ISO 18319-2:2022

Overview

ISO 18319-2:2022 defines specifications for unidirectional carbon fibre‑reinforced polymer (CFRP) strips used as external‑bonded reinforcement on concrete structures. The standard applies to CFRP strips that: consist of carbon fibre and thermoset resin, are manufactured by the pultrusion method, have a carbon‑fibre fraction > 60% by volume, and a thickness ≤ 3 mm. It provides requirements and methods for expressing mechanical properties as characteristic values, appearance and dimensional tolerances, straightness, and sampling tests.

Key topics and requirements

• Scope and materials: Unidirectional CFRP strips with thermoset resin, pultruded manufacture, >60% carbon fibre by volume, thickness within 3 mm.
• Appearance: Strips must be free from visible defects such as cracks, whitening (incomplete curing), and blistering.
• Dimensions & tolerances:
  • Nominal width, thickness, cross‑sectional area and length are agreed between parties.
  • Thickness tolerance: ±10% of nominal.
  • Width and cross‑sectional area shall be no less than nominal (see standard for complete table).
  • Length tolerances vary by nominal length (detailed bands for l ≥ 30 m, 30–10 m, 10–5 m,