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N Mark for structural concrete (EHE-08)
N Mark of quality for CONCRETE EHE-08

N Mark for structural concrete (EHE-08)

N Mark for structural concrete (EHE-08)

The N Mark for structural concrete EHE-08 certifies the product's conformity with the regulatory requirements established in the Code on Structural Concrete, EHE-08, as well as with voluntary requirements included in the same Code, which imply a superior level of quality

The N Mark for structural concrete EHE-08 is an Officially Recognised Standard by the Ministry of Public Works, in accordance with the EHE-08.

This recognition facilitates the on-site reception of concrete with the AENOR Mark, which significantly reduces the number of required tests and applies more advantageous requirements, as well as simplifying the technical and documentation management of the project management. In terms of planning, structural savings are made by reducing the safety coefficient in calculations. 

In addition, this certification scheme is accredited by the Spanish National Accreditation Body (ENAC) in accordance with UNE-EN-ISO/IEC 17065.​

Ready-mixed concrete used for residential properties with characteristic resistances between 20 and 100 N/mm2

Certified concrete products must be included in the scope of application of the Structural Concrete Instruction EHE-08.

AENOR, a conformity assessment company, is a leader in product certification. With more than 100,000 certified references, the AENOR​​ N Mark is present in over 40 countries and is among the top 5 product quality markings in the world. 

The AENOR N Mark is a voluntary marking that allows a company to demonstrate that its product complies with specific provisions compiled in a UNE, EN or ISO standard or in a technical specification. AENOR's robust inspection of the manufacturing processes and testing of end products allows licensees of the Mark to put products on the market with a high standard of quality, creating trust between the manufactures and the users of their certified products.​​​

The Code on Structural Concrete EHE-08, approved by Royal Decree 1247/2008, of 18 July, establishes a series of technical specifications that products and execution processes must meet. While voluntary, these certified products can boast quality markings that guarantee their compliance with standards, regulatory provisions or individual regulations from issuing agencies.

The AENOR N Mark bears the recognition of the Ministry of Public Works as an officially recognised logo under the EHE-08. Any product with the officially recognised logo is one with a level of guarantee higher than the minimum level required under EHE-08. The logo implies having undergone a rigorous product control during its manufacture; external verification with testing performed in independent laboratories accredited by ENAC, in accordance with the standard EN ISO 17025; audits and inspections of its facilities, raw materials and quality system. The companies that issue these certificates are accredited by ENAC in accordance with the standard EN ISO 17065 and are guaranteed by the Public Administration that handles official recognition (Royal Decree 1247/2008 approving the EHE-08).​

This way, the AENOR N Mark provides the following benefits:​​


The manufacturer

  • Better understanding of a product due to the exhaustive control the AENOR Mark establishes with respect to the same
  • Products that do not comply with relevant standards or regulations can be detected before they enter the market
  • Decreases production costs as a result of greater control during the manufacturing process
  • There are commercial grounds to introduce the product into new markets and facilitate access to works

Planners and builders

  • Streamlines the calculation and design of the structure
  • Favourable calculation criteria (lower safety coefficients for materials, small anchor lengths, etc.)
  • Before receiving the materials, it reduces the required documentary control and, in some cases, allows the company to avoid inspecting the raw materials, the manufacturer's facilities and the preliminary product testing
  • In the supply phase, it prevents the need for experimental verifications, removing all testing during on-site reception, representing significant savings when monitoring work quality

Technical management and ownership

  • Greater information on the products used on the work site and on their traceability, thus instilling greater confidence
  • Rigorous quality control at the factory
  • Simplified control programme
  • Savings on worksite control.
  • Accessibility to information from the factory control
  • Reduction of non-conforming products and associated costs
  • Quick intervention during incidences affecting product quality
  • Participation of an independent certification body and Public Administration


The AENOR Mark is voluntary. Companies that want AENOR to certify their product must submit their application in accordance with the formats established by AENOR. This application must include information about the company and the characteristics of the products for which certification is sought. In the case of concrete products, the certification is requested by “families” or groups of different designations of concrete with equivalent dosages.

Once the documentation has been analysed by AENOR technicians, the conformity assessment activities are commenced to verified that the products comply with current regulations:


A visit is made to the production centre to carry out the following procedures:

    • ​​​a) the quality management system is audited according to the requirements of UNE-EN ISO 9001 directly related to the production process. This part is not necessary if the company has the AENOR Company Register Certificate. 
    • b) the manufacturing process and production controls carried out by the manufacturer are inspected to ensure product compliance with the requirements of the standard.


The test laboratory, accredited by ENAC, takes samples for consistency and compression resistance testing, 5 samples/month for 2 months before granting the Mark.


The manufacturer records the data obtained from all the production control tests in a software application authorised by AENOR. AENOR has continual access to this information of the manufacturer. It is extremely important that there is very little deviation in the production, which requires an exhaustive control of raw materials and all involved parameters.

The Technical Certification Committee (an independent body formed by all involved parties: manufacturers, management, users, testing agencies, and AENOR) analyses the reports of the activities carried out by the company (without knowing which company it is) and recommends AENOR either to grant the Mark or to request certain activities to be repeated by the company due to failing to meet the requirements.

Once the certificate has been granted, the process continues with the follow-up activities required to maintain the Mark:

  • Annual audits of the quality management system are carried out in accordance with the requirements of UNE-EN ISO 9001, directly related to the production process.
  • Weekly inspections are made of the manufacturing process and the production controls carried out by the manufacturer.
  • Twice a month, the verification laboratory takes samples of each family of concrete for consistency and compression resistance tests.
  • AENOR continually assesses the production control that the manufacturer records in the software application.

The results are evaluated each year by the Technical Certification Committee which decides whether to maintain or remove the Mark.

Once an organisation passes the certification process, it obtains: ​

  • The AENOR product certificate
  • A licence to use AENOR's Mark of a certified product, in accordance with the provisions of AENOR regulations
AENOR N Mark logo for a certified product​​

GlobalEPD Declarations

Environmental product declarations (EPD)

​​​​AENOR manages the GlobalEPD Programme of verification, in accordance with Standards ISO 14025 and ​EN 15804