Introducing GTR
Material classification

GTR comprises two issues [1] :

• Leaflet 1 "General Principles", very useful for understanding the overall methodology;

• Fascicule 2 "Technical appendices", the operational part of the document, containing tables of the technical elements required for project design and implementation.

The guide focuses on three aspects:

• the establishment of a specific classification of materials to meet a pressing need in earthwork construction;

• how the materials are to be used, depending on whether they are to be used for backfill or subgrade;

• practical compaction procedures.

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