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Standard(s): BS EN 14488-7 & BS EN 14721
Polypropylene Fibres

Fibre content testing is an essential procedure used to evaluate the amount and type of fibres present in a concrete mix. The inclusion of fibres enhances the properties of concrete, improving its performance in both its fresh (unhardened) and hardened (in-service) states.

Purpose of Fibre Content Testing

This test ensures that the fibre dosage meets the project’s design requirements, which may influence properties such as:

  • Crack Resistance: Fibres reduce shrinkage cracking in fresh concrete.
  • Durability: Enhanced resistance to wear, impact, and environmental factors.
  • Structural Integrity: Increased tensile strength and load-bearing capacity.

Types of Fibres Commonly Used

  1. Steel Fibres: Provide high tensile strength and ductility.
  2. Polypropylene Fibres: Improve plastic shrinkage resistance and reduce bleeding.
  3. Glass Fibres: Offer resistance to cracking and chemical attack, especially in architectural concrete.

Testing Procedure

Fibre content is determined through a precise methodology:

  1. Sample Selection: A measured and random test sample is taken from the concrete batch, ensuring representative results.
  2. Washing and Sieving: The sample is washed through a sieve to separate the fibres and aggregates from the cementitious matrix.
  3. Separation of Fibres:
    • Steel Fibres: Picked out using a magnet for accuracy.
    • Polypropylene and Glass Fibres: Physically separated based on visual identification.
  4. Weighing the Fibres: The fibres are weighed in their wet state to determine their mass.
  5. Calculating Fibre Density: The fibre content is expressed as kg/m³, providing the dosage rate within the concrete mix.

Applications

Fibre content testing is vital in projects where fibre-reinforced concrete is specified, such as:

  • Industrial floors and pavements
  • Precast concrete elements
  • Shotcrete for tunnels and retaining walls
  • Architectural applications requiring high durability

This testing ensures compliance with design specifications, providing confidence in the concrete’s enhanced performance characteristics.

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Polypropylene Fibres

Fibre content testing is an essential procedure used to evaluate the amount and type of fibres present in a concrete mix. The inclusion of fibres enhances the properties of concrete, improving its performance in both its fresh (unhardened) and hardened (in-service) states.

Purpose of Fibre Content Testing

This test ensures that the fibre dosage meets the project’s design requirements, which may influence properties such as:

  • Crack Resistance: Fibres reduce shrinkage cracking in fresh concrete.
  • Durability: Enhanced resistance to wear, impact, and environmental factors.
  • Structural Integrity: Increased tensile strength and load-bearing capacity.

Types of Fibres Commonly Used

  1. Steel Fibres: Provide high tensile strength and ductility.
  2. Polypropylene Fibres: Improve plastic shrinkage resistance and reduce bleeding.
  3. Glass Fibres: Offer resistance to cracking and chemical attack, especially in architectural concrete.

Testing Procedure

Fibre content is determined through a precise methodology:

  1. Sample Selection: A measured and random test sample is taken from the concrete batch, ensuring representative results.
  2. Washing and Sieving: The sample is washed through a sieve to separate the fibres and aggregates from the cementitious matrix.
  3. Separation of Fibres:
    • Steel Fibres: Picked out using a magnet for accuracy.
    • Polypropylene and Glass Fibres: Physically separated based on visual identification.
  4. Weighing the Fibres: The fibres are weighed in their wet state to determine their mass.
  5. Calculating Fibre Density: The fibre content is expressed as kg/m³, providing the dosage rate within the concrete mix.

Applications

Fibre content testing is vital in projects where fibre-reinforced concrete is specified, such as:

  • Industrial floors and pavements
  • Precast concrete elements
  • Shotcrete for tunnels and retaining walls
  • Architectural applications requiring high durability

This testing ensures compliance with design specifications, providing confidence in the concrete's enhanced performance characteristics.

BS EN 14488-7 & BS EN 14721