Overview - ISO 13270:2013 (Steel fibres for concrete - Definitions and specifications)
ISO 13270:2013 defines terms, classification and technical specifications for steel fibres for concrete used in fibre‑reinforced concrete and mortar. The standard covers fibres for all concrete types - sprayed concrete, flooring, precast, in situ and repair concretes - and can also be applied to steel fibres used in other engineered materials (for example, stainless steel fibres in refractory products). It establishes requirements for dimensions, masses, tolerances, inspection, testing, packing, delivery and storage.
Key topics and technical requirements
- Definitions & symbols: standardized terminology (length, developed length, equivalent diameter, aspect ratio, tensile strength, CMOD, residual flexural strength).
- Classification: steel fibres are grouped by manufacture method:
- Group I: cold‑drawn wire
- Group II: cut sheet
- Group III: melt‑extracted
- Group IV: shaved cold‑drawn wire
- Group V: milled from blocks
- Shape & coating: fibres declared as straight or deformed; coatings (e.g., zinc) must be declared and quantified; passivation recommended for Zn/Zn–Al in alkaline environments.
- Dimensions, masses & tolerances:
- Length, equivalent diameter and aspect ratio must be declared; tolerances and sampling criteria vary by group (typically >90–95% compliance required).
- Measurement accuracies specified (length to 0.1 mm; diameter/width/thickness to 0.01 mm).
- Equivalent diameter for rectangular sections is calculated (d = 4·w·t / π); irregular cross‑sections may use mass and developed length with nominal steel density (≈7850 kg/m3 for carbon steels, ≈7950 kg/m3 for stainless).
- Mechanical properties:
- Tensile strength determined per ISO 6892‑1 (for Groups I & II measured on source wire/plate prior to forming); declared values have defined tolerances (individual and mean).
- Modulus of elasticity, bending behaviour and residual flexural strength are addressed.
- Performance in concrete: mixing behaviour, reinforcing effect, influence on fresh concrete consistency and air content are specified and referenced to test methods (e.g., EN 14845‑2, EN 14651).
- Testing & inspection: Initial Type Tests (ITT), factory production control (FPC), sampling and inspection documentation (per ISO 10474 and related standards).
- Packaging & storage: requirements for packing, marking and storage to preserve fibre quality.
Practical applications and users
Who uses ISO 13270:2013?
- Steel fibre manufacturers - to produce and declare compliant products.
- Concrete producers and technologists - to select fibres with known dimensions and mechanical properties for mix design and quality control.
- Specifiers, engineers and contractors - for procurement and performance specification in sprayed concrete, industrial floors, precast elements, in situ structural and repair works.
- Quality inspectors and testing laboratories - to perform inspection, ITT and FPC in line with the standard.
- Refractory and specialty material engineers - when specifying stainless steel fibres in engineered materials.
Keywords: ISO 13270:2013, steel fibres for concrete, fibre‑reinforced concrete, tensile strength, equivalent diameter, classification, testing, inspection, packaging.
Related standards (examples referenced in ISO 13270)
- ISO 6892‑1 (tensile testing of metallic materials)
- ISO 404 (general technical delivery requirements for steel)
- EN 14651 (metallic fibre concrete flexural testing)
- EN 14845‑2 (test methods for fibres in concrete)
- EN 206‑1 (concrete specification and conformity)
Use ISO 13270:2013 when specifying, producing or verifying steel fibres to ensure consistent performance and compatibility with concrete mixes and construction applications.