Name: ISO 19044:2024 — Test methods for fibre-reinforced cementitious composites — Load-displacement curve using notched specimen
SKU: ISO 19044:2024
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Abstract

Overview

ISO 19044:2024 - Test methods for fibre-reinforced cementitious composites - specifies a standardized three-point bending test using notched prisms to obtain the load–displacement curve of fibre-reinforced cementitious composites (FRCC). The principal aim is to evaluate the tension softening curve of FRCC by measuring crack opening and/or load point displacement during controlled loading. The document is the second edition and updates the 2016 version.

Key topics and technical requirements

Specimen geometry and preparation
- Prisms with square cross-sections: 100 × 100 mm or 150 × 150 mm; overall length ≥ 3.5 D.
- Notch depth = 0.3 D; notch width ≤ 5 mm.
- Minimum six specimens per test series; side tolerances ±0.5%.
- Maximum aggregate size ≤ 1/4 side length; moulds per ISO 1920‑3:2019.
Loading and measurement
- Three-point loading with loading span S = 3 D (±2%).
- Displacement controlled by CMOD (crack mouth opening displacement) and/or LPD (load point displacement); either metric may be selected depending on purpose.
- CMOD/LPD initial rate 0.05 mm/min, may increase to 0.2 mm/min after 0.1 mm displacement.
- Continue until CMOD ≥ 0.04 D or LPD ≥ 0.03 D (longer desirable for large-deformation data).
- Load cell accuracy: ≤1% of estimated peak load. Displacement transducers/clip gauges: 1/500 mm accuracy.
Test equipment and fixtures
- Rotatable loading block/supports to avoid torsion and horizontal restraint; roller-hinged supports advised.
- Knife-edges for CMOD measurement (thickness ≤ 5 mm) if clip gauges cannot attach directly.
- Data acquisition rates: ≥5 Hz during early loading, ≥1 Hz afterward; at least 20 readings before peak load.
Results and reporting
- Average load–displacement curves from at least six specimens.
- Test report must include FRCC composition, fibre type/volume, curing history, specimen geometry, measured curves, and the estimated tension softening curve (method in Annex A).

Applications

Characterizing post-cracking behaviour and tension softening of FRCC for research, material development, and performance specifications.
Quality control and comparison of fibre types/volumes in industrial production of fibre-reinforced mortar or concrete.
Input data for fracture mechanics, structural modeling, and numerical simulations that require calibrated softening laws.

Who should use this standard

Materials and structural laboratories, cement and fibre manufacturers, R&D teams, consulting engineers, and standards bodies involved in testing or specifying FRCC, crack-control solutions, and enhanced cementitious composites.

Related standards

Normative reference: ISO 1920‑3:2019 (making and curing concrete test specimens).
Supersedes: ISO 19044:2016 (this is the second edition, technically revised).

Keywords: ISO 19044:2024, fibre-reinforced cementitious composites, FRCC load-displacement test, notched specimen, tension softening curve, CMOD, LPD, three-point bending.

ISO 19044:2024 PDF

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Abstract

Overview

Key topics and technical requirements

Applications

Who should use this standard

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