Geokunststoffe den Nachweis der mikrobiologischen Beständigkeit erfordern oder wenn sie aus neuentwickelten Polymeren hergestellt sind, deren Beständigkeit anzuzweifeln ist, kann der Erdeingrabungsversuch zusätzliche Informationen liefern.
Géosynthetics - Méthode pour la détermination de la résistance microbiologique par un essai d'enfouissement
Ce document présente une méthode de détermination de la résistance microbiologique des
géosynthétiques incluant ceux constitués de fibres naturelles et de polymères biodégradables par un
essai d'enfouissement dans le sol.
NOTE L'expérience sur des géosynthétiques extraits après un enfouissement, pouvant dans certains cas
dépasser 20 ans, a montré que les produits composés de matières plastiques sont en général résistants à une
dégradation microbienne amorcée. On peut par conséquent s'attendre à ce que la plupart des produits actuellement
disponibles sur le marché obtiennent un résultat positif à l'essai d'enfouissement ; il ne sera probablement pas
nécessaire de les soumettre tous, indépendamment de leur fonction à laquelle ils sont destinés, à cet essai.
Cependant, si les exigences relatives à un emploi adéquat des produits concernés nécessitent de démontrer leur
résistance microbiologique, ou, s'ils ont été fabriqués à partir de polymères récemment mis au point pour lesquels
la résistance microbiologique n'a pas été établie, il convient d'effectuer l'essai d'enfouissement.
Geosintetika - Metoda ugotavljanja mikrobiološke odpornosti s preskusom zakopavanja v zemljo
General Information
Relations
Overview
EN 12225:2020 (CEN) - "Geosynthetics - Method for determining the microbiological resistance by a soil burial test" - specifies a laboratory soil burial method to assess the microbiological resistance of geosynthetics, including products made from natural fibres and biodegradable polymers. The standard defines test soil preparation, incubation climate, specimen handling, cleaning, and tensile evaluation to determine whether a geosynthetic shows microbiologically induced degradation under controlled, biologically active soil conditions.
Key topics and technical requirements
- Scope: Evaluates microbiological attack by bacteria and fungi on geosynthetics; intended for cases where proof of resistance is required or for new polymers.
- Test specimen and sampling:
- Five tensile specimens per direction (machine and cross-machine) and per condition.
- Control specimens stored in standard atmosphere (EN ISO 291: 23 ±1 °C, 50 ±5 % RH).
- Test soil and biological activity:
- Natural soil, sieved to remove particles >4 mm; moisture set to (60 ± 5) % of the soil’s SMC (saturation moisture content).
- Soil acclimatisation: at least 28 days at ≥90 % RH and ≈28 °C (or 56 days at ≈26 °C) to establish microbial activity.
- Biological activity check: buried cotton strips (100 × 25 mm, ~230 g/m²) must lose tensile strength to ≤25 % of original after 7 days.
- Incubation conditions:
- Specimens buried 100–150 mm deep; container allows air exchange.
- Ambient test climate: ~26 ±1 °C with gaseous-phase RH ≥90 % for the container above the soil.
- Standard test duration: 16 weeks (index); extended tests up to 32 weeks may be used during product development.
- Cleaning and evaluation:
- After exposure, clean specimens in ethanol-water (70:30) for 300 s, rinse, and dry 72 h in standard atmosphere (unless a product is sensitive to washing-then wipe and dry).
- Tensile tests performed per EN 12226 and EN ISO 13934-1 (modified clamp distance 50 mm) and compared to controls.
- Reporting: Include reference to EN 12225, test date, sample ID, soil type, soil preparation, test conditions, and results.
Applications and users
EN 12225:2020 is used by:
- Geosynthetic manufacturers validating microbiological durability of new polymers or natural-fibre products
- Independent testing laboratories performing standardized soil-burial assessments
- Geotechnical and civil engineers specifying materials for long-term soil-contact applications (landfills, erosion control, drainage, reinforcement)
- Procurement and conformity bodies requiring documented resistance to microbial degradation
Use this method when biological decay could affect material function or when regulatory/contractual proof of microbiological resistance is required.
Related standards
- EN 12226 - General tests for evaluation following durability testing
- EN ISO 11721-1 - Soil burial test for cellulose-containing textiles
- EN ISO 13934-1 - Tensile properties of fabrics (strip method)
- EN ISO 291 - Standard atmospheres for conditioning and testing
Keywords: EN 12225:2020, geosynthetics, microbiological resistance, soil burial test, geotextiles, biodegradable polymers, CEN.
Frequently Asked Questions
SIST EN 12225:2021 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Geosynthetics - Method for determining the microbiological resistance by a soil burial test". This standard covers: This document specifies a method for the determination of the microbiological resistance of geosynthetics including those of natural fibres and biodegradable polymers by a soil burial test. NOTE Experience and exhumation of geosynthetics which had performed successfully, in some cases for more than two decades, indicate that geosynthetics made out of synthetic materials are generally resistant against microbial initiated decay. It can therefore be expected that most of these products commercially available at the present time will pass the soil burial test successfully and it is probably not necessary to submit them all to this test independent of their function. However, if the requirements for appropriate functioning of the geosynthetics demand proof of microbiological resistance or if they are manufactured from newly developed polymers whose resistance is in any doubt, the soil burial test can provide additional information.
This document specifies a method for the determination of the microbiological resistance of geosynthetics including those of natural fibres and biodegradable polymers by a soil burial test. NOTE Experience and exhumation of geosynthetics which had performed successfully, in some cases for more than two decades, indicate that geosynthetics made out of synthetic materials are generally resistant against microbial initiated decay. It can therefore be expected that most of these products commercially available at the present time will pass the soil burial test successfully and it is probably not necessary to submit them all to this test independent of their function. However, if the requirements for appropriate functioning of the geosynthetics demand proof of microbiological resistance or if they are manufactured from newly developed polymers whose resistance is in any doubt, the soil burial test can provide additional information.
SIST EN 12225:2021 is classified under the following ICS (International Classification for Standards) categories: 07.100.99 - Other standards related to microbiology; 59.080.70 - Geotextiles. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 12225:2021 has the following relationships with other standards: It is inter standard links to SIST EN 12225:2001. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN 12225:2021 is associated with the following European legislation: EU Directives/Regulations: 305/2011. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
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Standards Content (Sample)
SLOVENSKI STANDARD
01-januar-2021
Nadomešča:
SIST EN 12225:2001
Geosintetika - Metoda ugotavljanja mikrobiološke odpornosti s preskusom
zakopavanja v zemljo
Geosynthetics - Method for determining the microbiological resistance by a soil burial
test
Geokunststoffe - Prüfverfahren zur Bestimmung der mikrobiologischen Beständigkeit
durch einen Erdeingrabungsversuch
Géosynthetics - Méthode pour la détermination de la résistance microbiologique par un
essai d'enfouissement
Ta slovenski standard je istoveten z: EN 12225:2020
ICS:
07.100.99 Drugi standardi v zvezi z Other standards related to
mikrobiologijo microbiology
59.080.70 Geotekstilije Geotextiles
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 12225
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2020
EUROPÄISCHE NORM
ICS 59.080.70; 07.100.99 Supersedes EN 12225:2000
English Version
Geosynthetics - Method for determining the
microbiological resistance by a soil burial test
Géosynthétiques - Méthode de détermination de la Geokunststoffe - Prüfverfahren zur Bestimmung der
résistance microbiologique par un test mikrobiologischen Beständigkeit durch einen
d'enfouissement dans le sol Erdeingrabungsversuch
This European Standard was approved by CEN on 11 October 2020.
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-CENELEC 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-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12225:2020 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Principle . 5
5 Reagents and apparatus . 5
5.1 Test soil . 5
5.2 Cotton fabric . 6
5.3 Microbicides . 6
5.4 Container . 6
6 Specimens . 6
7 Test climate . 6
8 Procedure. 6
8.1 Biological activity . 6
8.2 Testing of specimens . 7
8.2.1 Active test . 7
8.2.2 Incubation . 7
8.2.3 Cleaning of specimens . 7
8.2.4 Evaluation of tests . 7
9 Test report . 8
European foreword
This document (EN 12225:2020) has been prepared by Technical Committee CEN/TC 189
“Geosynthetics”, the secretariat of which is held by NBN.
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 May 2021, and conflicting national standards shall be
withdrawn at the latest by May 2021.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 12225:2000.
Compared with EN 12225:2000 the following modifications have been made:
— revision of the entire document and adaptation to the current rules of structuring and drafting;
— revision of the normative references in the entire document and Clause 2;
— references to the terminological databases of ISO and IEC included in Clause 3;
— the bibliography has 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, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
1 Scope
This document specifies a method for the determination of the microbiological resistance of
geosynthetics including those of natural fibres and biodegradable polymers by a soil burial test.
NOTE Experience and exhumation of geosynthetics which had performed successfully, in some cases for
more than two decades, indicate that geosynthetics made out of synthetic materials are generally resistant against
microbial initiated decay. It can therefore be expected that most of these products commercially available at the
present time will pass the soil burial test successfully and it is probably not necessary to submit them all to this
test independent of their function. However, if the requirements for appropriate functioning of the geosynthetics
demand proof of microbiological resistance or if they are manufactured from newly developed polymers whose
resistance is in any doubt, the soil burial test can provide additional information.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 12226, Geosynthetics — General tests for evaluation following durability testing
EN ISO 291, Plastics — Standard atmospheres for conditioning and testing (ISO 291)
EN ISO 11721-1:2001, Textiles — Determination of the resistance of cellulose-containing textiles to micro-
organisms — Soil burial test — Part 1: Assessment of rot-retardant finishing (ISO 11721-1:2001)
EN ISO 13934-1, Textiles — Tensile properties of fabrics — Part 1: Determination of maximum force and
elongation at maximum force using the strip method (ISO 13934-1)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Elec
...
SIST EN 12225:2021 표준은 지오합성재의 미생물 저항성을 평가하는 방법을 규정하고 있으며, 주로 자연 섬유와 생분해성 폴리머로 구성된 지오합성재에 적용됩니다. 이 표준의 주요 범위는 흙 매립 시험을 통해 이러한 재료의 미생물 저항성을 결정하는 방법을 명확히 제시하는 것으로, 이는 지오합성재의 기능적 신뢰성을 보장하는 데 필수적입니다. SIST EN 12225:2021의 강점 중 하나는 오랜 기간 동안 성공적으로 사용된 지오합성재(때로는 20년 이상)의 경험을 바탕으로, 합성 재료로 제작된 지오합성재가 일반적으로 미생물에 의한 부패에 저항력이 있다는 것을 입증하고 있다는 점입니다. 이에 따라, 현재 상업적으로 판매되는 많은 제품들이 흙 매립 시험을 통과할 것으로 예상되며, 이 시험을 모든 제품에 반드시 적용할 필요는 없다고 언급하고 있습니다. 또한, 표준은 지오합성재의 적절한 기능을 위해 미생물 저항성이 요구되는 경우 또는 새로운 폴리머로 제조된 제품의 저항성이 의심스러운 경우에 흙 매립 시험이 추가 정보를 제공할 수 있음을 강조합니다. 이러한 점에서 SIST EN 12225:2021은 지오합성재 산업에 있어서 매우 중요한 표준으로 자리 잡고 있으며, 미생물 저항성을 평가할 수 있는 명확하고 실용적인 방법론을 제공함으로써 해당 분야의 신뢰성을 한층 높이고 있습니다. 결론적으로, SIST EN 12225:2021은 지오합성재의 미생물 저항성을 검증하는 중요한 방법으로서, 산업 내에서 그 적합성과 신뢰도를 강화하는 역할을 합니다. 이 표준의 준수는 제품 개발과 품질 보증에 있어서 필수적이며, 미생물의 영향을 최소화함으로써 지오합성재의 지속 가능성을 높이는 데 기여합니다.
SIST EN 12225:2021は、地盤埋蔵試験によるジオシンセティックスの微生物耐性を測定するための方法を規定する重要な規格です。この文書は、天然繊維や生分解性ポリマーを含むジオシンセティックスの微生物耐性を評価するための手法を明確に示しており、従来の合成材料から製造された製品が一般的に微生物による劣化に対して耐性があることを示唆しています。 この規格の強みは、土壌埋蔵試験を通じて得られる実践的な認識にあります。例えば、20年以上にわたり成功裏に機能してきたジオシンセティックスの経験に基づき、現在市場に出回っている多くの製品は、特別な試験なしにこの試験を通過することが期待されます。これは、業界における信頼性向上につながるものであり、製品開発の効率を高める要素となるでしょう。 さらに、この文書は特定の機能要件が微生物耐性の証明を要求する場合や、新しく開発されたポリマーが耐性に疑問を持つ場合に、土壌埋蔵試験が追加情報を提供する手段として有効であることを指摘しています。これにより、ジオシンセティックスの微生物耐性に関する評価が一層明確になると共に、環境への影響を考慮した製品選定が可能となります。 総じて、SIST EN 12225:2021は、ジオシンセティックスの微生物耐性を保証するための基準を提供する重要な文書であり、関連業界における製品の選定や開発において、非常に関連性の高い規格です。
The SIST EN 12225:2021 standard presents a comprehensive framework for evaluating the microbiological resistance of geosynthetics through a soil burial test. The scope of this standard encompasses various geosynthetics, including those made from natural fibers and biodegradable polymers, thus providing a valuable tool for manufacturers and stakeholders in assessing the durability and longevity of their products in real-world applications. One of the notable strengths of the SIST EN 12225:2021 is its empirical basis, grounded in decades of experience with geosynthetics and evidence that synthetic materials tend to exhibit a high level of resistance to microbial-induced decay. This historical insight assures users that many commercially available geosynthetics are likely to pass the soil burial test without issue, reducing unnecessary testing for widely used products. Additionally, the standard emphasizes the importance of microbiological resistance when new polymers are developed or when specific functional demands require verification of material resilience. This aspect is crucial as it provides a clear pathway for innovation while ensuring compliance with relevant performance criteria. The relevance of the SIST EN 12225:2021 lies in its alignment with growing environmental and performance standards in the geosynthetics industry. As businesses increasingly seek to utilize eco-friendly materials, the inclusion of biodegradable options within the standard demonstrates a forward-thinking approach to sustainability. Overall, the SIST EN 12225:2021 serves as an essential reference for the assessment of geosynthetic materials, balancing the need for rigorous testing with practical considerations for manufacturers and end-users. Its thorough methodology and consideration of both synthetic and biodegradable materials solidify its status as a key standard in promoting microbiological resistance in geotechnical applications.
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