6. Shale utilization
As a preliminary point, it should be remembered that reference should always be made to the recommendations of the GTR guide, supplemented by details given in regional guides, principally that of Nord-Pas-de-Calais (PREDIS), as well as to a number of standards cited in the presentation.
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General conditions of use for coal shale
Fascicule 2 of the GTR defines the general conditions for using class F
31
and F
32
shale in fill and subgrade (tables
7
and
).
These conditions will be specified with reference...
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Shale utilization