EN 14651:2005+A1:2007

Overview

EN 14651:2005+A1:2007 is a European standard developed by CEN that specifies a test method for determining the flexural tensile strength of metallic fibre concrete. The standard is significant for the construction and materials industry, providing a clear and repeatable procedure for assessing both the limit of proportionality (LOP) and the residual flexural tensile strength of concrete containing metallic fibres. This method is suitable for concrete samples with metallic fibres up to 60 mm in length and can also be applied to combinations of metallic and non-metallic fibres.

Compliance with EN 14651 improves the reliability of test results, supports the certification of fibre-reinforced concrete, and contributes to enhanced structural design and quality control in various construction applications.

Key Topics

• Flexural Tensile Strength Measurement: The standard outlines methods for measuring the flexural tensile strength of metallic fibre concrete using moulded prism specimens.
• Limit of Proportionality (LOP): Provides procedures for determining the LOP, which is the initial point where stress and strain are linearly related.
• Residual Flexural Strength: Details the assessment of residual strength values, which indicate the material's capacity to sustain loads after cracking.
• Testing Apparatus and Specimen Preparation:
  • Use of specific testing machines, supporting rollers, loading rollers, and precise transducers.
  • Standardized specimen dimensions and notching requirements.
  • Controlled curing, notching, and handling practices to ensure test consistency.
• Result Expression and Reporting:
  • Methods for recording and presenting load-CMOD (crack mouth opening displacement) or load-deflection data.
  • Requirements for documenting test parameters and outcomes in compliance with the standard.

Applications

EN 14651:2005+A1:2007 is highly relevant to:

• Precast Concrete Manufacturing: Ensures consistent quality assessment of panels, beams, and other products reinforced with metallic fibres.
• Civil Engineering and Construction: Provides reliable procedures for evaluating fibre-reinforced concrete in floors, pavements, tunnel linings, industrial slabs, and shotcrete.
• Quality Control Laboratories: Supplies a benchmark methodology for testing and reporting the mechanical performance of metallic fibre concrete.
• Product Certification and Compliance: Supports manufacturers and suppliers in meeting regulatory and client requirements for concrete products that contain metallic fibres.

By adopting this standard, organizations can demonstrate the structural integrity and durability of their fibre-reinforced concrete products, improving their competitiveness and meeting industry best practices.

Related Standards

For comprehensive quality assessment of concrete, consider reference to these related European standards:

• EN 12390-1: Testing hardened concrete - Part 1: Shape, dimensions, and other requirements for specimens and moulds.
• EN 12390-2: Testing hardened concrete - Part 2: Making and curing specimens for strength tests.
• EN 12390-4: Testing hardened concrete - Part 4: Compressive strength - Specification for testing machines.
• EN 12350-1: Testing fresh concrete - Part 1: Sampling.

Each of these documents provides essential guidance that complements EN 14651, ensuring robust testing and evaluation of both fresh and hardened concrete, including those with fibre reinforcement.

Keywords: EN 14651, metallic fibre concrete, flexural tensile strength, limit of proportionality, residual strength, fibre-reinforced concrete, European standard, concrete test method, quality control, CEN standard.