EN ISO 17892-4:2016 PDF

Overview

EN ISO 17892-4:2016 (CEN adoption of ISO 17892-4:2016) defines laboratory procedures for determining the particle size distribution (PSD) of soil. The standard is part of the ISO 17892 series on laboratory testing of soil and is applicable to geotechnical investigations where PSD is needed for soil classification and engineering assessment. Methods covered include sieving, sedimentation (hydrometer and pipette methods), or a combination of both, depending on soil composition.

Key Topics

• Scope and applicability: Laboratory determination of PSD for geotechnical use; sieving for coarse fractions and sedimentation for fine fractions; combined testing for mixed soils.
• Sieving method: Applicable to non‑cemented soils with particle sizes up to 125 mm; procedures for specimen preparation, apparatus, and fraction reporting.
• Sedimentation methods: Two defined techniques - hydrometer and pipette - for fine-grained material where settling behavior determines particle size.
• Test execution and calculations: Requirements for sample preparation, measurement steps, conversion to equivalent particle diameter, corrections (e.g., for material >2 mm), and derivation of fraction passing each sieve or size limit.
• Quality controls: Calibration, maintenance and checks of apparatus; reporting requirements; guidance on pre-treatment of samples (annexes and informative notes).
• Integration with design codes: The standard fulfills PSD testing requirements referenced by EN 1997‑2 (Eurocode 7).

Applications

EN ISO 17892-4:2016 is used wherever accurate soil grading is needed in geotechnical practice:

• Soil classification for foundation and earthworks design (e.g., determining grain-size curves, D10/D60 indices).
• Site investigation reports prepared by geotechnical consultants and laboratories.
• Design of foundations, slopes, embankments and retaining structures, where PSD affects strength, compressibility and permeability.
• Geohydrological assessments and modeling of seepage or filtration through soils.
• Quality control on construction sites and laboratory accreditation for geotechnical testing.

Typical users include geotechnical engineers, testing laboratories, civil engineering consultants, contractors, researchers and regulatory bodies.

Related Standards (if applicable)

• EN 1997-2 (Eurocode 7) - references for geotechnical investigation requirements (PSD testing compatibility noted).
• Other parts of the ISO 17892 series - complementary laboratory tests on soils (for broader geotechnical laboratory practice).

This standard is essential for consistent, reproducible PSD measurement in geotechnical investigations and for producing defensible soil classification and engineering parameters.