2. Materials suitable for processing

2.1 Floors

The soil classes defined by the GTR guide are as follows (cf. ) :

• A: fine soils ;

• B: sandy and gravelly soils with fines ;

• C: soils containing fines and coarse elements ;

• D: water-insensitive soils.

Treatment is indicated for most Class A, B and C soils, under certain conditions (removal of large elements). Class D soils may require treatment with hydraulic binders for use as subgrade.