Overview
ISO/TR 18228-5:2025, Design using geosynthetics - Part 5: Stabilization, provides comprehensive guidance for the use of geosynthetics in the stabilization of granular layers in construction. Developed by ISO’s Technical Committee 221, this standard focuses on design principles and practical approaches to using geosynthetics for stabilization in contact with natural soils, fills, asphalt, or other materials. The document addresses the serviceability limit state (SLS) and outlines mechanisms of stabilization, installation considerations, and the interaction between geosynthetics and granular layers, supporting robust infrastructure design for roads, platforms, and foundations.
Key Topics
Applications
The standard’s guidance facilitates the design and construction of robust, stable ground layers for diverse civil engineering projects, including:
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Paved and Unpaved Roads:
- Design of unbound aggregate layers, increasing durability and reducing maintenance costs by controlling deformation and rutting.
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Working Platforms:
- Improvement of bearing capacity and stability for temporary or permanent platforms, such as those used for construction equipment.
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Foundations:
- Enhanced load distribution and settlement control for shallow foundations, embankments, and similar structures on varying subgrades.
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Railways:
- Stabilization of track bed layers to support repetitive loading and maintain track geometry.
In each application, the adoption of geosynthetic stabilization techniques leads to longer lasting structures, lower lifecycle costs, and better management of ground conditions.
Related Standards
When implementing ISO/TR 18228-5:2025, several related ISO standards provide foundational definitions, testing guidance, and broader design frameworks:
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ISO 10318-1: Geosynthetics - Part 1: Terms and definitions
Standard terminology for geosynthetics, providing clarity for specification and compliance.
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ISO/TR 18228 series
Multi-part guidance on geosynthetics in civil engineering, with cross-references for separation, filtration, drainage, and other functions essential to comprehensive ground stabilization.
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Other regional or national standards on unbound road design, pavement testing, and foundation design
For detailed calculation methods, performance assessment, and settlement estimation relevant to specific project requirements.
By following ISO/TR 18228-5:2025, civil engineers, designers, and infrastructure managers can optimize the use of geosynthetics for efficient and reliable stabilization of granular layers. This international technical report supports sustainable, high-performance designs, addressing both practical engineering needs and the long-term resilience of transportation and foundation systems.
